Use JavaScript to take the float type decimal point two, example 22.127456 to take 22.13, how to do?

Use JavaScript to take the float type decimal point two, example 22.127456 to take 22.13, how to do?

1. The dumbest way ... [I'll do what I do ...]

1function get ()
2{
3 var s = 22.127456 + "";
4 var str = s.substring (0,s.indexof (".") + 3);
5 alert (str);
6}

2. Regular expression effect is good

1<script type= "Text/javascript" >
2onload = function () {
3 var a = "23.456322";
4 var anew;
5 var re =/([0-9]+/.[ 0-9]{2}) [0-9]*/;
6 anew = A.replace (Re, "$");
7 alert (anew);
8}
9</script>

3. He is more clever ...

1<script>
2var num=22.127456;
3alert (Math.Round (num*100)/100);
4</script>

4. Friends who will use new things .... But we need ie5.5+ to support it.

1 <script>
2var num=22.127456;
3alert (num.tofixed (2));
4</script>