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var html=document.documentElement;
alert(html==document.childNodes[0]);//false alert(html==document.firstChild);//false
闭关修行中......
你查一下你的测试HTML文档是否指定了DOCTYPE, 如果是, document.childNodes[0]返回的是DOCTYPE对象, 结果当然是false.
你可以这样做看为什么.alert(document.childNodes[0]) //[object DOCTYPE]alert(document.documentElement) //[object HTMLHtml]
![[Web front-end] Node.js quick start](https://img.php.cn/upload/course/000/000/067/662b5d34ba7c0227.png)
你查一下你的测试HTML文档是否指定了DOCTYPE, 如果是, document.childNodes[0]返回的是DOCTYPE对象, 结果当然是false.
你可以这样做看为什么.
alert(document.childNodes[0]) //[object DOCTYPE]
alert(document.documentElement) //[object HTMLHtml]