浅谈nodeName,nodeValue,nodeType,typeof 的区别

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下面提供一份完整的攻略,以便你进行参考。

背景

在JavaScript中,有时需要处理HTML或XML文档中的节点,这些节点拥有如节点类型(NodeType)、节点名称(nodeName)、节点值(nodeValue)、数据类型(typeof)等关键词。它们有各自特殊的用途和区别。本文将深入浅出地讨论它们之间的联系和差异。

节点类型(NodeType)

在处理 HTML 或 XML 文档时,这是最常用到的节点属性。 通常,节点类型是一个整数,用于表示节点的类型。 不同类型的节点用不同的值表示,例如元素节点为 1,属性节点为 2,文本节点为 3,注释节点为 8。

示例说明

我们可以使用以下代码获取节点类型,例如:

var nodeType = document.getElementsByTagName('body')[0].nodeType;
console.log(nodeType);

执行结果将返回1, 表示是元素节点.

节点名称(nodeName)

节点名称是一个只读属性,返回节点的名称。 对于 HTML 元素节点, 其节点名称是它的标签名称。 对于其他的节点, 它的节点名称可以使用

示例说明

我们可以使用以下代码获取节点名称,例如:

var nodeName = document.getElementsByTagName('body')[0].nodeName;
console.log(nodeName);

执行结果将返回BODY,这是HTML元素节点的标签名称。

节点值(nodeValue)

节点值是一个只读属性,返回节点的值。 对于不同类型的节点,其节点值不同。 对于文本节点,其值即为文本内容; 对于其他节点类型,其值可能为空或 undefined。

示例说明

我们可以使用以下代码获取节点值,例如:

var nodeValue = document.getElementsByTagName('title')[0].nodeValue;
console.log(nodeValue);

执行结果将返回标签内的文本内容。</p> <h2>数据类型(typeof)</h2> <p>数据类型是指变量的类型, 它不同于节点的属性。 枚举数据类型有: "number", "string", "boolean", "null", "undefined", "symbol", "object", "function"等。 </p> <h3>示例说明</h3> <p>我们可以使用以下代码检查数据类型,例如: </p> <pre><code class="language-javascript">var element = document.getElementById('myElement'); var nodeType = element.nodeType; // 节点类型 var nodeName = element.nodeName; // 节点名称 var nodeValue = element.nodeValue; // 节点值 console.log('节点类型: ' + typeof nodeType); console.log('节点名称: ' + typeof nodeName); console.log('节点值: ' + typeof nodeValue); </code></pre> <p>执行结果将返回: </p> <pre><code>节点类型: number 节点名称: string 节点值: undefined </code></pre> <h2>结论</h2> <p>以上是有关 nodeName, nodeValue, nodeType 和 typeof 之间联系和区别的完整攻略。 我们深入理解和熟练使用这些关键词,可以在JavaScript中更好地处理HTML和XML中节点相关的问题。</p> <div class="entry-readmore"><div class="entry-readmore-btn"></div></div> <div class="entry-copyright"><p>本站文章如无特殊说明,均为本站原创,如若转载,请注明出处:<a href="https://pythonjishu.com/atynnsrwrdyexyr/">浅谈nodeName,nodeValue,nodeType,typeof 的区别 - Python技术站</a></p></div> </div> <div class="entry-tag"><a href="https://pythonjishu.com/tag/node-js/" rel="tag">node js</a></div> <div class="entry-action"> <div class="btn-zan" data-id="304766"><i class="wpcom-icon wi"><svg aria-hidden="true"><use xlink:href="#wi-thumb-up-fill"></use></svg></i> 赞 <span class="entry-action-num">(0)</span></div> </div> <div class="entry-bar"> <div class="entry-bar-inner"> <div class="entry-bar-info entry-bar-info2"> <div class="info-item meta"> <a class="meta-item j-heart" href="javascript:;" data-id="304766"><i class="wpcom-icon wi"><svg aria-hidden="true"><use xlink:href="#wi-star"></use></svg></i> <span class="data">0</span></a> <a class="meta-item" href="#comments"><i class="wpcom-icon wi"><svg aria-hidden="true"><use xlink:href="#wi-comment"></use></svg></i> <span class="data">0</span></a> <a class="meta-item dashang" href="javascript:;"> <i class="wpcom-icon wi"><svg aria-hidden="true"><use xlink:href="#wi-cny-circle-fill"></use></svg></i> 打赏 <span class="dashang-img dashang-img2"> <span> <img src="//pythonjishu.com/wp-content/uploads/2023/02/2023-02-06_10-34-29.jpg" alt="微信扫一扫"/> 微信扫一扫 </span> <span> <img src="//pythonjishu.com/wp-content/uploads/2023/02/2023-02-06_10-35-01.jpg" alt="支付宝扫一扫"/> 支付宝扫一扫 </span> </span> </a> </div> <div class="info-item share"> <a class="meta-item mobile j-mobile-share" href="javascript:;" data-id="304766" data-qrcode="https://pythonjishu.com/atynnsrwrdyexyr/"><i class="wpcom-icon wi"><svg aria-hidden="true"><use xlink:href="#wi-share"></use></svg></i> 生成海报</a> <a class="meta-item wechat" data-share="wechat" target="_blank" rel="nofollow" href="#"> <i class="wpcom-icon wi"><svg aria-hidden="true"><use xlink:href="#wi-wechat"></use></svg></i> </a> <a class="meta-item weibo" data-share="weibo" target="_blank" rel="nofollow" href="#"> <i class="wpcom-icon wi"><svg aria-hidden="true"><use xlink:href="#wi-weibo"></use></svg></i> </a> <a class="meta-item qq" data-share="qq" target="_blank" rel="nofollow" href="#"> <i class="wpcom-icon wi"><svg aria-hidden="true"><use xlink:href="#wi-qq"></use></svg></i> </a> <a class="meta-item qzone" data-share="qzone" target="_blank" rel="nofollow" href="#"> <i class="wpcom-icon wi"><svg aria-hidden="true"><use xlink:href="#wi-qzone"></use></svg></i> </a> </div> <div class="info-item act"> <a href="javascript:;" id="j-reading"><i class="wpcom-icon wi"><svg aria-hidden="true"><use xlink:href="#wi-article"></use></svg></i></a> </div> </div> </div> </div> </div> <div class="entry-page"> <div class="entry-page-prev entry-page-nobg"> <a href="https://pythonjishu.com/jssqkysirnyyozs/" title="Nodejs中Express 常用中间件 body-parser 实现解析" rel="prev"> <span>Nodejs中Express 常用中间件 body-parser 实现解析</span> </a> <div class="entry-page-info"> <span class="pull-left"><i class="wpcom-icon wi"><svg aria-hidden="true"><use xlink:href="#wi-arrow-left-double"></use></svg></i> 上一篇</span> <span class="pull-right">2023年6月8日</span> </div> </div> <div class="entry-page-next entry-page-nobg"> <a href="https://pythonjishu.com/okvbksrraftmnjg/" title="node+axios实现服务端文件上传示例" rel="next"> <span>node+axios实现服务端文件上传示例</span> </a> <div class="entry-page-info"> <span class="pull-right">下一篇 <i class="wpcom-icon wi"><svg aria-hidden="true"><use xlink:href="#wi-arrow-right-double"></use></svg></i></span> <span class="pull-left">2023年6月8日</span> </div> </div> </div> <div class="entry-related-posts"> <h3 class="entry-related-title">相关文章</h3><ul class="entry-related cols-3 post-loop post-loop-default"><li class="item item-no-thumb"> <div class="item-content"> <h3 class="item-title"> <a href="https://pythonjishu.com/pchyigkbpyhiywj/" rel="bookmark"> koa-compose简单实现及使用的妙处 </a> </h3> <div class="item-excerpt"> <p>我很乐意为您讲解“koa-compose简单实现及使用的妙处”的完整攻略。 什么是koa-compose? 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