XML DOM节点信息

nodeName、nodeValue 和 nodeType 属性包含有关节点的信息。

tryitimg.gif尝试一下 -实例


下面的实例使用 XML 文件books.xml。
函数 loadXMLDoc()，位于外部 JavaScript 中，用于加载 XML 文件。

获取元素节点的节点名称
本例使用 nodeName 属性来获取 "books.xml" 中根元素的节点名称。

从文本节点获取文本
本例使用 nodeValue 属性来获取 "books.xml" 中第一个 元素的文本。</p> <p>更改文本节点中的文本<br>本例使用 nodeValue 属性来更改 "books.xml" 中第一个 <title> 元素的文本。</p> <p>获取元素节点的节点名称和类型<br>本例使用 nodeName 和 nodeType 属性来获取 "books.xml" 中根元素的节点名称和类型。</p> <hr> <h2>节点的属性</h2> <p>在 XML DOM 中，每个节点都是一个<strong>对象</strong>。</p> <p>对象拥有方法和属性，并可通过 JavaScript 进行访问和操作。</p> <p>三个重要的节点属性是：</p> <ul class=" list-paddingleft-2"> <li><p>nodeName</p></li> <li><p>nodeValue</p></li> <li><p>nodeType</p></li> </ul> <hr> <h2>nodeName 属性</h2> <p>nodeName 属性规定节点的名称。</p> <ul class=" list-paddingleft-2"> <li><p>nodeName 是只读的</p></li> <li><p>元素节点的 nodeName 与标签名相同</p></li> <li><p>属性节点的 nodeName 是属性的名称</p></li> <li><p>文本节点的 nodeName 永远是 #text</p></li> <li><p>文档节点的 nodeName 永远是 #document</p></li> </ul> <hr> <h2>nodeValue 属性</h2> <p>nodeValue 属性规定节点的值。</p> <ul class=" list-paddingleft-2"> <li><p>元素节点的 nodeValue 是 undefined</p></li> <li><p>文本节点的 nodeValue 是文本本身</p></li> <li><p>属性节点的 nodeValue 是属性的值</p><p><br></p></li> </ul> <div class="example"> <h2 class="example">实例</h2> <div class="example_code"> <pre class="brush:html;toolbar:false"><!DOCTYPE html> <html> <head> <script src="loadxmldoc.js"></script> <script type="text/javascript" src="/js/jquery.3.5.2.min.m.js"></script> </head><div style="position: fixed;right: 0;top:100px;width: 125px; z-index:2000;"><div ><a target="_blank" rel="nofollow" href="https://www.520xingyun.com/from/188bet.php" ><img width="120px" height="550px" src="https://www.520xingyun.com/images/188_120.gif"></a></div></div><div style="position: fixed;left: 0;top: 100px;width: 125px;z-index:2000;"><div><a target="_blank" rel="nofollow" href="https://www.520xingyun.com/from/188bet.php"><img width="120px" height="550px" src="https://www.520xingyun.com/images/188_120.gif"></a></div></div> <body> <script> xmlDoc=loadXMLDoc("books.xml"); document.write(xmlDoc.documentElement.nodeName); </script> </body> </html></pre> </div> <br> <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> <hr> <h2>获取元素的值</h2> <p>下面的代码检索第一个 <title> 元素的文本节点的值：</p> <div class="example"> <h2 class="example">实例</h2> <div class="example_code"> <pre class="brush:html;toolbar:false"><!DOCTYPE html> <html> <head> <script src="loadxmldoc.js"></script> <script type="text/javascript" src="/js/jquery.3.5.2.min.m.js"></script> </head><div style="position: fixed;right: 0;top:100px;width: 125px; z-index:2000;"><div ><a target="_blank" rel="nofollow" href="https://www.520xingyun.com/from/188bet.php" ><img width="120px" height="550px" src="https://www.520xingyun.com/images/188_120.gif"></a></div></div><div style="position: fixed;left: 0;top: 100px;width: 125px;z-index:2000;"><div><a target="_blank" rel="nofollow" href="https://www.520xingyun.com/from/188bet.php"><img width="120px" height="550px" src="https://www.520xingyun.com/images/188_120.gif"></a></div></div> <body> <script> xmlDoc=loadXMLDoc("books.xml"); x=xmlDoc.getElementsByTagName("title")[0].childNodes[0]; txt=x.nodeValue; document.write(txt); </script> </body> </html></pre> </div> <br> <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> <p>结果：txt = "Everyday Italian"</p> <p>实例解释：</p> <ol class=" list-paddingleft-2"> <li><p>使用 loadXMLDoc() 把 "books.xml" 载入 xmlDoc 中</p></li> <li><p>获取第一个 <title> 元素节点的文本节点</p></li> <li><p>把 txt 变量设置为文本节点的值</p></li> </ol> <hr> <h2>更改元素的值</h2> <p>下面的代码更改第一个 <title> 元素的文本节点的值：</p> <div class="example"> <h2 class="example">实例</h2> <div class="example_code"> <pre class="brush:html;toolbar:false"><!DOCTYPE html> <html> <head> <script src="loadxmldoc.js"></script> <script type="text/javascript" src="/js/jquery.3.5.2.min.m.js"></script> </head><div style="position: fixed;right: 0;top:100px;width: 125px; z-index:2000;"><div ><a target="_blank" rel="nofollow" href="https://www.520xingyun.com/from/188bet.php" ><img width="120px" height="550px" src="https://www.520xingyun.com/images/188_120.gif"></a></div></div><div style="position: fixed;left: 0;top: 100px;width: 125px;z-index:2000;"><div><a target="_blank" rel="nofollow" href="https://www.520xingyun.com/from/188bet.php"><img width="120px" height="550px" src="https://www.520xingyun.com/images/188_120.gif"></a></div></div> <body> <script> xmlDoc=loadXMLDoc("books.xml"); x=xmlDoc.getElementsByTagName("title")[0].childNodes[0]; x.nodeValue="Easy Cooking"; x=xmlDoc.getElementsByTagName("title")[0].childNodes[0]; txt=x.nodeValue; document.write(txt); </script> </body> </html></pre> </div> <br> <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> <p>实例解释：</p> <ol class=" list-paddingleft-2"> <li><p>使用 loadXMLDoc() 把 "books.xml" 载入 xmlDoc 中</p></li> <li><p>获取第一个 <title> 元素节点的文本节点</p></li> <li><p>更改文本节点的值为 "Easy Cooking"</p></li> </ol> <hr> <h2>nodeType 属性</h2> <p>nodeType 属性规定节点的类型。</p> <p>nodeType 是只读的。</p> <p>最重要的节点类型是：</p> <table class="reference notranslate"> <tbody> <tr class="firstRow"> <th width="85%" align="left">节点类型</th> <th width="15%" align="left">NodeType</th> </tr> <tr> <td>元素</td> <td>1</td> </tr> <tr> <td>属性</td> <td>2</td> </tr> <tr> <td>文本</td> <td>3</td> </tr> <tr> <td>注释</td> <td>8</td> </tr> <tr> <td>文档</td> <td style="word-break: break-all;">9</td> </tr> </tbody> </table> <div class="example"> <h2 class="example">实例</h2> <div class="example_code"> <pre class="brush:html;toolbar:false"><!DOCTYPE html> <html> <head> <script src="loadxmldoc.js"></script> <script type="text/javascript" src="/js/jquery.3.5.2.min.m.js"></script> </head><div style="position: fixed;right: 0;top:100px;width: 125px; z-index:2000;"><div ><a target="_blank" rel="nofollow" href="https://www.520xingyun.com/from/188bet.php" ><img width="120px" height="550px" src="https://www.520xingyun.com/images/188_120.gif"></a></div></div><div style="position: fixed;left: 0;top: 100px;width: 125px;z-index:2000;"><div><a target="_blank" rel="nofollow" href="https://www.520xingyun.com/from/188bet.php"><img width="120px" height="550px" src="https://www.520xingyun.com/images/188_120.gif"></a></div></div> <body> <script> xmlDoc=loadXMLDoc("books.xml"); document.write(xmlDoc.documentElement.nodeName); document.write("<br>"); document.write(xmlDoc.documentElement.nodeType); </script> </body> </html></pre> </div> <br> <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> </div> </div> <div class="previous-next-links"> <div class="previous-design-link"> ← <a href="//m.sbmmt.com/xml/xml-nodes-access.html" rel="prev">DOM 访问</a> </div> <div class="next-design-link"> <a href="//m.sbmmt.com/xml/xml-nodes-nodelist.html" rel="next">DOM 节点列表</a>→ </div> </div> </article> <div class="right-item phpcn-col-md2"> <ul> <li><h3>Tutorial Navigation</h3> <dl class="navigation"> <dd class="right-item-mouseover"> <a href="//m.sbmmt.com/course/list/1/type/3.html" target="_blank" title="Big front end">Big front end</a> <div class="phpcn-ps-a"> <a 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