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HTMLDOM入门级知识手册

HTML DOM定义了访问和操作HTML文档的标准方法。HTML DOM 把HTML文档呈现为带有元素、属性和文本的树结构(节点树)。

推荐阅读:大话HTML DOM与XML DOM的区别与联系

HTML DOM简介

HTML文档对象模型(HTML Document Object Model)定义了访问和处理HTML文档的标准方法。

您应当具备的基础知识

在继续学习之前,您需要对下面的知识有基本的了解:

◆HTML / XHTML

◆JavaScript

什么是DOM?

通过JavaScript,您可以重构整个HTML文档。您可以添加、移除、改变或重排页面上的项目。要改变页面的某个东西,JavaScript就需要对HTML文档中所有元素进行访问的入口。这个入口,连同对HTML元素进行添加、移动、改变或移除的方法和属性,都是通过文档对象模型来获得的(DOM)。

在1998年,W3C发布了***级的DOM规范。这个规范允许访问和操作HTML页面中的每一个单独的元素。所有的浏览器都执行了这个标准,因此,DOM的兼容性问题也几乎难觅踪影了。DOM可被JavaScript用来读取、改变HTML、XHTML以及XML文档。DOM被分为不同的部分(核心、XML及HTML)和级别(DOM Level 1/2/3):

◆Core DOM:定义了一套标准的针对任何结构化文档的对象。

◆XML DOM:定义了一套标准的针对XML文档的对象。

◆HTML DOM:定义了一套标准的针对HTML文档的对象。

HTML DOM 节点

HTML文档中的每个成分都是一个节点。

节点

根据DOM,HTML文档中的每个成分都是一个节点。DOM是这样规定的:

◆整个文档是一个文档节点

◆每个HTML标签是一个元素节点

◆包含在HTML元素中的文本是文本节点

◆每一个HTML属性是一个属性节点

◆注释属于注释节点

Node层次

节点彼此都有等级关系。HTML文档中的所有节点组成了一个文档树(或节点树)。HTML文档中的每个元素、属性、文本等都代表着树中的一个节点。树起始于文档节点,并由此继续伸出枝条,直到处于这棵树***级别的所有文本节点为止。下面这个图片表示一个文档树(节点树):

HTML DOM 节点树

一棵节点树中的所有节点彼此都是有关系的。

文档树(节点数)

 
 
 
  1. 请看下面这个HTML文档:  
  2.  
  3.    
  4.     DOM Tutorial   
  5.      
  6.      
  7.     

    DOM Lesson one

       
  8.     

    Hello world!

       
  9.      
  10.  

上面所有的节点彼此间都存在关系。除文档节点之外的每个节点都有父节点。举例, 和 的父节点是节点,文本节点"Hello world!"的父节点是

节点。

大部分元素节点都有子节点。比方说,节点有一个子节点:节点。<title>节点也有一个子节点:文本节点"DOM Tutorial"。当节点分享同一个父节点时,它们就是同辈(同级节点)。比方说,<h1>和 <p>是同辈,因为它们的父节点均是<body>节点。</p><p>节点也可以拥有后代,后代指某个节点的所有子节点,或者这些子节点的子节点,以此类推。比方说,所有的文本节点都是<html>节点的后代,而***个文本节点是<head>节点的后代。节点也可以拥有先辈。先辈是某个节点的父节点,或者父节点的父节点,以此类推。比方说,所有的文本节点都可把<html>节点作为先辈节点。</p><p>#p#</p><p><strong>HTML DOM访问节点</strong></p><p>通过DOM,您可访问HTML文档中的每个节点。</p><p><strong>查找并访问节点</strong></p><p>你可通过若干种方法来查找您希望操作的元素:</p><p>◆通过使用 getElementById() 和 getElementsByTagName() 方法。</p><p>◆通过使用一个元素节点的parentNode、firstChild以及lastChild属性。</p><p><strong>getElementById() 和 getElementsByTagName()</strong></p><p>getElementById() 和 getElementsByTagName()这两种方法,可查找整个HTML文档中的任何HTML元素。</p><p>这两种方法会忽略文档的结构。假如您希望查找文档中所有的<p>元素,getElementsByTagName()会把它们全部找到,不管<p>元素处于文档中的哪个层次。同时,getElementById()方法也会返回正确的元素,不论它被隐藏在文档结构中的什么位置。这两种方法会像您提供任何你所需要的HTML元素,不论它们在文档中所处的位置!getElementById()可通过指定的ID来返回元素:</p><pre> <ol> <li>document.getElementById("ID");  </li> </ol></pre><p>注释:getElementById() 无法工作在XML中。在XML文档中,您必须通过拥有类型id的属性来进行搜索,而此类型必须在XML DTD中进行声明。</p><p>getElementsByTagName() 方法会使用指定的标签名返回所有的元素(作为一个节点列表),这些元素是您在使用此方法时所处的元素的后代。getElementsByTagName() 可被用于任何的HTML元素:</p><p><strong>getElementsByTagName() 语法</strong></p><pre> <ol> <li>document.getElementsByTagName("标签名称");  </li> </ol></pre><p>或者:</p><pre> <ol> <li>document.getElementById('ID').getElementsByTagName("标签名称");  </li> </ol></pre><p><strong>实例 1</strong></p><p>下面这个例子会返回文档中所有<p>元素的一个节点列表:</p><pre> <ol> <li>document.getElementsByTagName("p");  </li> </ol></pre><p><strong>实例 2</strong></p><p>下面这个例子会返回所有<p>元素的一个节点列表,且这些<p>元素必须是id为"maindiv"的元素的后代:</p><pre> <ol> <li>document.getElementById('maindiv').getElementsByTagName("p");  </li> </ol></pre><p><strong>节点列表(nodeList)</strong></p><p>当我们使用节点列表时,通常要把此列表保存在一个变量中,就像这样:</p><pre> <ol> <li>var x=document.getElementsByTagName("p"); </li> </ol></pre><p>现在,变量x包含着页面中所有<p>元素的一个列表,并且我们可以通过它们的索引号来访问这些<p>元素。注释:索引号从0开始。您可以通过使用length属性来循环遍历节点列表:</p><pre> <ol> <li>var x=document.getElementsByTagName("p");  </li> <li>for (var i=0;i<x.length;i++)  </li> <li>  {   </li> <li>  // do something with each paragraph  </li> <li>  } </li> </ol></pre><p>您也可以通过索引号来访问某个具体的元素。要访问第三个<p>元素,您可以这么写:</p><pre> <ol> <li>var y=x[2]; </li> </ol></pre><p><strong>parentNode、firstChild以及lastChild</strong></p><p>这三个属性 parentNode、firstChild 以及 lastChild 可遵循文档的结构,在文档中进行“短距离的旅行”。请看下面这个HTML片段:</p><pre> <ol> <li><table> </li> <li>  <tr> </li> <li>    <td>John</td> </li> <li>    <td>Doe</td> </li> <li>    <td>Alaska</td> </li> <li>  </tr> </li> <li></table> </li> </ol></pre><p>在上面的HTML代码中,***个<td>是<tr>元素的***子元素(firstChild),而***一个<td>是<tr>元素的***一个子元素(lastChild)。此外,<tr>是每个<td>元素的父节点(parentNode)。对firstChild最普遍的用法是访问某个元素的文本:</p><pre> <ol> <li>var x=[a paragraph];  </li> <li>var text=x.firstChild.nodeValue;  </li> </ol></pre><p>parentNode属性常被用来改变文档的结构。假设您希望从文档中删除带有id为"maindiv"的节点:</p><pre> <ol> <li>var x=document.getElementById("maindiv");  </li> <li>x.parentNode.removeChild(x);  </li> </ol></pre><p>首先,您需要找到带有指定id的节点,然后移至其父节点并执行removeChild()方法。</p><p>#p#</p><p><strong>根节点</strong></p><p>有两种特殊的文档属性可用来访问根节点:</p><pre> <ol> <li>document.documentElement   </li> <li>document.body  </li> </ol></pre><p>***个属性可返回存在于XML以及HTML文档中的文档根节点。第二个属性是对HTML页面的特殊扩展,提供了对<body>标签的直接访问。</p><p><strong>HTML DOM 节点信息</strong></p><p>nodeName、nodeValue以及nodeType包含有关于节点的信息。</p><p><strong>节点信息</strong></p><p>每个节点都拥有包含着关于节点某些信息的属性。这些属性是:</p><p>◆nodeName(节点名称)</p><p>◆nodeValue(节点值)</p><p>◆nodeType(节点类型)</p><p><strong>nodeName</strong></p><p>nodeName属性含有某个节点的名称。</p><p>◆元素节点的nodeName是标签名称</p><p>◆属性节点的nodeName是属性名称</p><p>◆文本节点的nodeName永远是#text</p><p>◆文档节点的nodeName永远是#document</p><p>注释:nodeName所包含的XML元素的标签名称永远是大写的</p><p><strong>nodeValue</strong></p><p>◆对于文本节点,nodeValue属性包含文本。</p><p>◆对于属性节点,nodeValue属性包含属性值。</p><p>◆nodeValue属性对于文档节点和元素节点是不可用的。</p><p><strong>nodeType</strong></p><p>nodeType属性可返回节点的类型。最重要的节点类型是:</p><p><strong>一个 HTML DOM 实例</strong></p><p>下面这个例子向我们展示了当一个用户在文档中点击时,HTML文档的背景颜色如何被改变。</p><pre> <ol> <li><html> </li> <li><head> </li> <li><script type="text/javascript"> </li> <li>function ChangeColor()  </li> <li>{  </li> <li>document.body.bgColor="yellow" </li> <li>}  </li> <li></script> </li> <li></head> </li> <li><body onclick="ChangeColor()"> </li> <li>Click on this document!  </li> <li></body> </li> <li></html> </li> </ol></pre><p><em>原文链接:http://www.webjx.com/htmldata/2007-09-21/1190376115.html</em></p> <br> 本文标题:HTMLDOM入门级知识手册 <br> URL标题:<a href="http://jxjierui.cn/article/cdodhcc.html">http://jxjierui.cn/article/cdodhcc.html</a> </div> <div class="hot_new"> <div class="page_title clearfix"> <h3>其他资讯</h3> </div> <div class="news_list clearfix"> <ul> <li> <a href="/article/dhpcccg.html">海外云主机推荐</a> </li><li> <a href="/article/dhpccoe.html">为什么选择香港服务器香港服务器有哪些优点?(为啥很多外贸电商平台选择香港服务器)</a> </li><li> <a href="/article/dhpccso.html">Linux进入recovery教程及注意事项(linux进入recovery)</a> </li><li> <a 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style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">会话信息 : SESSION_ID=c6klqoiv1blhpu8jh1g58lov11</li> </ol> </div> <div style="display:none;"> <ol style="padding: 0; margin:0"> <li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">/home/wwwroot/jxjierui.cn/index.php ( 1.12 KB )</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">/home/wwwroot/jxjierui.cn/ThinkPHP/ThinkPHP.php ( 4.61 KB )</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">/home/wwwroot/jxjierui.cn/ThinkPHP/Library/Think/Think.class.php ( 12.26 KB )</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">/home/wwwroot/jxjierui.cn/ThinkPHP/Library/Think/Storage.class.php ( 1.37 KB )</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">/home/wwwroot/jxjierui.cn/ThinkPHP/Library/Think/Storage/Driver/File.class.php ( 3.52 KB )</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 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style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">/home/wwwroot/jxjierui.cn/ThinkPHP/Library/Think/View.class.php ( 7.59 KB )</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">/home/wwwroot/jxjierui.cn/ThinkPHP/Library/Behavior/BuildLiteBehavior.class.php ( 3.68 KB )</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">/home/wwwroot/jxjierui.cn/ThinkPHP/Library/Behavior/ParseTemplateBehavior.class.php ( 3.88 KB )</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">/home/wwwroot/jxjierui.cn/ThinkPHP/Library/Behavior/ContentReplaceBehavior.class.php ( 1.91 KB )</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">/home/wwwroot/jxjierui.cn/ThinkPHP/Conf/convention.php ( 11.15 KB )</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">/home/wwwroot/jxjierui.cn/App/Common/Conf/config.php ( 2.12 KB )</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">/home/wwwroot/jxjierui.cn/ThinkPHP/Lang/zh-cn.php ( 2.55 KB )</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">/home/wwwroot/jxjierui.cn/ThinkPHP/Conf/debug.php ( 1.48 KB )</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">/home/wwwroot/jxjierui.cn/App/Home/Conf/config.php ( 0.32 KB )</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">/home/wwwroot/jxjierui.cn/App/Home/Common/function.php ( 3.33 KB )</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">/home/wwwroot/jxjierui.cn/ThinkPHP/Library/Behavior/ReadHtmlCacheBehavior.class.php ( 5.62 KB )</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">/home/wwwroot/jxjierui.cn/App/Home/Controller/ArticleController.class.php ( 6.11 KB )</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">/home/wwwroot/jxjierui.cn/App/Home/Controller/CommController.class.php ( 1.60 KB )</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">/home/wwwroot/jxjierui.cn/ThinkPHP/Library/Think/Model.class.php ( 60.11 KB )</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">/home/wwwroot/jxjierui.cn/ThinkPHP/Library/Think/Db.class.php ( 32.43 KB )</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">/home/wwwroot/jxjierui.cn/ThinkPHP/Library/Think/Db/Driver/Pdo.class.php ( 16.74 KB )</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">/home/wwwroot/jxjierui.cn/ThinkPHP/Library/Think/Cache.class.php ( 3.83 KB )</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">/home/wwwroot/jxjierui.cn/ThinkPHP/Library/Think/Cache/Driver/File.class.php ( 5.87 KB )</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">/home/wwwroot/jxjierui.cn/ThinkPHP/Library/Think/Template.class.php ( 28.16 KB )</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">/home/wwwroot/jxjierui.cn/ThinkPHP/Library/Think/Template/TagLib/Cx.class.php ( 22.40 KB )</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">/home/wwwroot/jxjierui.cn/ThinkPHP/Library/Think/Template/TagLib.class.php ( 9.16 KB )</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">/home/wwwroot/jxjierui.cn/App/Runtime/Cache/Home/7540f392f42b28b481b30614275e4e55.php ( 13.96 KB )</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">/home/wwwroot/jxjierui.cn/ThinkPHP/Library/Behavior/WriteHtmlCacheBehavior.class.php ( 0.97 KB )</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">/home/wwwroot/jxjierui.cn/ThinkPHP/Library/Behavior/ShowPageTraceBehavior.class.php ( 5.24 KB )</li> </ol> </div> <div style="display:none;"> <ol style="padding: 0; margin:0"> <li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">[ app_init ] --START--</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">Run Behavior\BuildLiteBehavior [ RunTime:0.000004s ]</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">[ app_init ] --END-- [ RunTime:0.000022s ]</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">[ app_begin ] --START--</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">Run Behavior\ReadHtmlCacheBehavior [ RunTime:0.000144s ]</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">[ app_begin ] --END-- [ RunTime:0.000156s ]</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">[ view_parse ] --START--</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">[ template_filter ] --START--</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">Run Behavior\ContentReplaceBehavior [ RunTime:0.000052s ]</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">[ template_filter ] --END-- [ RunTime:0.000070s ]</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">Run Behavior\ParseTemplateBehavior [ RunTime:0.003533s ]</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">[ view_parse ] --END-- [ RunTime:0.003548s ]</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">[ view_filter ] --START--</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">Run Behavior\WriteHtmlCacheBehavior [ RunTime:0.000064s ]</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">[ view_filter ] --END-- [ RunTime:0.000072s ]</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">[ app_end ] --START--</li> </ol> </div> <div style="display:none;"> <ol style="padding: 0; margin:0"> <li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">1064:You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ') LIMIT 1' at line 1 [ SQL语句 ] : SELECT `id`,`pid`,`navname` FROM `cx_nav` WHERE ( id= ) LIMIT 1 </li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">1064:You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ') LIMIT 1' at line 1 [ SQL语句 ] : SELECT `id`,`navname` FROM `cx_nav` WHERE ( id= ) LIMIT 1 </li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">1064:You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ')' at line 1 [ SQL语句 ] : SELECT `id`,`navname` FROM `cx_nav` WHERE ( pid= ) </li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">[8] Undefined index: pid /home/wwwroot/jxjierui.cn/App/Home/Controller/ArticleController.class.php 第 47 行.</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">[2] file_put_contents(./App/Runtime/Temp/046080a6d8307670dfd468a799202952.php): failed to open stream: Permission denied /home/wwwroot/jxjierui.cn/ThinkPHP/Library/Think/Cache/Driver/File.class.php 第 132 行.</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">[8] Undefined index: db_host /home/wwwroot/jxjierui.cn/ThinkPHP/Library/Think/Db.class.php 第 120 行.</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">[8] Undefined index: db_port /home/wwwroot/jxjierui.cn/ThinkPHP/Library/Think/Db.class.php 第 121 行.</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">[8] Undefined index: db_name /home/wwwroot/jxjierui.cn/ThinkPHP/Library/Think/Db.class.php 第 122 行.</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">[2] file_put_contents(./App/Runtime/Temp/6ac6cc910d90a89c07bd9eda810aca9f.php): failed to open stream: Permission denied /home/wwwroot/jxjierui.cn/ThinkPHP/Library/Think/Cache/Driver/File.class.php 第 132 行.</li> </ol> </div> <div style="display:none;"> <ol style="padding: 0; margin:0"> </ol> </div> <div style="display:none;"> <ol style="padding: 0; margin:0"> </ol> </div> </div> </div> <div id="think_page_trace_close" style="display:none;text-align:right;height:15px;position:absolute;top:10px;right:12px;cursor: pointer;"><img style="vertical-align:top;" 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