方法：1、使用“数值字符串对象.substring(0,数值字符串对象.indexOf(".")+3)”语句；2、使用“Math.round(数值对象*100)/100”语句；3、使用“数值对象.toFixed(2)”语句。
本教程操作环境：windows7系统、javascript1.8.5版、Dell G3电脑。
javascript怎么去掉小数点后两位？例22.123456取成22.12要如何做？
1、通过substring截取
function getnum()
{
var num = 22.123456;
var s=num.toString();
var result = s.substring(0,s.indexOf(".")+3);
alert(result);
}
getnum();
2、正则表达式
function getnum()
{
var num = 22.123456;
var str=num.toString();
var aNew;
var re = /([0-9]+\.[0-9]{2})[0-9]*/;
aNew = str.replace(re,"$1");
alert(aNew);
}
getnum();3、数据类型保留上
function getnum()
{
var num=22.123456;
alert( Math.round(num*100)/100);
}
getnum();4、toFixed方法
var num=22.123456; alert(num.toFixed(2));
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