lang
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        HTML DOM lang 属性
定义和用法
lang 属性设置或返回元素的语言。
语法
		HTMLElementObject.lang=language-code 
	
浏览器支持
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所有主要浏览器都支持 lang 属性
实例
返回元素的语言:
		<html>
<body id="myid" lang="en-us">
<script>
var x=document.getElementsByTagName(‘body‘)[0];
document.write("Body language: " + x.lang);
document.write("<br>");
document.write("An alternate way: ");
document.write(document.getElementById(‘myid‘).lang);
</script>
</body>
</html>
	<body id="myid" lang="en-us">
<script>
var x=document.getElementsByTagName(‘body‘)[0];
document.write("Body language: " + x.lang);
document.write("<br>");
document.write("An alternate way: ");
document.write(document.getElementById(‘myid‘).lang);
</script>
</body>
</html>
输出结果:
		Body language: en-us
An alternate way: en-us
An alternate way: en-us