1.最基本的方法
function get()
{
var s = 22.127456 + "";
var str = s.substring(0,s.indexOf(".") + 3);
alert(str);
}
2. 正則表達式效果不錯
<scrīpt type="text/javascrīpt">
onload = function(){
var a = "23.456322";
var aNew;
var re = /([0-9]+/.[0-9]{2})[0-9]*/;
aNew = a.replace(re,"$1");
alert(aNew);
}
</scrīpt>
3.推薦選擇
<scrīpt>
var num=22.127456;
alert( Math.round(num*100)/100);
</scrīpt>
4.需要 IE5.5+才支持。
<scrīpt>
var num=22.127456;
alert( num.toFixed(2));
</scrīpt>