<blockquote>textarea是HTML中用于输入多行文本的表单元素，支持通过rows、cols设置初始尺寸，name定义提交字段名，可包含默认文本。2. 常用属性包括placeholder（提示文本）、readonly（只读）、disabled（禁用且不提交）、maxlength（限制字符数）。3. 可通过JavaScript的value属性获取或设置内容，并监听input事件实时响应输入。4. 使用CSS可自定义样式，如宽高、字体、颜色、边框、内边距及resize控制调整方式。5. 实现高度自适应常用JavaScript动态设置height为scrollHeight，或使用第三方库如autosize.js。6. 安全方面需防范XSS攻击，应对用户输入进行验证和HTML实体编码，或启用CSP策略。7. textarea本身仅支持纯文本，富文本编辑需借助富文本编辑器（如CKEditor、Quill），其通常将HTML内容存入隐藏的textarea中提交。</blockquote> <p><img src="https://img.php.cn/upload/article/001/221/864/175516110322064.png" alt="html多行文本框怎么用？textarea标签的作用是什么？"></p> <p>HTML多行文本框，也就是<div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false"><textarea></pre><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div>标签，主要用于收集用户输入的大段文本信息。它和单行文本框<div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false"><input type="text"></pre><div class="contentsignin"></div></div>的<a style="color:#f60; text-decoration:underline;" title="区别" href="https://www.php.cn/zt/27988.html" target="_blank">区别</a>在于，前者可以容纳多行文字，并提供滚动条（在内容超出显示区域时），而后者只能显示单行。</p> <p>textare<a style="color:#f60; text-decoration:underline;" title="a标签" href="https://www.php.cn/zt/60391.html" target="_blank">a标签</a>是HTML表单中一个非常实用的元素，允许用户输入和编辑多行文本。</p> <h3>textarea的基本用法：如何创建和自定义多行文本框？</h3> <p>创建<div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false"><textarea></pre><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div>非常简单，只需要在HTML中添加<div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false"><textarea></pre><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div>标签即可。 默认情况下，它会创建一个可调整大小的文本框。</p><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class=’brush:html;toolbar:false;’><textarea name="message" rows="10" cols="30"> 这里是默认文本。 </textarea></pre><div class="contentsignin"></div></div><ul> <li><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false">name</pre><div class="contentsignin"></div></div><div class="contentsignin"></div></div>属性： 定义提交表单时，文本框数据的名称。</li> <li><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false">rows</pre><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div>属性： 定义文本框的可见行数。 这并不限制用户可以输入的实际行数，只是决定了初始显示的高度。</li> <li><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false">cols</pre><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div>属性： 定义文本框的可见宽度，以字符为单位。 同样，这不限制用户可以输入的字符数，只是影响初始宽度。</li> <li>默认文本： 在<div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false"><textarea></pre><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div>标签内部，你可以放置默认文本，这些文本会在文本框加载时显示。</li> </ul> <p>自定义<div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false"><textarea></pre><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div>，除了<div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false">rows</pre><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div>和<div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false">cols</pre><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div>，还可以通过CSS进行更精细的控制。 比如，你可以设置字体、颜色、边距等等。 关键在于理解<div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false">rows</pre><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div>和<div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false">cols</pre><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div>只是初始尺寸，实际显示效果很大程度上取决于CSS样式。</p> <p><span>立即学习</span>“<a href="https://pan.quark.cn/s/cb6835dc7db1" style="text-decoration: underline !important; color: blue; font-weight: bolder;" rel="nofollow" target="_blank">前端免费学习笔记（深入）</a>”；</p> <h3>textarea的属性详解：如何设置placeholder、readonly和disabled？</h3> <p>除了<div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false">name</pre><div class="contentsignin"></div></div><div class="contentsignin"></div></div>、<div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false">rows</pre><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div>和<div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false">cols</pre><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div>，<div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false"><textarea></pre><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div>还有一些其他常用的属性：</p> <ul> <li> <p><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false">placeholder</pre><div class="contentsignin"></div></div><div class="contentsignin"></div></div>属性： 提供一个提示文本，当文本框为空时显示，用户开始输入时消失。</p><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class=’brush:html;toolbar:false;’><textarea name="message" placeholder="请输入您的留言"></textarea></pre><div class="contentsignin"></div></div></li> <li> <p><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false">readonly</pre><div class="contentsignin"></div></div><div class="contentsignin"></div></div>属性： 将文本框设置为只读，用户无法编辑其中的内容，但可以选中和复制。</p><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class=’brush:html;toolbar:false;’><textarea name="message" readonly>这段文字是只读的。</textarea></pre><div class="contentsignin"></div></div></li> <li> <p><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false">disabled</pre><div class="contentsignin"></div></div><div class="contentsignin"></div></div>属性： 禁用文本框，用户无法编辑或选中其中的内容，并且<a style="color:#f60; text-decoration:underline;" title="表单提交" href="https://www.php.cn/zt/39720.html" target="_blank">表单提交</a>时，该文本框的数据不会被提交。</p><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class=’brush:html;toolbar:false;’><textarea name="message" disabled>这个文本框被禁用了。</textarea></pre><div class="contentsignin"></div></div></li> <li> <p><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false">maxlength</pre><div class="contentsignin"></div></div><div class="contentsignin"></div></div>属性：限制用户可以输入的最大字符数。</p><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class=’brush:html;toolbar:false;’><textarea name="message" maxlength="200"> </textarea></pre><div class="contentsignin"></div></div></li> </ul> <p><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false">placeholder</pre><div class="contentsignin"></div></div><div class="contentsignin"></div></div>用于提供用户友好的提示，<div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false">readonly</pre><div class="contentsignin"></div></div><div class="contentsignin"></div></div>和<div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false">disabled</pre><div class="contentsignin"></div></div><div class="contentsignin"></div></div>用于控制文本框的交互性，<div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false">maxlength</pre><div class="contentsignin"></div></div><div class="contentsignin"></div></div>用于限制输入长度。 它们的应用场景各不相同，根据实际需求选择合适的属性。</p> <h3>textarea的内容处理：如何获取和设置textarea的值？</h3> <p>在JavaScript中，可以通过以下方式获取和设置<div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false"><textarea></pre><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div>的值：</p> <ul> <li> <p><strong>获取值：</strong> 使用<div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false">value</pre><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div>属性。</p><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class=’brush:javascript;toolbar:false;’>const textarea = document.querySelector(‘textarea[name="message"]’); const text = textarea.value; console.log(text);</pre><div class="contentsignin"></div></div></li> <li> <p><strong>设置值：</strong> 同样使用<div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false">value</pre><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div>属性。</p><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class=’brush:javascript;toolbar:false;’>const textarea = document.querySelector(‘textarea[name="message"]’); textarea.value = "新的文本内容";</pre><div class="contentsignin"></div></div></li> </ul> <p>需要注意的是，直接修改<div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false"><textarea></pre><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div>标签内部的文本内容是无效的，必须通过<div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false">value</pre><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div>属性来操作。 此外，还可以监听<div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false">input</pre><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div>或<div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false">change</pre><div class="contentsignin"></div></div>事件，实时获取用户输入的内容。</p> <h3>textarea的样式美化：如何使用CSS定制textarea的外观？</h3> <p>默认的<div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false"><textarea></pre><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div>样式比较朴素，可以通过CSS进行美化。 常见的样式定制包括：</p> <ul> <li><p><strong>尺寸：</strong> 使用<div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false">width</pre><div class="contentsignin"></div></div>和<div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false">height</pre><div class="contentsignin"></div></div><div class="contentsignin"></div></div>属性控制文本框的宽度和高度。 也可以使用<div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false">min-width</pre><div class="contentsignin"></div></div>、<div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false">max-width</pre><div class="contentsignin"></div></div>、<div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false">min-height</pre><div class="contentsignin"></div></div>和<div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false">max-height</pre><div class="contentsignin"></div></div>进行更精细的控制。</p></li> <li><p><strong>字体：</strong> 使用<div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false">font-family</pre><div class="contentsignin"></div></div>、<div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false">font-size</pre><div class="contentsignin"></div></div>、<div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false">font-weight</pre><div class="contentsignin"></div></div>等属性设置字体样式。</p></li> <li><p><strong>颜色：</strong> 使用<div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false">color</pre><div class="contentsignin"></div></div>设置文本颜色，<div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false">background-color</pre><div class="contentsignin"></div></div>设置背景颜色。</p></li> <li><p><strong>边框：</strong> 使用<div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false">border</pre><div class="contentsignin"></div></div>属性设置边框样式。 可以设置边框的宽度、颜色和样式（如实线、虚线等）。</p></li> <li><p><strong>内边距和外边距：</strong> 使用<div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false">padding</pre><div class="contentsignin"></div></div>和<div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false">margin</pre><div class="contentsignin"></div></div>属性调整文本框内容与边框之间的距离，以及文本框与其他元素之间的距离。</p></li> <li> <p><strong>resize属性：</strong> 控制文本框是否允许用户调整大小。 可以设置为<div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false">none</pre><div class="contentsignin"></div></div>、<div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false">both</pre><div class="contentsignin"></div></div>、<div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false">horizontal</pre><div class="contentsignin"></div></div>或<div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false">vertical</pre><div class="contentsignin"></div></div>。</p><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class=’brush:css;toolbar:false;’>textarea { width: 400px; height: 200px; font-family: Arial, sans-serif; font-size: 14px; color: #333; border: 1px solid #ccc; padding: 10px; resize: vertical; /* 允许垂直方向调整大小 */ }</pre><div class="contentsignin"></div></div></li> </ul> <p>更高级的样式定制还可以使用CSS3的特性，比如圆角、阴影、过渡效果等。</p> <h3>textarea的常见问题：如何解决textarea高度自适应问题？</h3> <p><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false"><textarea></pre><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div>的一个常见问题是高度自适应。 默认情况下，当文本内容超出文本框的高度时，会出现滚动条。 但有时我们希望文本框的高度能够根据内容自动调整。</p> <p>实现高度自适应有几种方法：</p> <ol> <li> <p><strong>使用JavaScript监听input事件，动态调整高度：</strong></p><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class=’brush:javascript;toolbar:false;’>const textarea = document.querySelector(‘textarea[name="message"]’); textarea.addEventListener(‘input’, function() { this.style.height = ‘auto’; this.style.height = (this.scrollHeight) + ‘px’; });</pre><div class="contentsignin"></div></div><p>这种方法通过监听<div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false">input</pre><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div>事件，在每次输入时，将<div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false">height</pre><div class="contentsignin"></div></div><div class="contentsignin"></div></div>设置为<div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false">auto</pre><div class="contentsignin"></div></div>，然后再设置为<div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false">scrollHeight</pre><div class="contentsignin"></div></div><div class="contentsignin"></div></div>，从而实现高度自适应。</p> </li> <li> <p><strong>使用CSS的<div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false">overflow: hidden</pre><div class="contentsignin"></div></div>和<div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false">height: auto</pre><div class="contentsignin"></div></div>：</strong></p> <p>这种方法依赖于<a style="color:#f60; text-decoration:underline;" title="浏览器" href="https://www.php.cn/zt/16180.html" target="_blank">浏览器</a>对<div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false">scrollHeight</pre><div class="contentsignin"></div></div><div class="contentsignin"></div></div>的正确计算，可能在某些情况下表现不佳。</p> </li> <li> <p><strong>使用第三方库：</strong></p> <p>有一些第三方库专门用于解决<div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false"><textarea></pre><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div>的高度自适应问题，比如autosize.js。 它们通常提供了更稳定和更强大的功能。</p> </li> </ol> <p>选择哪种方法取决于具体的需求和项目的复杂度。 对于简单的场景，可以使用JavaScript监听<div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false">input</pre><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div>事件。 对于复杂的场景，可以考虑使用第三方库。</p> <h3>textarea的安全问题：如何防止XSS攻击？</h3> <p>在使用<div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false"><textarea></pre><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div>时，需要注意安全问题，特别是XSS（跨站脚本攻击）。 如果用户输入的内容未经处理直接输出到页面上，可能会导致恶意脚本被执行。</p> <p>防止XSS攻击的方法包括：</p> <ul> <li><p><strong>输入验证：</strong> 对用户输入的内容进行验证，过滤掉潜在的恶意代码。 可以使用正则表达式或其他方法进行验证。</p></li> <li> <p><strong>输出编码：</strong> 在将用户输入的内容输出到页面上时，进行HTML编码。 将特殊字符（如<div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false"><</pre><div class="contentsignin"></div></div>、<div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false">></pre><div class="contentsignin"></div></div>、<div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false">"</pre><div class="contentsignin"></div></div>、<div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false">'</pre><div class="contentsignin"></div></div>等）转换为HTML实体。</p><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class=’brush:javascript;toolbar:false;’>function escapeHtml(text) { var map = { ‘&’: ‘&’, ‘<‘: ‘<‘, ‘>’: ‘>’, ‘"’: ‘"’, "’": ‘'’ }; return text.replace(/[&<>"’]/g, function(m) { return map[m]; }); } const userInput = textarea.value; const escapedInput = escapeHtml(userInput); // 将escapedInput输出到页面上</pre><div class="contentsignin"></div></div></li> <li><p><strong>使用CSP（内容安全策略）：</strong> CSP是一种安全机制，可以限制浏览器加载和执行哪些资源。 通过配置CSP，可以有效地防止XSS攻击。</p></li> </ul> <p>安全问题不容忽视，务必采取必要的措施，保护用户和网站的安全。</p> <h3>textarea与富文本编辑器：textarea能实现富文本编辑吗？</h3> <p><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false"><textarea></pre><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div>本身只能用于输入和编辑纯文本。 如果需要实现富文本编辑，需要借助富文本编辑器。</p> <p>富文本编辑器是一种可以编辑带有样式的文本的<a style="color:#f60; text-decoration:underline;" title="工具" href="https://www.php.cn/zt/16887.html" target="_blank">工具</a>。 它可以让用户设置字体、颜色、大小、段落格式、插入图片和链接等。</p> <p>富文本编辑器的实现方式通常是：</p> <ol> <li>使用一个<div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false"><iframe></pre><div class="contentsignin"></div></div><div class="contentsignin"></div></div>元素，并将<div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false">designMode</pre><div class="contentsignin"></div></div>属性设置为<div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false">on</pre><div class="contentsignin"></div></div>。 这样就可以在<div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false"><iframe></pre><div class="contentsignin"></div></div><div class="contentsignin"></div></div>中编辑带有样式的文本。</li> <li>使用JavaScript库，如CKEditor、TinyMCE、Quill等。 这些库提供了丰富的API和功能，可以方便地实现富文本编辑。</li> </ol> <p><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false"><textarea></pre><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div>通常作为富文本编辑器的底层文本容器，用于存储和提交用户编辑的内容。 富文本编辑器会将用户编辑的内容转换为HTML代码，然后存储到<div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false"><textarea></pre><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div>中。</p> <p>总而言之，<div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false"><textarea></pre><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div>是HTML中用于输入和编辑多行文本的基本元素。 掌握<div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false"><textarea></pre><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div>的用法和属性，以及相关的CSS样式和JavaScript操作，对于构建Web表单和用户界面至关重要。 同时，也要注意安全问题，防止XSS攻击。 如果需要实现富文本编辑，需要借助富文本编辑器。</p>
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