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<html>
<body>
<script type="text/javascript">
var str1 = /(\w+)\s*/gi,str2 = /\s*(\w*)\s*(\w*)\s*(\w*)/gi;
name = "Doe, Jo h n";
document.write(name.replace(str1,str2);
</script>
</body>
</html>
var name = "Doe, Jo h n";
document.write(name.replace(/([^\,]+)\,([^\,]+)/,"$2,$1"));
var name = "Doe, Jo h n";
document.write(name.split(",").reverse().join());
<html>
<body>
<script type="text/javascript">
name = "Doe, Jo h n";
alert( name.split(',').reverse() )
</script>
</body>
</html>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>无标题文档</title>
<script type="text/javascript">
var str1 = /(\w+)\s*/gi;
var str2 = /\s*(\w*)\s*(\w*)\s*(\w*)/gi;
var name = "Doe, Jo h n";
document.write(name.replace(str1,str2));
</script>
</head>
<body>
</body>
</html>