获取节点

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更新时间2025-07-30

定位节点

改变节点

获取元素的值

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。

如需获得元素的文本值，您必须检索元素的文本节点的值。

也就是说，获取元素文本的方法，就是获取这个子节点（文本节点）的值。

getElementsByTagName 方法

getElementsByTagName() 方法返回包含拥有指定标签名的所有元素的节点列表，其中的元素的顺序是它们在源文档中出现的顺序。

假设 books.xml 已加载到 xmlDoc 中。

此代码检索第一个元素：</p> <pre class="language-js"> var x = xmlDoc.getElementsByTagName("title")[0]; </pre> <section> <h2>ChildNodes 属性</h2> <p><code>childNodes</code> 属性返回<em>元素的子节点的列表</em>。</p> <p>下面的代码检索第一个 <title> 元素的文本节点：</p> <pre class="language-js"> x = xmlDoc.getElementsByTagName("title")[0]; y = x.childNodes[0]; </pre> <section> <h2>nodeValue 属性</h2> <p><code>nodeValue</code> 属性返回<em>文本节点的文本值</em>。</p> <p>下面的代码检索第一个 <title> 元素的文本节点的文本值：</p> <h3>实例</h3> <pre class="language-js"> x = xmlDoc.getElementsByTagName("title")[0]; y = x.childNodes[0]; z = y.nodeValue; </pre> <p>z 中的结果：雅舍谈吃</p> <section> <h2>完整实例</h2> <h3>例子 1</h3> <pre class="language-js"> <!DOCTYPE html> <html> <body> <p id="demo"></p> <script> var xhttp = new XMLHttpRequest(); xhttp.onreadystatechange = function() { if (this.readyState == 4 && this.status == 200) { myFunction(this); } }; xhttp.open("GET", "books.xml", true); xhttp.send(); function myFunction(xml) { var xmlDoc = xml.responseXML; <mark>var x = xmlDoc.getElementsByTagName('title')[0];</mark> <mark>var y = x.childNodes[0];</mark> document.getElementById("demo").innerHTML = y.nodeValue; } </script> </body> </html> </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> <h3>例子 2</h3> <p>循环遍历所有 <title> 元素：</p> <pre class="language-js"> x = xmlDoc.getElementsByTagName('title'); for (i = 0; i < x.length; i++) { txt += x[i].childNodes[0].nodeValue + "<br>"; } </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>获取属性的值</h2> <p>在 DOM 中，属性也是节点。与元素节点不同的是，属性节点有文本值。</p> <p>获取属性值的方法是获取其文本值。</p> <p>可以通过使用 <code>getAttribute()</code> 方法或属性节点的 <code>nodeValue</code> 属性来完成这个任务。</p> <section> <h2>获取属性值 - getAttribute()</h2> <p><code>getAttribute()</code> 方法返回<em>属性的值</em>。</p> <p>下面的代码检索第一个 <title> 元素的 <code>"lang"</code> 属性的文本值：</p> <h3>例子 1</h3> <pre class="language-js"> x = xmlDoc.getElementsByTagName("title")[0]; txt = x.getAttribute("lang"); </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> <h3>例子 2</h3> <p>循环遍历所有 <book> 元素并获取它们的 "category" 属性：</p> <pre class="language-js"> x = xmlDoc.getElementsByTagName("book"); for (i = 0; i < x.length; i++) { txt += x[i].getAttribute("category") + "<br>"; } </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>获取属性值 - getAttributeNode()</h2> <p><code>getAttributeNode()</code> 方法返回<em>属性节点</em>。</p> <p>下面的代码检索第一个 <title> 元素的 <code>"lang"</code> 属性的文本值：</p> <h3>例子 1</h3> <pre class="language-js"> x = xmlDoc.getElementsByTagName("title")[0]; y = x.getAttributeNode("lang"); txt = y.nodeValue; </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> <h3>例子 2</h3> <p>循环遍历所有 <book> 元素并获取它们的 "category" 属性：</p> <pre class="language-js"> x = xmlDoc.getElementsByTagName("book"); for (i = 0; i < x.length; i++) { txt += x[i].getAttributeNode("category").nodeValue + "<br>"; } </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> </div> <div class="desadown flexRow"> <a href="/xml/xml-dom-nodes-navigate.html" title="定位节点" class="dsdleft flexRow dsda"> <img src="/static/lhimages/icon226.png" class="nocheck"> <img src="/static/lhimages/icon226_check.png" class="check"> <p>定位节点</p> </a> <a href="/xml/xml-dom-nodes-set.html" title="改变节点" class="dsdright flexRow dsda"><p>改变节点</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 codevideo"> <div class="codevideo-tab flexColumn"> <div class="vtaba-free"> <p>免费</p> </div> <a 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