dom属性指什么意思(DOM和SUB是什么属性)

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DOM 还使用术语元素(Element)它与节点非常相似。那么,DOM节点和元素之间有什么区别呢?

dom属性指什么意思(DOM和SUB是什么属性)

1. DOM节点

理解节点和元素之间区别的关键是理解节点是什么。

更高的角度来看,DOM文档由节点层次结构组成。每个节点可以具有父级和/或子级。

看看下面的HTML文档:

My Page

My Page

Thank you for visiting my web page!

该文档包含以下节点层次结构:

dom属性指什么意思(DOM和SUB是什么属性)

是文档树中的一个节点。它有2个子节点:和。

子有3个子节点的节点:注释节点 ,标题

,段落

。节点的父节点是节点。

HTML文档中的标记代表一个节点,有趣的是普通文本也是一个节点。段落节点

有1个子节点:文本节点“Thank you for visiting my web page!”。

1.2节点类型

我们要如何区分这些不同类型的节点?答案在于DOM Node接口,尤其是Node.nodeType属性

Node.nodeType可以具有代表节点类型的以下值之一:

  • Node.ELEMENT_NODE
  • Node.ATTRIBUTE_NODE
  • Node.TEXT_NODE
  • Node.CDATA_SECTION_NODE
  • Node.PROCESSING_INSTRUCTION_NODE
  • Node.COMMENT_NODE
  • Node.DOCUMENT_NODE
  • Node.DOCUMENT_TYPE_NODE
  • Node.DOCUMENT_FRAGMENT_NODE
  • Node.NOTATION_NODE

常量有意义地指示节点类型:例如Node.ELEMENT_NODE代表元素节点,Node.TEXT_NODE代表文本节点,Node.DOCUMENT_NODE文档节点,依此类推。

例如,让我们选择段落节点,然后查看其nodeType属性:

const paragraph = document.querySelector(\'p\');

paragraph.nodeType === Node.ELEMENT_NODE; // => true

代表整个节点文档树的节点类型为Node.DOCUMENT_NODE:

document.nodeType === Node.DOCUMENT_NODE; // => true

2. DOM元素

掌握了DOM节点的知识之后,现在该区分DOM节点和元素了。

如果你了解节点术语,那么答案是显而易见的:元素是特定类型的节点 element (Node.ELEMENT_NODE),以及文档、注释、文本等类型。

简而言之,元素是使用HTML文档中的标记编写的节点。,,,,</p><h2>,</p><p>都是元素,因为它们由标签表示。</p><p>文档类型,注释,文本节点不是元素,因为它们没有使用标签编写:</p><p>Node是节点的构造函数,HTMLElement 是 JS DOM 中元素的构造函数。段落既是节点又是元素,它同时是Node和HTMLElement的实例</p><p><code>const paragraph = document.querySelector(\'p\');</code></p><p>paragraph instanceof Node;        // => trueparagraph instanceof HTMLElement; // => true</p><p>简单地说,元素是节点的子类型,就像猫是动物的子类型一样。</p><p><strong>3. DOM属性:节点和元素</strong></p><p>除了区分节点和元素之外,还需要区分只包含节点或只包含元素的DOM属性。</p><p>节点类型的以下属性评估为一个节点或节点集合(NodeList):</p><p><code>node.parentNode; // Node or null</code></p><p>node.firstChild; // Node or nullnode.lastChild;  // Node or null</p><p>node.childNodes; // NodeList</p><p>但是,以下属性是元素或元素集合(HTMLCollection):</p><p><code>node.parentElement; // HTMLElement or null</code></p><p>node.children;      // HTMLCollection</p><p>由于node.childNodes和node.children都返回子级列表,因此为什么要同时具有这两个属性?好问题!</p><p>考虑以下包含某些文本的段落元素:</p><p><code></p><p><b>Thank you</b> for visiting my web page!</p><p></code></p><p>打开演示,然后查看parapgraph节点的childNodes和children属性:</p><p><code>const paragraph = document.querySelector(\'p\');</code></p><p>paragraph.childNodes; // NodeList:       [HTMLElement, Text]paragraph.children;   // HTMLCollection: [HTMLElement]</p><p>paragraph.childNodes集合包含2个节点:<b>Thank you</b>,,以及for visiting my web page!文本节点!</p><p>但是,paragraph.children集合仅包含1个项目:<b>Thank you</b>。</p><p>由于paragraph.children仅包含元素,因此此处未包含文本节点,因为其类型是文本(Node.TEXT_NODE),而不是元素(Node.ELEMENT_NODE)。</p><p>同时拥有node.childNodes和node.children,我们可以选择要访问的子级集合:所有子级节点或仅子级是元素。</p><p><strong>4.总结</strong></p><p>DOM文档是节点的分层集合,每个节点可以具有父级和/或子级。如果了解节点是什么,那么了解DOM节点和元素之间的区别就很容易。</p><p>节点有类型,元素类型就是其中之一,元素由HTML文档中的标记表示。</p><p>完~ 我是小智,我要去刷碗了,我们下期再见!</p></div><div class="post-tags my-3"><i class="iconfont icon-tags mr-2"></i><a href="https://www.aiodt.com/article" class="btn vc-l-blue btn-sm text-xs text-height-xs m-1 rounded-pill" rel="tag" title="查看更多文章"># 推荐</a><a href="https://www.aiodt.com/tag/%e5%85%83%e7%b4%a0" class="btn vc-l-yellow btn-sm text-xs text-height-xs m-1 rounded-pill" rel="tag" title="查看更多文章"># 元素</a><a href="https://www.aiodt.com/tag/%e5%b1%9e%e6%80%a7" class="btn vc-l-cyan btn-sm text-xs text-height-xs m-1 rounded-pill" rel="tag" title="查看更多文章"># 属性</a><a href="https://www.aiodt.com/tag/%e6%96%87%e6%a1%a3" class="btn btn-sm text-xs text-height-xs m-1 rounded-pill" rel="tag" 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