关于DOM的nodeType
*元素-1<h1id="h1">AnHTMLDocument</h1>
varelement=document.getElementById("h1")
element.nodeType = 1
element.nodeName = H1
element.nodeValue = null
*文本-3
varelement = document.getElementById("h1")
vartext = element.firstChild
text.nodeType = 3
text.nodeName = #text
text.nodeValue = An HTML Document
*文档-9
document.nodeType = 9
document.nodeName = #document
document.nodeValue = null
*属性-2
<input type="button" title="myTitle" id="myId" value="提交"/>
var button = document.getElementById("myId")
var attributes = button.attributes
var second = attributes
second.nodeType = 2
second.nodeName = title
second.nodeValue = myTitle
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