改变节点

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更新时间2025-07-30

获取节点

删除节点

改变元素的值

在 DOM 中，一切都是节点。元素节点没有文本值。

元素节点的文本值存储在子节点中。该节点被称为文本节点。

如需更改元素的文本值，必须更改元素的文本节点的值。

改变文本节点的值

nodeValue 属性可用于更改文本节点的值。

下面的代码更改第一个元素的文本节点值：</p> <h3>例子 1</h3> <pre class="language-js"> xmlDoc.getElementsByTagName("title")[0].childNodes[0].nodeValue = "潮菜天下" </pre> <a target="_blank" href="#" class="showbtn codebtn">运行实例 »</a><p>点击 "运行实例" 按钮查看在线实例</p> <h4>例子解释：</h4> <ol> <li>假设 books.xml 被加载到 <code>xmlDoc</code> 中</li> <li>获取 <title> 元素的第一个子节点</li> <li>把此文本节点的节点值更改为 "潮菜天下"</li> </ol> <h3>例子 2</h3> <p>循环并更改所有 <title> 元素的文本节点：</p> <pre class="language-js"> for (i = 0; i < x.length; i++) { x[i].childNodes[0].nodeValue = "已更改的文本"; } </pre> <a target="_blank" href="#" class="showbtn codebtn">运行实例 »</a><p>点击 "运行实例" 按钮查看在线实例</p> <section> <h2>改变属性的值</h2> <p>在 DOM 中，属性也是节点。与元素节点不同的是，属性节点拥有文本值。</p> <p>更改属性值的方法是更改其文本值。</p> <p>可以通过使用 <code>setAttribute()</code> 方法或属性节点的 <code>nodeValue</code> 属性来完成这个任务。</p> <section> <h2>使用 setAttribute() 改变属性</h2> <p><code>setAttribute()</code> 方法<em>设置已有属性的值</em>，或<em>创建新属性</em>。</p> <p><code>setAttribute()</code> 方法可更改属性的值。如果该属性不存在，则创建一个新属性。</p> <p>这段代码更改 <book> 元素的 category 属性：</p> <h3>例子 1</h3> <pre class="language-js"> xmlDoc.getElementsByTagName("book")[0].setAttribute("category","烹饪"); </pre> <a target="_blank" href="#" class="showbtn codebtn">运行实例 »</a><p>点击 "运行实例" 按钮查看在线实例</p> <h4>例子解释：</h4> <ol> <li>假设 books.xml 已被加载到 <code>xmlDoc</code> 中</li> <li>获取第一个 <book> 元素</li> <li>将 "category" 属性的值更改为 "烹饪"</li> </ol> <h3>例子 2</h3> <p>循环遍历所有 <title> 元素并添加新属性：</p> <pre class="language-js"> x = xmlDoc.getElementsByTagName('title'); for (i = 0; i < x.length; i++) { x[i].setAttribute("edition","第一版"); } </pre> <a target="_blank" href="#" class="showbtn codebtn">运行实例 »</a><p>点击 "运行实例" 按钮查看在线实例</p> <p class="important"><span>注意：</span>如果该属性不存在，则会创建一个新属性（带有指定的名称和值）。</p> <section> <h2>使用 nodeValue 改变属性</h2> <p><code>nodeValue</code> 属性是<em>属性节点的值</em>。</p> <p>更改 <code>nodeValue</code> 属性可更改属性的值。</p> <h3>实例</h3> <pre class="language-js"> xmlDoc.getElementsByTagName("book")[0].getAttributeNode("category").nodeValue = "烹饪"; </pre> <a target="_blank" href="#" class="showbtn codebtn">运行实例 »</a><p>点击 "运行实例" 按钮查看在线实例</p> <h4>例子解释：</h4> <ol> <li>假设 books.xml 已被加载到 <code>xmlDoc</code> 中</li> <li>获取第一个 <book> 元素的 "category" 属性</li> <li>将属性节点的值更改为 "烹饪"</li> </ol> </div> <div class="desadown flexRow"> <a href="/xml/xml-dom-nodes-get.html" title="获取节点" class="dsdleft flexRow dsda"> <img src="/static/lhimages/icon226.png" class="nocheck"> <img src="/static/lhimages/icon226_check.png" class="check"> <p>获取节点</p> </a> <a href="/xml/xml-dom-nodes-remove.html" title="删除节点" class="dsdright flexRow dsda"><p>删除节点</p> <img src="/static/lhimages/icon227.png" class="nocheck"> <img src="/static/lhimages/icon227_check.png" class="check"> </a> </div> </div> <div class="left-video"> <div class="ltzt-title lttitle flexRow"> <div class="title-left flexRow"> <p><span>相关</span><b></b></p> <p>视频</p> <p class="eng">RELATED VIDEOS</p> </div> <a class="title-more flexRow" href="/course/sort_new.html" title="视频教程"><b></b>更多 </a> </div> <div class="video-list flexRow 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