1. 最笨的办法.......
1 function get()
2 {
3 var s = 22.127456 + "";
4 var str = s.substring(0,s.indexOf(".") + 3);
5 alert(str);
6 }
2. 正则表达式效果不错
1 <script type="text/javascript">
2 onload = function(){
3 var a = "23.456322";
4 var aNew;
5 var re = /([0-9]+/.[0-9]{2})[0-9]*/;
6 aNew = a.replace(re,"$1");
7 alert(aNew);
8 }
9 <script>
3. 他就比较聪明了.....
1 <script>
2 var num=22.127456;
3 alert( Math.round(num*100)/100);
4 <script>
4.会用新鲜东西的朋友....... 但是需要 IE5.5+才支持。
1 <script>
2 var num=22.127456;
3 alert( num.toFixed(2));
4 <script>