DOM節(jié)點(diǎn)
時(shí)間：2022-02-16 22:28:02 | 來(lái)源：信息時(shí)代
時(shí)間：2022-02-16 22:28:02 來(lái)源：信息時(shí)代
根據(jù)DOM，HTML文檔中的每個(gè)成分都是一個(gè)節(jié)點(diǎn)。
DOM是這樣規(guī)定的：
整個(gè)文檔是一個(gè)文檔節(jié)點(diǎn)
每個(gè)HTML標(biāo)簽是一個(gè)元素節(jié)點(diǎn)
包含在HTML元素中的文本是文本節(jié)點(diǎn)
每一個(gè)HTML屬性是一個(gè)屬性節(jié)點(diǎn)
注釋屬于注釋節(jié)點(diǎn)
Node層次
節(jié)點(diǎn)彼此都有等級(jí)關(guān)系。
HTML文檔中的所有節(jié)點(diǎn)組成了一個(gè)文檔樹(shù)（或節(jié)點(diǎn)樹(shù)）。HTML文檔中的每個(gè)元素、屬性、文本等都代表著樹(shù)中的一個(gè)節(jié)點(diǎn)。樹(shù)起始于文檔節(jié)點(diǎn)，并由此繼續(xù)伸出枝條，直到處于這棵樹(shù)最低級(jí)別的所有文本節(jié)點(diǎn)為止。
請(qǐng)看下面這個(gè)HTML文檔：
DOMTutorialDOMLessonone
Helloworld!
上面所有的節(jié)點(diǎn)彼此間都存在關(guān)系。
除文檔節(jié)點(diǎn)之外的每個(gè)節(jié)點(diǎn)都有父節(jié)點(diǎn)。舉例，和的父節(jié)點(diǎn)是節(jié)點(diǎn)，文本節(jié)點(diǎn)'Helloworld!'的父節(jié)點(diǎn)是節(jié)點(diǎn)。
大部分元素節(jié)點(diǎn)都有子節(jié)點(diǎn)。比方說(shuō)，節(jié)點(diǎn)有一個(gè)子節(jié)點(diǎn)：
節(jié)點(diǎn)。<title>節(jié)點(diǎn)也有一個(gè)子節(jié)點(diǎn)：文本節(jié)點(diǎn)'DOMTutorial'。<br><br>當(dāng)節(jié)點(diǎn)分享同一個(gè)父節(jié)點(diǎn)時(shí)，它們就是同輩（同級(jí)節(jié)點(diǎn)）。比方說(shuō)，<h1>和是同輩，因?yàn)樗鼈兊母腹?jié)點(diǎn)均是<body>節(jié)點(diǎn)。<br><br>節(jié)點(diǎn)也可以擁有后代，后代指某個(gè)節(jié)點(diǎn)的所有子節(jié)點(diǎn)，或者這些子節(jié)點(diǎn)的子節(jié)點(diǎn)，以此類推。比方說(shuō)，所有的文本節(jié)點(diǎn)都是<html>節(jié)點(diǎn)的后代，而第一個(gè)文本節(jié)點(diǎn)是<head>節(jié)點(diǎn)的后代。<br><br>節(jié)點(diǎn)也可以擁有先輩。先輩是某個(gè)節(jié)點(diǎn)的父節(jié)點(diǎn)，或者父節(jié)點(diǎn)的父節(jié)點(diǎn)，以此類推。比方說(shuō)，所有的文本節(jié)點(diǎn)都可把<html>節(jié)點(diǎn)作為先輩節(jié)點(diǎn)。
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