1.通过substring截取。
function getnum()
{
var num = 22.123456;
var result = num.substring(0,s.indexOf(".")+3);
alert(result);
}2. 正则表达式。
function getnum()
{
var num = 22.123456;
var aNew;
var re = /([0-9]+\.[0-9]{2})[0-9]*/;
aNew = num.replace(re,"$1");
alert(aNew);
}3.数据类型保留上。
function getnum()
{
var num=22.123456;
alert( Math.round(num*100)/100);
}4.toFixed方法
alert(num.toFixed(2));
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