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使用HTML DOM，可以使用节点关系来导航"节点树"。
一、DOM 节点
在一个HTML文档都是一个节点，The entire document is a document node 每个HTML元素是元素节点 在HTML元素的文本是文本节点 每一个HTML属性是一个属性节点 所有注释都是注释节点。
使用HTML DOM, 在节点树的所有节点可以通过JavaScript访问。可以创建新节点，并可以修改或删除所有节点。
1. 节点关系
节点树中的节点彼此具有层次关系。
2. 子节点和节点值
在DOM处理中常见的错误就是认为一个元素节点包含文本。
<title id="demo">DOM Tutorialtitle>
元素节点</code></span><span md-inline="plain"> (在上面的实例中) 不包含文本。</span></p><p cid="n12" mdtype="paragraph" style="line-height: inherit;orphans: 4;margin-top: 0.8em;margin-bottom: 0.8em;white-space: pre-wrap;font-family: "Open Sans", "Clear Sans", "Helvetica Neue", Helvetica, Arial, sans-serif;font-size: 16px;text-align: start;"><span md-inline="plain">它包含有值的文本节点 "DOM Tutorial"。</span></p><p cid="n13" mdtype="paragraph" style="line-height: inherit;orphans: 4;margin-top: 0.8em;margin-bottom: 0.8em;white-space: pre-wrap;font-family: "Open Sans", "Clear Sans", "Helvetica Neue", Helvetica, Arial, sans-serif;font-size: 16px;text-align: start;"><span md-inline="plain">该文本节点的值可以通过节点的innerHTML属性访问。</span></p><section class="code-snippet__fix code-snippet__js"><ul class="code-snippet__line-index code-snippet__js"><li></li></ul><pre class="code-snippet__js" data-lang="javascript"><code><span class="code-snippet_outer"><span class="code-snippet__keyword">var</span> myTitle = <span class="code-snippet__built_in">document</span>.getElementById(<span class="code-snippet__string">"demo"</span>).innerHTML;</span></code></pre></section><p cid="n15" mdtype="paragraph" style="line-height: inherit;orphans: 4;margin-top: 0.8em;margin-bottom: 0.8em;white-space: pre-wrap;font-family: "Open Sans", "Clear Sans", "Helvetica Neue", Helvetica, Arial, sans-serif;font-size: 16px;text-align: start;"><span md-inline="plain">访问innerHTML属性访问和访问第一个子节点值相同:</span></p><section class="code-snippet__fix code-snippet__js"><ul class="code-snippet__line-index code-snippet__js"><li></li></ul><pre class="code-snippet__js" data-lang="javascript"><code><span class="code-snippet_outer"><span class="code-snippet__keyword">var</span> myTitle = <span class="code-snippet__built_in">document</span>.getElementById(<span class="code-snippet__string">"demo"</span>).firstChild.nodeValue;</span></code></pre></section><p cid="n17" mdtype="paragraph" style="line-height: inherit;orphans: 4;margin-top: 0.8em;margin-bottom: 0.8em;white-space: pre-wrap;font-family: "Open Sans", "Clear Sans", "Helvetica Neue", Helvetica, Arial, sans-serif;font-size: 16px;text-align: start;"><span md-inline="plain">访问第一个子节点也可以这样做:</span></p><section class="code-snippet__fix code-snippet__js"><ul class="code-snippet__line-index code-snippet__js"><li></li></ul><pre class="code-snippet__js" data-lang="javascript"><code><span class="code-snippet_outer"><span class="code-snippet__keyword">var</span> myTitle = <span class="code-snippet__built_in">document</span>.getElementById(<span class="code-snippet__string">"demo"</span>).childNodes[<span class="code-snippet__number">0</span>].nodeValue;</span></code></pre></section><p cid="n19" mdtype="paragraph" style="line-height: inherit;orphans: 4;margin-top: 0.8em;margin-bottom: 0.8em;white-space: pre-wrap;font-family: "Open Sans", "Clear Sans", "Helvetica Neue", Helvetica, Arial, sans-serif;font-size: 16px;text-align: start;"><span md-inline="strong"><strong>实例1：</strong></span></p><p cid="n20" mdtype="paragraph" style="line-height: inherit;orphans: 4;margin-top: 0.8em;margin-bottom: 0.8em;white-space: pre-wrap;font-family: "Open Sans", "Clear Sans", "Helvetica Neue", Helvetica, Arial, sans-serif;font-size: 16px;text-align: start;"><span md-inline="plain">查询</span><span md-inline="code" spellcheck="false"><code style="font-family: var(--monospace);vertical-align: initial;border-width: 1px;border-style: solid;border-color: rgb(231, 234, 237);background-color: rgb(243, 244, 244);border-radius: 3px;padding-right: 2px;padding-left: 2px;font-size: 0.9em;"><h1></code></span><span md-inline="plain">元素的文本，并且拷贝它到</span><span md-inline="code" spellcheck="false"><code style="font-family: var(--monospace);vertical-align: initial;border-width: 1px;border-style: solid;border-color: rgb(231, 234, 237);background-color: rgb(243, 244, 244);border-radius: 3px;padding-right: 2px;padding-left: 2px;font-size: 0.9em;"><p></code></span><span md-inline="plain">元素。</span></p><section class="code-snippet__fix code-snippet__js"><ul class="code-snippet__line-index code-snippet__js"><li></li><li></li><li></li><li></li><li></li><li></li><li></li><li></li><li></li><li></li><li></li><li></li><li></li><li></li><li></li><li></li><li></li></ul><pre class="code-snippet__js" data-lang="xml"><code><span class="code-snippet_outer"><span class="code-snippet__meta"><!DOCTYPE html></span></span></code><code><span class="code-snippet_outer"><span class="code-snippet__tag"><<span class="code-snippet__name">html</span> <span class="code-snippet__attr">lang</span>=<span class="code-snippet__string">"en"</span>></span></span></code><code><span class="code-snippet_outer"><span class="code-snippet__tag"><<span class="code-snippet__name">head</span>></span></span></code><code><span class="code-snippet_outer"><span class="code-snippet__tag"><<span class="code-snippet__name">meta</span> <span class="code-snippet__attr">charset</span>=<span class="code-snippet__string">"UTF-8"</span>></span></span></code><code><span class="code-snippet_outer"><span class="code-snippet__tag"><<span class="code-snippet__name">title</span>></span>项目<span class="code-snippet__tag"></<span class="code-snippet__name">title</span>></span></span></code><code><span class="code-snippet_outer"><span class="code-snippet__tag"></<span class="code-snippet__name">head</span>></span></span></code><code><span class="code-snippet_outer"><span class="code-snippet__tag"><<span class="code-snippet__name">body</span> <span class="code-snippet__attr">style</span>=<span class="code-snippet__string">"background-color: aqua;"</span>></span></span></code><code><span class="code-snippet_outer"><br></span></code><code><span class="code-snippet_outer"><span class="code-snippet__tag"><<span class="code-snippet__name">h1</span> <span class="code-snippet__attr">id</span>=<span class="code-snippet__string">"id01"</span>></span>My First Page<span class="code-snippet__tag"></<span class="code-snippet__name">h1</span>></span></span></code><code><span class="code-snippet_outer"><span class="code-snippet__tag"><<span class="code-snippet__name">p</span> <span class="code-snippet__attr">id</span>=<span class="code-snippet__string">"id02"</span>></span><span class="code-snippet__tag"></<span class="code-snippet__name">p</span>></span></span></code><code><span class="code-snippet_outer"><br></span></code><code><span class="code-snippet_outer"><span class="code-snippet__tag"><<span class="code-snippet__name">script</span>></span></span></code><code><span class="code-snippet_outer"><span class="code-snippet__built_in">document</span>.getElementById(<span class="code-snippet__string">"id02"</span>).innerHTML = <span class="code-snippet__built_in">document</span>.getElementById(<span class="code-snippet__string">"id01"</span>).innerHTML;</span></code><code><span class="code-snippet_outer"><span class="code-snippet__tag"></<span class="code-snippet__name">script</span>></span></span></code><code><span class="code-snippet_outer"><br></span></code><code><span class="code-snippet_outer"><span class="code-snippet__tag"></<span class="code-snippet__name">body</span>></span></span></code><code><span class="code-snippet_outer"><span class="code-snippet__tag"></<span class="code-snippet__name">html</span>></span></span></code></pre></section><p style="text-align: center;"><img class="rich_pages" data-ratio="0.1547049441786284" data-s="300,640" src="https://filescdn.proginn.com/ca1cc720d1f157f268bd66b72cb103da/248f998d1d826c4347a2dda4b91896f9.webp" data-type="png" data-w="1254" style=""></p><p cid="n23" mdtype="paragraph" style="line-height: inherit;orphans: 4;margin-top: 0.8em;margin-bottom: 0.8em;white-space: pre-wrap;font-family: "Open Sans", "Clear Sans", "Helvetica Neue", Helvetica, Arial, sans-serif;font-size: 16px;text-align: start;"><span md-inline="strong"><strong>实例2：</strong></span><br></p><section class="code-snippet__fix code-snippet__js"><ul class="code-snippet__line-index code-snippet__js"><li></li><li></li><li></li><li></li><li></li><li></li><li></li><li></li><li></li><li></li><li></li><li></li><li></li><li></li><li></li><li></li><li></li></ul><pre class="code-snippet__js" data-lang="xml"><code><span class="code-snippet_outer"><span class="code-snippet__meta"><!DOCTYPE html></span></span></code><code><span class="code-snippet_outer"><span class="code-snippet__tag"><<span class="code-snippet__name">html</span> <span class="code-snippet__attr">lang</span>=<span class="code-snippet__string">"en"</span>></span></span></code><code><span class="code-snippet_outer"><span class="code-snippet__tag"><<span class="code-snippet__name">head</span>></span></span></code><code><span class="code-snippet_outer"><span class="code-snippet__tag"><<span class="code-snippet__name">meta</span> <span class="code-snippet__attr">charset</span>=<span class="code-snippet__string">"UTF-8"</span>></span></span></code><code><span class="code-snippet_outer"><span class="code-snippet__tag"><<span class="code-snippet__name">title</span>></span>项目<span class="code-snippet__tag"></<span class="code-snippet__name">title</span>></span></span></code><code><span class="code-snippet_outer"><span class="code-snippet__tag"></<span class="code-snippet__name">head</span>></span></span></code><code><span class="code-snippet_outer"><span class="code-snippet__tag"><<span class="code-snippet__name">body</span> <span class="code-snippet__attr">style</span>=<span class="code-snippet__string">"background-color: aqua;"</span>></span></span></code><code><span class="code-snippet_outer"><br></span></code><code><span class="code-snippet_outer"> <span class="code-snippet__tag"><<span class="code-snippet__name">h1</span> <span class="code-snippet__attr">id</span>=<span class="code-snippet__string">"id01"</span>></span>My First Page<span class="code-snippet__tag"></<span class="code-snippet__name">h1</span>></span></span></code><code><span class="code-snippet_outer"> <span class="code-snippet__tag"><<span class="code-snippet__name">p</span> <span class="code-snippet__attr">id</span>=<span class="code-snippet__string">"id02"</span>></span><span class="code-snippet__tag"></<span class="code-snippet__name">p</span>></span></span></code><code><span class="code-snippet_outer"><br></span></code><code><span class="code-snippet_outer"> <span class="code-snippet__tag"><<span class="code-snippet__name">script</span>></span></span></code><code><span class="code-snippet_outer"> <span class="code-snippet__built_in">document</span>.getElementById(<span class="code-snippet__string">"id02"</span>).innerHTML = <span class="code-snippet__built_in">document</span>.getElementById(<span class="code-snippet__string">"id01"</span>).firstChild.nodeValue;</span></code><code><span class="code-snippet_outer"><span class="code-snippet__tag"></<span class="code-snippet__name">script</span>></span></span></code><code><span class="code-snippet_outer"><br></span></code><code><span class="code-snippet_outer"><span class="code-snippet__tag"></<span class="code-snippet__name">body</span>></span></span></code><code><span class="code-snippet_outer"><span class="code-snippet__tag"></<span class="code-snippet__name">html</span>></span></span></code></pre></section><p style="text-align: center;"><img class="rich_pages" data-ratio="0.18968023255813954" data-s="300,640" src="https://filescdn.proginn.com/25aa5596c081681e3f8211b3d9e0f9f0/e6b51b3b745d806cf3f4fe4eac66664c.webp" data-type="png" data-w="1376" style=""></p><p cid="n26" mdtype="paragraph" style="line-height: inherit;orphans: 4;margin-top: 0.8em;margin-bottom: 0.8em;white-space: pre-wrap;font-family: "Open Sans", "Clear Sans", "Helvetica Neue", Helvetica, Arial, sans-serif;font-size: 16px;text-align: start;"><span md-inline="strong"><strong>实例3 ：</strong></span><br></p><section class="code-snippet__fix code-snippet__js"><ul class="code-snippet__line-index code-snippet__js"><li></li><li></li><li></li><li></li><li></li><li></li><li></li><li></li><li></li><li></li><li></li><li></li><li></li><li></li><li></li><li></li></ul><pre class="code-snippet__js" data-lang="xml"><code><span class="code-snippet_outer"><span class="code-snippet__meta"><!DOCTYPE html></span></span></code><code><span class="code-snippet_outer"><span class="code-snippet__tag"><<span class="code-snippet__name">html</span> <span class="code-snippet__attr">lang</span>=<span class="code-snippet__string">"en"</span>></span></span></code><code><span class="code-snippet_outer"><span class="code-snippet__tag"><<span class="code-snippet__name">head</span>></span></span></code><code><span class="code-snippet_outer"><span class="code-snippet__tag"><<span class="code-snippet__name">meta</span> <span class="code-snippet__attr">charset</span>=<span class="code-snippet__string">"UTF-8"</span>></span></span></code><code><span class="code-snippet_outer"><span class="code-snippet__tag"><<span class="code-snippet__name">title</span>></span>项目<span class="code-snippet__tag"></<span class="code-snippet__name">title</span>></span></span></code><code><span class="code-snippet_outer"><span class="code-snippet__tag"></<span class="code-snippet__name">head</span>></span></span></code><code><span class="code-snippet_outer"><span class="code-snippet__tag"><<span class="code-snippet__name">body</span> <span class="code-snippet__attr">style</span>=<span class="code-snippet__string">"background-color: aqua;"</span>></span></span></code><code><span class="code-snippet_outer"> <span class="code-snippet__tag"><<span class="code-snippet__name">h1</span> <span class="code-snippet__attr">id</span>=<span class="code-snippet__string">"id01"</span>></span>My First Page<span class="code-snippet__tag"></<span class="code-snippet__name">h1</span>></span></span></code><code><span class="code-snippet_outer"> <span class="code-snippet__tag"><<span class="code-snippet__name">p</span> <span class="code-snippet__attr">id</span>=<span class="code-snippet__string">"id02"</span>></span>Hello!<span class="code-snippet__tag"></<span class="code-snippet__name">p</span>></span></span></code><code><span class="code-snippet_outer"><br></span></code><code><span class="code-snippet_outer"> <span class="code-snippet__tag"><<span class="code-snippet__name">script</span>></span></span></code><code><span class="code-snippet_outer"> <span class="code-snippet__built_in">document</span>.getElementById(<span class="code-snippet__string">"id02"</span>).innerHTML = <span class="code-snippet__built_in">document</span>.getElementById(<span class="code-snippet__string">"id01"</span>).childNodes[<span class="code-snippet__number">0</span>].nodeValue;</span></code><code><span class="code-snippet_outer"><span class="code-snippet__tag"></<span class="code-snippet__name">script</span>></span></span></code><code><span class="code-snippet_outer"><br></span></code><code><span class="code-snippet_outer"><span class="code-snippet__tag"></<span class="code-snippet__name">body</span>></span></span></code><code><span class="code-snippet_outer"><span class="code-snippet__tag"></<span class="code-snippet__name">html</span>></span></span></code></pre></section><p><img class="rich_pages" data-ratio="0.18968023255813954" data-s="300,640" src="https://filescdn.proginn.com/25aa5596c081681e3f8211b3d9e0f9f0/e6b51b3b745d806cf3f4fe4eac66664c.webp" data-type="png" data-w="1376" style=""></p><p><br></p><h2 cid="n29" mdtype="heading" style="break-after: avoid-page;break-inside: avoid;orphans: 4;font-size: 1.75em;margin-top: 1rem;margin-bottom: 1rem;font-weight: bold;line-height: 1.225;cursor: text;padding-bottom: 0.3em;border-bottom: 1px solid rgb(238, 238, 238);white-space: pre-wrap;font-family: "Open Sans", "Clear Sans", "Helvetica Neue", Helvetica, Arial, sans-serif;text-align: start;"><span md-inline="plain">二、DOM 根节点</span><br></h2><p cid="n30" mdtype="paragraph" style="line-height: inherit;orphans: 4;margin-top: 0.8em;margin-bottom: 0.8em;white-space: pre-wrap;font-family: "Open Sans", "Clear Sans", "Helvetica Neue", Helvetica, Arial, sans-serif;font-size: 16px;text-align: start;"><span md-inline="plain">有两个特殊属性允许访问完整文档:</span></p><p cid="n31" mdtype="paragraph" style="line-height: inherit;orphans: 4;margin-top: 0.8em;margin-bottom: 0.8em;white-space: pre-wrap;font-family: "Open Sans", "Clear Sans", "Helvetica Neue", Helvetica, Arial, sans-serif;font-size: 16px;text-align: start;"><span md-inline="strong"><strong>document.body - 文档主体</strong></span></p><section class="code-snippet__fix code-snippet__js"><ul class="code-snippet__line-index code-snippet__js"><li></li><li></li><li></li><li></li><li></li><li></li><li></li><li></li><li></li><li></li><li></li><li></li><li></li><li></li><li></li><li></li><li></li><li></li></ul><pre class="code-snippet__js" data-lang="xml"><code><span class="code-snippet_outer"><span class="code-snippet__meta"><!DOCTYPE html></span></span></code><code><span class="code-snippet_outer"><span class="code-snippet__tag"><<span class="code-snippet__name">html</span> <span class="code-snippet__attr">lang</span>=<span class="code-snippet__string">"en"</span>></span></span></code><code><span class="code-snippet_outer"><span class="code-snippet__tag"><<span class="code-snippet__name">head</span>></span></span></code><code><span class="code-snippet_outer"><span class="code-snippet__tag"><<span class="code-snippet__name">meta</span> <span class="code-snippet__attr">charset</span>=<span class="code-snippet__string">"UTF-8"</span>></span></span></code><code><span class="code-snippet_outer"><span class="code-snippet__tag"><<span class="code-snippet__name">title</span>></span>项目<span class="code-snippet__tag"></<span class="code-snippet__name">title</span>></span></span></code><code><span class="code-snippet_outer"><span class="code-snippet__tag"></<span class="code-snippet__name">head</span>></span></span></code><code><span class="code-snippet_outer"><span class="code-snippet__tag"><<span class="code-snippet__name">body</span> <span class="code-snippet__attr">style</span>=<span class="code-snippet__string">"background-color: aqua;"</span>></span></span></code><code><span class="code-snippet_outer"><br></span></code><code><span class="code-snippet_outer"><span class="code-snippet__tag"><<span class="code-snippet__name">h1</span> <span class="code-snippet__attr">id</span>=<span class="code-snippet__string">"id01"</span>></span>我的第一个页面<span class="code-snippet__tag"></<span class="code-snippet__name">h1</span>></span></span></code><code><span class="code-snippet_outer"><span class="code-snippet__tag"><<span class="code-snippet__name">p</span> <span class="code-snippet__attr">id</span>=<span class="code-snippet__string">"id02"</span>></span><span class="code-snippet__tag"></<span class="code-snippet__name">p</span>></span></span></code><code><span class="code-snippet_outer"><br></span></code><code><span class="code-snippet_outer"><span class="code-snippet__tag"><<span class="code-snippet__name">script</span>></span></span></code><code><span class="code-snippet_outer"><span class="code-snippet__built_in">document</span>.getElementById(<span class="code-snippet__string">"id02"</span>).innerHTML = <span class="code-snippet__built_in">document</span>.getElementById(<span class="code-snippet__string">"id01"</span>).childNodes[<span class="code-snippet__number">0</span>].nodeValue;</span></code><code><span class="code-snippet_outer"><span class="code-snippet__tag"></<span class="code-snippet__name">script</span>></span></span></code><code><span class="code-snippet_outer"><br></span></code><code><span class="code-snippet_outer"><br></span></code><code><span class="code-snippet_outer"><span class="code-snippet__tag"></<span class="code-snippet__name">body</span>></span></span></code><code><span class="code-snippet_outer"><span class="code-snippet__tag"></<span class="code-snippet__name">html</span>></span></span></code></pre></section><p style="text-align: center;"><img class="rich_pages" data-ratio="0.49122807017543857" data-s="300,640" src="https://filescdn.proginn.com/2e1a2b1287fc1c528f04bdf5ab188130/23ffe2c7e67789051e2ccf25e36ae37a.webp" data-type="png" data-w="969" style=""></p><p cid="n34" mdtype="paragraph" style="line-height: inherit;orphans: 4;margin-top: 0.8em;margin-bottom: 0.8em;white-space: pre-wrap;font-family: "Open Sans", "Clear Sans", "Helvetica Neue", Helvetica, Arial, sans-serif;font-size: 16px;text-align: start;"><span md-inline="strong"><strong>document.documentElement - 完整的文档</strong></span><br></p><section class="code-snippet__fix code-snippet__js"><ul class="code-snippet__line-index code-snippet__js"><li></li><li></li><li></li><li></li><li></li><li></li><li></li><li></li><li></li><li></li><li></li><li></li><li></li><li></li><li></li><li></li><li></li><li></li><li></li></ul><pre class="code-snippet__js" data-lang="xml"><code><span class="code-snippet_outer"><span class="code-snippet__meta"><!DOCTYPE html></span></span></code><code><span class="code-snippet_outer"><span class="code-snippet__tag"><<span class="code-snippet__name">html</span> <span class="code-snippet__attr">lang</span>=<span class="code-snippet__string">"en"</span>></span></span></code><code><span class="code-snippet_outer"> <span class="code-snippet__tag"><<span class="code-snippet__name">head</span>></span></span></code><code><span class="code-snippet_outer"> <span class="code-snippet__tag"><<span class="code-snippet__name">meta</span> <span class="code-snippet__attr">charset</span>=<span class="code-snippet__string">"UTF-8"</span>></span></span></code><code><span class="code-snippet_outer"> <span class="code-snippet__tag"><<span class="code-snippet__name">title</span>></span>项目<span class="code-snippet__tag"></<span class="code-snippet__name">title</span>></span></span></code><code><span class="code-snippet_outer"> <span class="code-snippet__tag"></<span class="code-snippet__name">head</span>></span></span></code><code><span class="code-snippet_outer"> <span class="code-snippet__tag"><<span class="code-snippet__name">body</span> <span class="code-snippet__attr">style</span>=<span class="code-snippet__string">"background-color: aqua;"</span>></span></span></code><code><span class="code-snippet_outer"> <span class="code-snippet__tag"><<span class="code-snippet__name">p</span>></span>Hello World!<span class="code-snippet__tag"></<span class="code-snippet__name">p</span>></span></span></code><code><span class="code-snippet_outer"> <span class="code-snippet__tag"><<span class="code-snippet__name">div</span>></span></span></code><code><span class="code-snippet_outer"> <span class="code-snippet__tag"><<span class="code-snippet__name">p</span>></span>The DOM is very useful!<span class="code-snippet__tag"></<span class="code-snippet__name">p</span>></span></span></code><code><span class="code-snippet_outer"> <span class="code-snippet__tag"><<span class="code-snippet__name">p</span>></span>This example demonstrates the <span class="code-snippet__tag"><<span class="code-snippet__name">b</span>></span>document.documentElement<span class="code-snippet__tag"></<span class="code-snippet__name">b</span>></span> property.<span class="code-snippet__tag"></<span class="code-snippet__name">p</span>></span></span></code><code><span class="code-snippet_outer"> <span class="code-snippet__tag"></<span class="code-snippet__name">div</span>></span></span></code><code><span class="code-snippet_outer"><br></span></code><code><span class="code-snippet_outer"> <span class="code-snippet__tag"><<span class="code-snippet__name">script</span>></span></span></code><code><span class="code-snippet_outer"> alert(<span class="code-snippet__built_in">document</span>.documentElement.innerHTML);</span></code><code><span class="code-snippet_outer"><span class="code-snippet__tag"></<span class="code-snippet__name">script</span>></span></span></code><code><span class="code-snippet_outer"><br></span></code><code><span class="code-snippet_outer"><span class="code-snippet__tag"></<span class="code-snippet__name">body</span>></span></span></code><code><span class="code-snippet_outer"><span class="code-snippet__tag"></<span class="code-snippet__name">html</span>></span></span></code></pre></section><p style="text-align: center;"><img class="rich_pages" data-ratio="0.4566420664206642" data-s="300,640" src="https://filescdn.proginn.com/595ad9dc63c59be11e88f812d779706d/3148572d0661b7852228c2c5244af5ff.webp" data-type="png" data-w="1084" style=""></p><h4 cid="n37" mdtype="heading" style="break-after: avoid-page;break-inside: avoid;orphans: 4;font-size: 1.25em;margin-top: 1rem;margin-bottom: 1rem;font-weight: bold;line-height: 1.4;cursor: text;white-space: pre-wrap;font-family: "Open Sans", "Clear Sans", "Helvetica Neue", Helvetica, Arial, sans-serif;text-align: start;"><span md-inline="plain">1. nodeName 属性</span><br></h4><p cid="n38" mdtype="paragraph" style="line-height: inherit;orphans: 4;margin-top: 0.8em;margin-bottom: 0.8em;white-space: pre-wrap;font-family: "Open Sans", "Clear Sans", "Helvetica Neue", Helvetica, Arial, sans-serif;font-size: 16px;text-align: start;"><span md-inline="plain">nodeName属性指定一个节点的名称，nodeName 是只读的。</span></p><ol class="list-paddingleft-2" start="" cid="n39" mdtype="list" style="margin-top: 0.8em;margin-bottom: 0.8em;padding-left: 30px;font-family: "Open Sans", "Clear Sans", "Helvetica Neue", Helvetica, Arial, sans-serif;font-size: 16px;text-align: start;white-space: normal;"><li><p cid="n41" mdtype="paragraph" style="line-height: inherit;orphans: 4;margin-bottom: 0.5rem;white-space: pre-wrap;"><span md-inline="plain">nodeName 是只读的。</span></p></li><li><p cid="n43" mdtype="paragraph" style="line-height: inherit;orphans: 4;margin-bottom: 0.5rem;white-space: pre-wrap;"><span md-inline="plain">nodeName 一个元素节点的节点名称和标签名称相同。</span></p></li><li><p cid="n45" mdtype="paragraph" style="line-height: inherit;orphans: 4;margin-bottom: 0.5rem;white-space: pre-wrap;"><span md-inline="plain">一个属性节点的节点名称是属性名。</span></p></li><li><p cid="n47" mdtype="paragraph" style="line-height: inherit;orphans: 4;margin-bottom: 0.5rem;white-space: pre-wrap;"><span md-inline="plain">一个文本节点的nodeName总是 #text。</span></p></li><li><p cid="n49" mdtype="paragraph" style="line-height: inherit;orphans: 4;margin-bottom: 0.5rem;white-space: pre-wrap;"><span md-inline="plain">文档的节点名称总是 #document。</span></p></li></ol><section class="code-snippet__fix code-snippet__js"><ul class="code-snippet__line-index code-snippet__js"><li></li><li></li><li></li><li></li><li></li><li></li></ul><pre class="code-snippet__js" data-lang="xml"><code><span class="code-snippet_outer"><span class="code-snippet__tag"><<span class="code-snippet__name">h1</span> <span class="code-snippet__attr">id</span>=<span class="code-snippet__string">"id01"</span>></span>My First Page<span class="code-snippet__tag"></<span class="code-snippet__name">h1</span>></span></span></code><code><span class="code-snippet_outer"><span class="code-snippet__tag"><<span class="code-snippet__name">p</span> <span class="code-snippet__attr">id</span>=<span class="code-snippet__string">"id02"</span>></span><span class="code-snippet__tag"></<span class="code-snippet__name">p</span>></span></span></code><code><span class="code-snippet_outer"><br></span></code><code><span class="code-snippet_outer"><span class="code-snippet__tag"><<span class="code-snippet__name">script</span>></span></span></code><code><span class="code-snippet_outer"><span class="code-snippet__built_in">document</span>.getElementById(<span class="code-snippet__string">"id02"</span>).innerHTML = <span class="code-snippet__built_in">document</span>.getElementById(<span class="code-snippet__string">"id01"</span>).nodeName;</span></code><code><span class="code-snippet_outer"><span class="code-snippet__tag"></<span class="code-snippet__name">script</span>></span></span></code></pre></section><p style="text-align: center;"><img class="rich_pages" data-ratio="0.2390488110137672" data-s="300,640" src="https://filescdn.proginn.com/01ed1bf9b354e84f9f2644ec768d5df9/a0497aa4690b844a64e86ce5fd83f62a.webp" data-type="png" data-w="799" style=""></p><p cid="n52" mdtype="paragraph" style="line-height: inherit;orphans: 4;margin-top: 0.8em;margin-bottom: 0.8em;white-space: pre-wrap;font-family: "Open Sans", "Clear Sans", "Helvetica Neue", Helvetica, Arial, sans-serif;font-size: 16px;text-align: start;"><span md-inline="strong"><strong>注意:</strong></span><span md-inline="plain"> </span><br></p><p cid="n53" mdtype="paragraph" style="line-height: inherit;orphans: 4;margin-top: 0.8em;margin-bottom: 0.8em;white-space: pre-wrap;font-family: "Open Sans", "Clear Sans", "Helvetica Neue", Helvetica, Arial, sans-serif;font-size: 16px;text-align: start;"><span md-inline="plain">nodeName总是包含HTML元素的大写标签名称。</span></p><h4 cid="n54" mdtype="heading" style="break-after: avoid-page;break-inside: avoid;orphans: 4;font-size: 1.25em;margin-top: 1rem;margin-bottom: 1rem;font-weight: bold;line-height: 1.4;cursor: text;white-space: pre-wrap;font-family: "Open Sans", "Clear Sans", "Helvetica Neue", Helvetica, Arial, sans-serif;text-align: start;"><span md-inline="plain">2. nodeValue 属性</span></h4><p cid="n55" mdtype="paragraph" style="line-height: inherit;orphans: 4;margin-top: 0.8em;margin-bottom: 0.8em;white-space: pre-wrap;font-family: "Open Sans", "Clear Sans", "Helvetica Neue", Helvetica, Arial, sans-serif;font-size: 16px;text-align: start;"><span md-inline="plain">nodeValue 属性指定节点的值。素节点的节点值是 undefined，文本节点的节点是文本本身，属性节点的节点值是属性值。</span></p><h4 cid="n56" mdtype="heading" style="break-after: avoid-page;break-inside: avoid;orphans: 4;font-size: 1.25em;margin-top: 1rem;margin-bottom: 1rem;font-weight: bold;line-height: 1.4;cursor: text;white-space: pre-wrap;font-family: "Open Sans", "Clear Sans", "Helvetica Neue", Helvetica, Arial, sans-serif;text-align: start;"><span md-inline="plain">3. nodeType 属性</span></h4><p cid="n57" mdtype="paragraph" style="line-height: inherit;orphans: 4;margin-top: 0.8em;margin-bottom: 0.8em;white-space: pre-wrap;font-family: "Open Sans", "Clear Sans", "Helvetica Neue", Helvetica, Arial, sans-serif;font-size: 16px;text-align: start;"><span md-inline="plain">nodeType 属性返回节点类型. nodeType 是只读的。</span></p><section class="code-snippet__fix code-snippet__js"><ul class="code-snippet__line-index code-snippet__js"><li></li><li></li><li></li></ul><pre class="code-snippet__js" data-lang="xml"><code><span class="code-snippet_outer"><span class="code-snippet__tag"><<span class="code-snippet__name">script</span>></span></span></code><code><span class="code-snippet_outer"><span class="code-snippet__built_in">document</span>.getElementById(<span class="code-snippet__string">"id02"</span>).innerHTML = <span class="code-snippet__built_in">document</span>.getElementById(<span class="code-snippet__string">"id01"</span>).nodeType;</span></code><code><span class="code-snippet_outer"><span class="code-snippet__tag"></<span class="code-snippet__name">script</span>></span></span></code></pre></section><p style="text-align: center;"><img class="rich_pages" data-ratio="0.25254813137032844" data-s="300,640" src="https://filescdn.proginn.com/2159f6d6aafb807c494d6033e7447442/b64f53036c6781449ffb74df52bdd17a.webp" data-type="png" data-w="883" style=""></p><p style="text-align: center;"><br></p><h2 cid="n60" mdtype="heading" style="break-after: avoid-page;break-inside: avoid;orphans: 4;font-size: 1.75em;margin-top: 1rem;margin-bottom: 1rem;font-weight: bold;line-height: 1.225;cursor: text;padding-bottom: 0.3em;border-bottom: 1px solid rgb(238, 238, 238);white-space: pre-wrap;font-family: "Open Sans", "Clear Sans", "Helvetica Neue", Helvetica, Arial, sans-serif;text-align: start;"><span md-inline="plain">三、总结</span><br></h2><p cid="n61" mdtype="paragraph" style="line-height: inherit;orphans: 4;margin-top: 0.8em;margin-bottom: 0.8em;white-space: pre-wrap;font-family: "Open Sans", "Clear Sans", "Helvetica Neue", Helvetica, Arial, sans-serif;font-size: 16px;text-align: start;"><span md-inline="plain">本文基于JavaScript，介绍了页面上htmldom 导航的节点。节点和节点之间的关系，采用生动的比喻进行讲解。以及根节点的属性进行了详细讲解。通过丰富的案例，运行效果图的展示。希望能帮助读者更好的学习。</span></p><p cid="n62" mdtype="paragraph" style="line-height: inherit;orphans: 4;margin-top: 0.8em;margin-bottom: 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