1. substring
function get()
{
var s = 22.127456 + "";
var str = s.substring(0,s.indexOf(".") + 3);
alert(str);
}
2. 正则表达式
<script type="text/javascript">
onload = function(){
var a = "23.456322";
var aNew;
var re = /([0-9]+\.[0-9]{2})[0-9]*/;
aNew = a.replace(re,"$1");
alert(aNew);
}
</script>
3. Math.round
<script>
var num=22.127456;
alert(Math.round(num*100)/100);
</script>
4.num.toFixed（需要IE5.5+才支持）
<script>
var num=22.127456;
alert(num.toFixed(2));
</script>
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