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function get()
{
    var s = 22.127456 + "";
    var str = s.substring(0,s.indexOf(".") + 3);
    alert(str);
}
2. ÕýÔò±í´ïʽЧ¹û²»´í
<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. Ëû¾Í±È½Ï´ÏÃ÷ÁË.....
<script>
var num=22.127456;
alert( Math.round(num*100)/100);
</script>
4.»áÓÃÐÂÏʶ«Î÷µÄÅóÓÑ....... µ«ÊÇÐèÒª IE5.5+²ÅÖ§³Ö¡£
 <script>
var num=22.127456;
alert( num.toFixed(2));
</script>