<!DOCTYPE html>
<html>
<head>
<script src="jquery-1.8.3.min.js"></script>
</head>
<body>
<div id='labelText' style='color:black;line-height:1.2;white-space:nowrap;top:0px;left:0px;position:fixed;display:block;visibility:visible;'>
</div>
<script>
var str="12,,009sss ah ah";
str = str.substring(0,str.length);
$("#labelText").css({
"font-size": "12px",
"font-family": "Microsoft YaHei"
}).html(str);
var width = $("#labelText").width();
alert(width);
</script>
</body>
</html>