<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01//EN"
"http://www.w3.org/TR/html4/strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" lang="en">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>js01_hello</title>
<meta name="author" content="Administrator" />
<script type="text/javascript">
/**
* 以下等于为String扩展了一个trim的方法来去除空格
*/
String.prototype.trim = function() {
//js的正则表达式和java很类似，区别就是js是使用//
return this.replace(/(^\s+)|(\s+$)/g,"");
}
var str = " aaaa ";
alert("|"+str.trim()+"|");
</script>
</head>
<body>
</body>
</html>
