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使用HTML DOM，可以使用節(jié)點關系來導航"節(jié)點樹"。
一、DOM 節(jié)點
在一個HTML文檔都是一個節(jié)點，The entire document is a document node 每個HTML元素是元素節(jié)點 在HTML元素的文本是文本節(jié)點 每一個HTML屬性是一個屬性節(jié)點 所有注釋都是注釋節(jié)點。
使用HTML DOM, 在節(jié)點樹的所有節(jié)點可以通過JavaScript訪問。可以創(chuàng)建新節(jié)點，并可以修改或刪除所有節(jié)點。
1. 節(jié)點關系
節(jié)點樹中的節(jié)點彼此具有層次關系。
2. 子節(jié)點和節(jié)點值
在DOM處理中常見的錯誤就是認為一個元素節(jié)點包含文本。
<title id="demo">DOM Tutorialtitle>
元素節(jié)點</code></span><span md-inline="plain"> (在上面的實例中) 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">它包含有值的文本節(jié)點 "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">該文本節(jié)點的值可以通過節(jié)點的innerHTML屬性訪問。</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 id="go7utgvlrp" class="code-snippet_outer"><span id="go7utgvlrp" class="code-snippet__keyword">var</span> myTitle = <span id="go7utgvlrp" class="code-snippet__built_in">document</span>.getElementById(<span id="go7utgvlrp" 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">訪問innerHTML屬性訪問和訪問第一個子節(jié)點值相同:</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 id="go7utgvlrp" class="code-snippet_outer"><span id="go7utgvlrp" class="code-snippet__keyword">var</span> myTitle = <span id="go7utgvlrp" class="code-snippet__built_in">document</span>.getElementById(<span id="go7utgvlrp" 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">訪問第一個子節(jié)點也可以這樣做:</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 id="go7utgvlrp" class="code-snippet_outer"><span id="go7utgvlrp" class="code-snippet__keyword">var</span> myTitle = <span id="go7utgvlrp" class="code-snippet__built_in">document</span>.getElementById(<span id="go7utgvlrp" class="code-snippet__string">"demo"</span>).childNodes[<span id="go7utgvlrp" 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>實例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">查詢</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，并且拷貝它到</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 id="go7utgvlrp" class="code-snippet_outer"><span id="go7utgvlrp" class="code-snippet__meta"><!DOCTYPE html></span></span></code><code><span id="go7utgvlrp" class="code-snippet_outer"><span id="go7utgvlrp" class="code-snippet__tag"><<span id="go7utgvlrp" class="code-snippet__name">html</span> <span id="go7utgvlrp" class="code-snippet__attr">lang</span>=<span id="go7utgvlrp" class="code-snippet__string">"en"</span>></span></span></code><code><span id="go7utgvlrp" class="code-snippet_outer"><span id="go7utgvlrp" class="code-snippet__tag"><<span id="go7utgvlrp" class="code-snippet__name">head</span>></span></span></code><code><span id="go7utgvlrp" class="code-snippet_outer"><span id="go7utgvlrp" class="code-snippet__tag"><<span id="go7utgvlrp" class="code-snippet__name">meta</span> <span id="go7utgvlrp" class="code-snippet__attr">charset</span>=<span id="go7utgvlrp" class="code-snippet__string">"UTF-8"</span>></span></span></code><code><span id="go7utgvlrp" class="code-snippet_outer"><span id="go7utgvlrp" class="code-snippet__tag"><<span id="go7utgvlrp" class="code-snippet__name">title</span>></span>項目<span id="go7utgvlrp" class="code-snippet__tag"></<span id="go7utgvlrp" class="code-snippet__name">title</span>></span></span></code><code><span id="go7utgvlrp" class="code-snippet_outer"><span id="go7utgvlrp" class="code-snippet__tag"></<span id="go7utgvlrp" class="code-snippet__name">head</span>></span></span></code><code><span id="go7utgvlrp" class="code-snippet_outer"><span id="go7utgvlrp" class="code-snippet__tag"><<span id="go7utgvlrp" class="code-snippet__name">body</span> <span id="go7utgvlrp" class="code-snippet__attr">style</span>=<span id="go7utgvlrp" class="code-snippet__string">"background-color: aqua;"</span>></span></span></code><code><span id="go7utgvlrp" class="code-snippet_outer"><br></span></code><code><span id="go7utgvlrp" class="code-snippet_outer"><span id="go7utgvlrp" class="code-snippet__tag"><<span id="go7utgvlrp" class="code-snippet__name">h1</span> <span id="go7utgvlrp" class="code-snippet__attr">id</span>=<span id="go7utgvlrp" class="code-snippet__string">"id01"</span>></span>My First Page<span id="go7utgvlrp" class="code-snippet__tag"></<span id="go7utgvlrp" class="code-snippet__name">h1</span>></span></span></code><code><span id="go7utgvlrp" class="code-snippet_outer"><span id="go7utgvlrp" class="code-snippet__tag"><<span id="go7utgvlrp" class="code-snippet__name">p</span> <span id="go7utgvlrp" class="code-snippet__attr">id</span>=<span id="go7utgvlrp" class="code-snippet__string">"id02"</span>></span><span id="go7utgvlrp" class="code-snippet__tag"></<span id="go7utgvlrp" class="code-snippet__name">p</span>></span></span></code><code><span id="go7utgvlrp" class="code-snippet_outer"><br></span></code><code><span id="go7utgvlrp" class="code-snippet_outer"><span id="go7utgvlrp" class="code-snippet__tag"><<span id="go7utgvlrp" class="code-snippet__name">script</span>></span></span></code><code><span id="go7utgvlrp" class="code-snippet_outer"><span id="go7utgvlrp" class="code-snippet__built_in">document</span>.getElementById(<span id="go7utgvlrp" class="code-snippet__string">"id02"</span>).innerHTML = <span id="go7utgvlrp" class="code-snippet__built_in">document</span>.getElementById(<span id="go7utgvlrp" class="code-snippet__string">"id01"</span>).innerHTML;</span></code><code><span id="go7utgvlrp" class="code-snippet_outer"><span id="go7utgvlrp" class="code-snippet__tag"></<span id="go7utgvlrp" class="code-snippet__name">script</span>></span></span></code><code><span id="go7utgvlrp" class="code-snippet_outer"><br></span></code><code><span id="go7utgvlrp" class="code-snippet_outer"><span id="go7utgvlrp" class="code-snippet__tag"></<span id="go7utgvlrp" class="code-snippet__name">body</span>></span></span></code><code><span id="go7utgvlrp" class="code-snippet_outer"><span id="go7utgvlrp" class="code-snippet__tag"></<span id="go7utgvlrp" 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>實例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 id="go7utgvlrp" class="code-snippet_outer"><span id="go7utgvlrp" class="code-snippet__meta"><!DOCTYPE html></span></span></code><code><span id="go7utgvlrp" class="code-snippet_outer"><span id="go7utgvlrp" class="code-snippet__tag"><<span id="go7utgvlrp" class="code-snippet__name">html</span> <span id="go7utgvlrp" class="code-snippet__attr">lang</span>=<span id="go7utgvlrp" class="code-snippet__string">"en"</span>></span></span></code><code><span id="go7utgvlrp" class="code-snippet_outer"><span id="go7utgvlrp" class="code-snippet__tag"><<span id="go7utgvlrp" class="code-snippet__name">head</span>></span></span></code><code><span id="go7utgvlrp" class="code-snippet_outer"><span id="go7utgvlrp" class="code-snippet__tag"><<span id="go7utgvlrp" class="code-snippet__name">meta</span> <span id="go7utgvlrp" class="code-snippet__attr">charset</span>=<span id="go7utgvlrp" class="code-snippet__string">"UTF-8"</span>></span></span></code><code><span id="go7utgvlrp" class="code-snippet_outer"><span id="go7utgvlrp" class="code-snippet__tag"><<span id="go7utgvlrp" class="code-snippet__name">title</span>></span>項目<span id="go7utgvlrp" class="code-snippet__tag"></<span id="go7utgvlrp" class="code-snippet__name">title</span>></span></span></code><code><span id="go7utgvlrp" class="code-snippet_outer"><span id="go7utgvlrp" class="code-snippet__tag"></<span id="go7utgvlrp" class="code-snippet__name">head</span>></span></span></code><code><span id="go7utgvlrp" class="code-snippet_outer"><span id="go7utgvlrp" class="code-snippet__tag"><<span id="go7utgvlrp" class="code-snippet__name">body</span> <span id="go7utgvlrp" class="code-snippet__attr">style</span>=<span id="go7utgvlrp" class="code-snippet__string">"background-color: aqua;"</span>></span></span></code><code><span id="go7utgvlrp" class="code-snippet_outer"><br></span></code><code><span id="go7utgvlrp" class="code-snippet_outer"> <span id="go7utgvlrp" class="code-snippet__tag"><<span id="go7utgvlrp" class="code-snippet__name">h1</span> <span id="go7utgvlrp" class="code-snippet__attr">id</span>=<span id="go7utgvlrp" class="code-snippet__string">"id01"</span>></span>My First Page<span id="go7utgvlrp" class="code-snippet__tag"></<span id="go7utgvlrp" class="code-snippet__name">h1</span>></span></span></code><code><span id="go7utgvlrp" class="code-snippet_outer"> <span id="go7utgvlrp" class="code-snippet__tag"><<span id="go7utgvlrp" class="code-snippet__name">p</span> <span id="go7utgvlrp" class="code-snippet__attr">id</span>=<span id="go7utgvlrp" class="code-snippet__string">"id02"</span>></span><span id="go7utgvlrp" class="code-snippet__tag"></<span id="go7utgvlrp" class="code-snippet__name">p</span>></span></span></code><code><span id="go7utgvlrp" class="code-snippet_outer"><br></span></code><code><span id="go7utgvlrp" class="code-snippet_outer"> <span id="go7utgvlrp" class="code-snippet__tag"><<span id="go7utgvlrp" class="code-snippet__name">script</span>></span></span></code><code><span id="go7utgvlrp" class="code-snippet_outer"> <span id="go7utgvlrp" class="code-snippet__built_in">document</span>.getElementById(<span id="go7utgvlrp" class="code-snippet__string">"id02"</span>).innerHTML = <span id="go7utgvlrp" class="code-snippet__built_in">document</span>.getElementById(<span id="go7utgvlrp" class="code-snippet__string">"id01"</span>).firstChild.nodeValue;</span></code><code><span id="go7utgvlrp" class="code-snippet_outer"><span id="go7utgvlrp" class="code-snippet__tag"></<span id="go7utgvlrp" class="code-snippet__name">script</span>></span></span></code><code><span id="go7utgvlrp" class="code-snippet_outer"><br></span></code><code><span id="go7utgvlrp" class="code-snippet_outer"><span id="go7utgvlrp" class="code-snippet__tag"></<span id="go7utgvlrp" class="code-snippet__name">body</span>></span></span></code><code><span id="go7utgvlrp" class="code-snippet_outer"><span id="go7utgvlrp" class="code-snippet__tag"></<span id="go7utgvlrp" 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>實例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 id="go7utgvlrp" class="code-snippet_outer"><span id="go7utgvlrp" class="code-snippet__meta"><!DOCTYPE html></span></span></code><code><span id="go7utgvlrp" class="code-snippet_outer"><span id="go7utgvlrp" class="code-snippet__tag"><<span id="go7utgvlrp" class="code-snippet__name">html</span> <span id="go7utgvlrp" class="code-snippet__attr">lang</span>=<span id="go7utgvlrp" class="code-snippet__string">"en"</span>></span></span></code><code><span id="go7utgvlrp" class="code-snippet_outer"><span id="go7utgvlrp" class="code-snippet__tag"><<span id="go7utgvlrp" class="code-snippet__name">head</span>></span></span></code><code><span id="go7utgvlrp" class="code-snippet_outer"><span id="go7utgvlrp" class="code-snippet__tag"><<span id="go7utgvlrp" class="code-snippet__name">meta</span> <span id="go7utgvlrp" class="code-snippet__attr">charset</span>=<span id="go7utgvlrp" class="code-snippet__string">"UTF-8"</span>></span></span></code><code><span id="go7utgvlrp" class="code-snippet_outer"><span id="go7utgvlrp" class="code-snippet__tag"><<span id="go7utgvlrp" class="code-snippet__name">title</span>></span>項目<span id="go7utgvlrp" class="code-snippet__tag"></<span id="go7utgvlrp" class="code-snippet__name">title</span>></span></span></code><code><span id="go7utgvlrp" class="code-snippet_outer"><span id="go7utgvlrp" class="code-snippet__tag"></<span id="go7utgvlrp" class="code-snippet__name">head</span>></span></span></code><code><span id="go7utgvlrp" class="code-snippet_outer"><span id="go7utgvlrp" class="code-snippet__tag"><<span id="go7utgvlrp" class="code-snippet__name">body</span> <span id="go7utgvlrp" class="code-snippet__attr">style</span>=<span id="go7utgvlrp" class="code-snippet__string">"background-color: aqua;"</span>></span></span></code><code><span id="go7utgvlrp" class="code-snippet_outer"> <span id="go7utgvlrp" class="code-snippet__tag"><<span id="go7utgvlrp" class="code-snippet__name">h1</span> <span id="go7utgvlrp" class="code-snippet__attr">id</span>=<span id="go7utgvlrp" class="code-snippet__string">"id01"</span>></span>My First Page<span id="go7utgvlrp" class="code-snippet__tag"></<span id="go7utgvlrp" class="code-snippet__name">h1</span>></span></span></code><code><span id="go7utgvlrp" class="code-snippet_outer"> <span id="go7utgvlrp" class="code-snippet__tag"><<span id="go7utgvlrp" class="code-snippet__name">p</span> <span id="go7utgvlrp" class="code-snippet__attr">id</span>=<span id="go7utgvlrp" class="code-snippet__string">"id02"</span>></span>Hello!<span id="go7utgvlrp" class="code-snippet__tag"></<span id="go7utgvlrp" class="code-snippet__name">p</span>></span></span></code><code><span id="go7utgvlrp" class="code-snippet_outer"><br></span></code><code><span id="go7utgvlrp" class="code-snippet_outer"> <span id="go7utgvlrp" class="code-snippet__tag"><<span id="go7utgvlrp" class="code-snippet__name">script</span>></span></span></code><code><span id="go7utgvlrp" class="code-snippet_outer"> <span id="go7utgvlrp" class="code-snippet__built_in">document</span>.getElementById(<span id="go7utgvlrp" class="code-snippet__string">"id02"</span>).innerHTML = <span id="go7utgvlrp" class="code-snippet__built_in">document</span>.getElementById(<span id="go7utgvlrp" class="code-snippet__string">"id01"</span>).childNodes[<span id="go7utgvlrp" class="code-snippet__number">0</span>].nodeValue;</span></code><code><span id="go7utgvlrp" class="code-snippet_outer"><span id="go7utgvlrp" class="code-snippet__tag"></<span id="go7utgvlrp" class="code-snippet__name">script</span>></span></span></code><code><span id="go7utgvlrp" class="code-snippet_outer"><br></span></code><code><span id="go7utgvlrp" class="code-snippet_outer"><span id="go7utgvlrp" class="code-snippet__tag"></<span id="go7utgvlrp" class="code-snippet__name">body</span>></span></span></code><code><span id="go7utgvlrp" class="code-snippet_outer"><span id="go7utgvlrp" class="code-snippet__tag"></<span id="go7utgvlrp" 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 根節(jié)點</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">有兩個特殊屬性允許訪問完整文檔:</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 - 文檔主體</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 id="go7utgvlrp" class="code-snippet_outer"><span id="go7utgvlrp" class="code-snippet__meta"><!DOCTYPE html></span></span></code><code><span id="go7utgvlrp" class="code-snippet_outer"><span id="go7utgvlrp" class="code-snippet__tag"><<span id="go7utgvlrp" class="code-snippet__name">html</span> <span id="go7utgvlrp" class="code-snippet__attr">lang</span>=<span id="go7utgvlrp" class="code-snippet__string">"en"</span>></span></span></code><code><span id="go7utgvlrp" class="code-snippet_outer"><span id="go7utgvlrp" class="code-snippet__tag"><<span id="go7utgvlrp" class="code-snippet__name">head</span>></span></span></code><code><span id="go7utgvlrp" class="code-snippet_outer"><span id="go7utgvlrp" class="code-snippet__tag"><<span id="go7utgvlrp" class="code-snippet__name">meta</span> <span id="go7utgvlrp" class="code-snippet__attr">charset</span>=<span id="go7utgvlrp" class="code-snippet__string">"UTF-8"</span>></span></span></code><code><span id="go7utgvlrp" class="code-snippet_outer"><span id="go7utgvlrp" class="code-snippet__tag"><<span id="go7utgvlrp" class="code-snippet__name">title</span>></span>項目<span id="go7utgvlrp" class="code-snippet__tag"></<span id="go7utgvlrp" class="code-snippet__name">title</span>></span></span></code><code><span id="go7utgvlrp" class="code-snippet_outer"><span id="go7utgvlrp" class="code-snippet__tag"></<span id="go7utgvlrp" class="code-snippet__name">head</span>></span></span></code><code><span id="go7utgvlrp" class="code-snippet_outer"><span id="go7utgvlrp" class="code-snippet__tag"><<span id="go7utgvlrp" class="code-snippet__name">body</span> <span id="go7utgvlrp" class="code-snippet__attr">style</span>=<span id="go7utgvlrp" class="code-snippet__string">"background-color: aqua;"</span>></span></span></code><code><span id="go7utgvlrp" class="code-snippet_outer"><br></span></code><code><span id="go7utgvlrp" class="code-snippet_outer"><span id="go7utgvlrp" class="code-snippet__tag"><<span id="go7utgvlrp" class="code-snippet__name">h1</span> <span id="go7utgvlrp" class="code-snippet__attr">id</span>=<span id="go7utgvlrp" class="code-snippet__string">"id01"</span>></span>我的第一個頁面<span id="go7utgvlrp" class="code-snippet__tag"></<span id="go7utgvlrp" class="code-snippet__name">h1</span>></span></span></code><code><span id="go7utgvlrp" class="code-snippet_outer"><span id="go7utgvlrp" class="code-snippet__tag"><<span id="go7utgvlrp" class="code-snippet__name">p</span> <span id="go7utgvlrp" class="code-snippet__attr">id</span>=<span id="go7utgvlrp" class="code-snippet__string">"id02"</span>></span><span id="go7utgvlrp" class="code-snippet__tag"></<span id="go7utgvlrp" class="code-snippet__name">p</span>></span></span></code><code><span id="go7utgvlrp" class="code-snippet_outer"><br></span></code><code><span id="go7utgvlrp" class="code-snippet_outer"><span id="go7utgvlrp" class="code-snippet__tag"><<span id="go7utgvlrp" class="code-snippet__name">script</span>></span></span></code><code><span id="go7utgvlrp" class="code-snippet_outer"><span id="go7utgvlrp" class="code-snippet__built_in">document</span>.getElementById(<span id="go7utgvlrp" class="code-snippet__string">"id02"</span>).innerHTML = <span id="go7utgvlrp" class="code-snippet__built_in">document</span>.getElementById(<span id="go7utgvlrp" class="code-snippet__string">"id01"</span>).childNodes[<span id="go7utgvlrp" class="code-snippet__number">0</span>].nodeValue;</span></code><code><span id="go7utgvlrp" class="code-snippet_outer"><span id="go7utgvlrp" class="code-snippet__tag"></<span id="go7utgvlrp" class="code-snippet__name">script</span>></span></span></code><code><span id="go7utgvlrp" class="code-snippet_outer"><br></span></code><code><span id="go7utgvlrp" class="code-snippet_outer"><br></span></code><code><span id="go7utgvlrp" class="code-snippet_outer"><span id="go7utgvlrp" class="code-snippet__tag"></<span id="go7utgvlrp" class="code-snippet__name">body</span>></span></span></code><code><span id="go7utgvlrp" class="code-snippet_outer"><span id="go7utgvlrp" class="code-snippet__tag"></<span id="go7utgvlrp" 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 - 完整的文檔</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 id="go7utgvlrp" class="code-snippet_outer"><span id="go7utgvlrp" class="code-snippet__meta"><!DOCTYPE html></span></span></code><code><span id="go7utgvlrp" class="code-snippet_outer"><span id="go7utgvlrp" class="code-snippet__tag"><<span id="go7utgvlrp" class="code-snippet__name">html</span> <span id="go7utgvlrp" class="code-snippet__attr">lang</span>=<span id="go7utgvlrp" class="code-snippet__string">"en"</span>></span></span></code><code><span id="go7utgvlrp" class="code-snippet_outer"> <span id="go7utgvlrp" class="code-snippet__tag"><<span id="go7utgvlrp" class="code-snippet__name">head</span>></span></span></code><code><span id="go7utgvlrp" class="code-snippet_outer"> <span id="go7utgvlrp" class="code-snippet__tag"><<span id="go7utgvlrp" class="code-snippet__name">meta</span> <span id="go7utgvlrp" class="code-snippet__attr">charset</span>=<span id="go7utgvlrp" class="code-snippet__string">"UTF-8"</span>></span></span></code><code><span id="go7utgvlrp" class="code-snippet_outer"> <span id="go7utgvlrp" class="code-snippet__tag"><<span id="go7utgvlrp" class="code-snippet__name">title</span>></span>項目<span id="go7utgvlrp" class="code-snippet__tag"></<span id="go7utgvlrp" class="code-snippet__name">title</span>></span></span></code><code><span id="go7utgvlrp" class="code-snippet_outer"> <span id="go7utgvlrp" class="code-snippet__tag"></<span id="go7utgvlrp" class="code-snippet__name">head</span>></span></span></code><code><span id="go7utgvlrp" class="code-snippet_outer"> <span id="go7utgvlrp" class="code-snippet__tag"><<span id="go7utgvlrp" class="code-snippet__name">body</span> <span id="go7utgvlrp" class="code-snippet__attr">style</span>=<span id="go7utgvlrp" class="code-snippet__string">"background-color: aqua;"</span>></span></span></code><code><span id="go7utgvlrp" class="code-snippet_outer"> <span id="go7utgvlrp" class="code-snippet__tag"><<span id="go7utgvlrp" class="code-snippet__name">p</span>></span>Hello World!<span id="go7utgvlrp" class="code-snippet__tag"></<span id="go7utgvlrp" class="code-snippet__name">p</span>></span></span></code><code><span id="go7utgvlrp" class="code-snippet_outer"> <span id="go7utgvlrp" class="code-snippet__tag"><<span id="go7utgvlrp" class="code-snippet__name">div</span>></span></span></code><code><span id="go7utgvlrp" class="code-snippet_outer"> <span id="go7utgvlrp" class="code-snippet__tag"><<span id="go7utgvlrp" class="code-snippet__name">p</span>></span>The DOM is very useful!<span id="go7utgvlrp" class="code-snippet__tag"></<span id="go7utgvlrp" class="code-snippet__name">p</span>></span></span></code><code><span id="go7utgvlrp" class="code-snippet_outer"> <span id="go7utgvlrp" class="code-snippet__tag"><<span id="go7utgvlrp" class="code-snippet__name">p</span>></span>This example demonstrates the <span id="go7utgvlrp" class="code-snippet__tag"><<span id="go7utgvlrp" class="code-snippet__name">b</span>></span>document.documentElement<span id="go7utgvlrp" class="code-snippet__tag"></<span id="go7utgvlrp" class="code-snippet__name">b</span>></span> property.<span id="go7utgvlrp" class="code-snippet__tag"></<span id="go7utgvlrp" class="code-snippet__name">p</span>></span></span></code><code><span id="go7utgvlrp" class="code-snippet_outer"> <span id="go7utgvlrp" class="code-snippet__tag"></<span id="go7utgvlrp" class="code-snippet__name">div</span>></span></span></code><code><span id="go7utgvlrp" class="code-snippet_outer"><br></span></code><code><span id="go7utgvlrp" class="code-snippet_outer"> <span id="go7utgvlrp" class="code-snippet__tag"><<span id="go7utgvlrp" class="code-snippet__name">script</span>></span></span></code><code><span id="go7utgvlrp" class="code-snippet_outer"> alert(<span id="go7utgvlrp" class="code-snippet__built_in">document</span>.documentElement.innerHTML);</span></code><code><span id="go7utgvlrp" class="code-snippet_outer"><span id="go7utgvlrp" class="code-snippet__tag"></<span id="go7utgvlrp" class="code-snippet__name">script</span>></span></span></code><code><span id="go7utgvlrp" class="code-snippet_outer"><br></span></code><code><span id="go7utgvlrp" class="code-snippet_outer"><span id="go7utgvlrp" class="code-snippet__tag"></<span id="go7utgvlrp" class="code-snippet__name">body</span>></span></span></code><code><span id="go7utgvlrp" class="code-snippet_outer"><span id="go7utgvlrp" class="code-snippet__tag"></<span id="go7utgvlrp" 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 屬性</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屬性指定一個節(jié)點的名稱，nodeName 是只讀的。</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 是只讀的。</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 一個元素節(jié)點的節(jié)點名稱和標簽名稱相同。</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">一個屬性節(jié)點的節(jié)點名稱是屬性名。</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">一個文本節(jié)點的nodeName總是 #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">文檔的節(jié)點名稱總是 #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 id="go7utgvlrp" class="code-snippet_outer"><span id="go7utgvlrp" class="code-snippet__tag"><<span id="go7utgvlrp" class="code-snippet__name">h1</span> <span id="go7utgvlrp" class="code-snippet__attr">id</span>=<span id="go7utgvlrp" class="code-snippet__string">"id01"</span>></span>My First Page<span id="go7utgvlrp" class="code-snippet__tag"></<span id="go7utgvlrp" class="code-snippet__name">h1</span>></span></span></code><code><span id="go7utgvlrp" class="code-snippet_outer"><span id="go7utgvlrp" class="code-snippet__tag"><<span id="go7utgvlrp" class="code-snippet__name">p</span> <span id="go7utgvlrp" class="code-snippet__attr">id</span>=<span id="go7utgvlrp" class="code-snippet__string">"id02"</span>></span><span id="go7utgvlrp" class="code-snippet__tag"></<span id="go7utgvlrp" class="code-snippet__name">p</span>></span></span></code><code><span id="go7utgvlrp" class="code-snippet_outer"><br></span></code><code><span id="go7utgvlrp" class="code-snippet_outer"><span id="go7utgvlrp" class="code-snippet__tag"><<span id="go7utgvlrp" class="code-snippet__name">script</span>></span></span></code><code><span id="go7utgvlrp" class="code-snippet_outer"><span id="go7utgvlrp" class="code-snippet__built_in">document</span>.getElementById(<span id="go7utgvlrp" class="code-snippet__string">"id02"</span>).innerHTML = <span id="go7utgvlrp" class="code-snippet__built_in">document</span>.getElementById(<span id="go7utgvlrp" class="code-snippet__string">"id01"</span>).nodeName;</span></code><code><span id="go7utgvlrp" class="code-snippet_outer"><span id="go7utgvlrp" class="code-snippet__tag"></<span id="go7utgvlrp" 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總是包含HTML元素的大寫標簽名稱。</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 屬性</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 屬性指定節(jié)點的值。素節(jié)點的節(jié)點值是 undefined，文本節(jié)點的節(jié)點是文本本身，屬性節(jié)點的節(jié)點值是屬性值。</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 屬性</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 屬性返回節(jié)點類型. nodeType 是只讀的。</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 id="go7utgvlrp" class="code-snippet_outer"><span id="go7utgvlrp" class="code-snippet__tag"><<span id="go7utgvlrp" class="code-snippet__name">script</span>></span></span></code><code><span id="go7utgvlrp" class="code-snippet_outer"><span id="go7utgvlrp" class="code-snippet__built_in">document</span>.getElementById(<span id="go7utgvlrp" class="code-snippet__string">"id02"</span>).innerHTML = <span id="go7utgvlrp" class="code-snippet__built_in">document</span>.getElementById(<span id="go7utgvlrp" class="code-snippet__string">"id01"</span>).nodeType;</span></code><code><span id="go7utgvlrp" class="code-snippet_outer"><span id="go7utgvlrp" class="code-snippet__tag"></<span id="go7utgvlrp" 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: 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