1. 字符串法

function get()
{

 var s = 22.127456 + “”;

 var str = s.substring(0,s.indexOf(“.”) + 3);

 alert(str);

}

2.正则表达式法

function get()

{

var a = “23.456322″;

var aNew;

var re = /([0-9]+\.[0-9]{2})[0-9]*/;

aNew = a.replace(re,”$1″);

alert(aNew);

}

3.round法

function get()

{

var num=22.127456;

alert( Math.round(num*100)/100);

}

4.toFixed

function get()

{

var num=22.127456;

alert( num.toFixed(2));

}