判断是否XML文档
xhtml的昙花一现带来不少问题，它的目的是让html表现得更像xml，所以才叫xhtml。但是出师未捷身先死，我们讨论一下如何判定文档是XML吧。
印象中jQuery对此方法重复实现了许多次，应该比较权威，也说明这判定比较难搞。看jQuery1.42的实现：
var isXML = function(elem){
// documentElement is verified for cases where it doesn't yet exist
// (such as loading iframes in IE - #4833)
var documentElement = (elem ? elem.ownerDocument || elem : 0).documentElement;
return documentElement ? documentElement.nodeName !== "HTML" : false;
};
好，做一个实验：
window.onload = function(){
try{
var doc = document.implementation.createDocument(null, 'HTML', null);//只限标准浏览器，创建一个XML文档
alert(doc.documentElement)
alert(isXML(doc))//应该返回true
}catch(e){
alert("不支持creatDocument方法")
}
}
<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8" />
<meta content="IE=8" http-equiv="X-UA-Compatible"/>
<title>判断是否为XML by 司徒正美 </title>
<script type="text/javascript">
var isXML = function(elem){
var documentElement = (elem ? elem.ownerDocument || elem : 0).documentElement;
return documentElement ? documentElement.nodeName !== "HTML" : false;
};
window.onload = function(){
try{
var doc = document.implementation.createDocument(null, 'HTML', null);
alert(doc.documentElement)
alert(isXML(doc))
}catch(e){
alert("不支持creatDocument方法")
}
}
</script>
</head>
<body>
</body>
</html>
运行代码
另一个实验：
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head>
<
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