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html5中节点是什么意思

青灯夜游
发布: 2022-01-17 14:18:39
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在html5中,节点(node)是构成网页的最基本的组成部分,网页中的每一个部分都可以称为是一个节点;如: html 元素、属性、文本、注释、整个文档等都是一个节点。

html5中节点是什么意思

本教程操作环境:windows7系统、HTML5版、Dell G3电脑。

节点(node)是构成我们网页的最基本的组成部分,网页中的每一个部分都可以称为是一个节点:

  • 整个文档是一个文档节点

  • 每个 HTML 元素是元素节点

  • HTML 元素内的文本是文本节点

  • 每个 HTML 属性是属性节点

  • 注释是注释节点

html 元素、属性、文本、注释、整个文档等都是一个节点。

HTML中的节点有四种类型:

  • 文档节点:表示整个html;

  • 元素节点:表示标签及其所包含的内容;

  • 属性节点:HTML 标记中的属性;

  • 文本节点:标签中的内容文本。

节点树:

1.gif

节点父、子和同胞

节点树中的节点彼此拥有层级关系。

我们常用父(parent)、子(child)和同胞(sibling)等术语来描述这些关系。父节点拥有子节点。同级的子节点被称为同胞(兄弟或姐妹)。

  • 在节点树中,顶端节点被称为根(root)。

  • 每个节点都有父节点、除了根(它没有父节点)。

  • 一个节点可拥有任意数量的子节点。

  • 同胞是拥有相同父节点的节点。

下面的图片展示了节点树的一部分,以及节点之间的关系:

2.gif

请看下面的 HTML 片段:

<html>
  <head>
    <meta charset="utf-8">
    <title>节点</title>
  </head>
  <body>
    <h1>DOM 课程1</h1>
    <p>Hello world!</p>
  </body>
</html>
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从上面的 HTML 中:

  • 节点没有父节点;它是根节点

  • 和 的父节点是 节点

  • 文本节点 "Hello world!" 的父节点是

    节点

并且:

  • 节点拥有两个子节点: 和

  • 节点拥有两个子节点: 节点</p></li> <li><p><title> 节点也拥有一个子节点:文本节点 "DOM 教程"</p></li> <li><p><h1> 和 <p> 节点是同胞节点,同时也是 <body> 的子节点</p></li> </ul> <p>并且:</p> <ul style="list-style-type: disc;"> <li><p><head> 元素是 <html> 元素的首个子节点</p></li> <li><p><body> 元素是 <html> 元素的最后一个子节点</p></li> <li><p><h1> 元素是 <body> 元素的首个子节点</p></li> <li><p><p> 元素是 <body> 元素的最后一个子节点</p></li> </ul> <p>相关推荐:《<a href="http://www.php.cn/course/list/11.html" target="_blank" textvalue="html视频教程">html视频教程</a>》</p><p>以上是html5中节点是什么意思的详细内容。更多信息请关注PHP中文网其他相关文章!</p> </div> </div> <div style="height: 25px;"> <div class="wzconBq" style="display: inline-flex;"> <span>相关标签:</span> <div class="wzcbqd"> <a onclick="hits_log(2,'www',this);" href-data="https://www.php.cn/zh/search?word=html5" target="_blank">html5</a> <a onclick="hits_log(2,'www',this);" href-data="https://www.php.cn/zh/search?word=节点" target="_blank">节点</a> </div> </div> <div style="display: inline-flex;float: right; color:#333333;">来源:php.cn</div> </div> <div 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