Tutorial on how to get two decimal places in js

本文主要和大家分享js如何取小数点后两位方法，Javascript取float型小数点后两位，例22.123456取成22.12,如何做？

1.通过substring截取。

1. function getnum()  
   {  
   var num = 22.123456;  
   var result = num.substring(0,s.indexOf(".")+3);  
   alert(result);  
   }

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2. 正则表达式。

1. function getnum()  
   {  
   var num = 22.123456;  
   var aNew;  
   var re = /([0-9]+\.[0-9]{2})[0-9]*/;  
   aNew = num.replace(re,"$1");  
   alert(aNew);  
   }

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3.数据类型保留上。

1. function getnum()  
   {  
   var num=22.123456;  
   alert( Math.round(num*100)/100);  
   }

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4.toFixed方法

1. alert(num.toFixed(2));

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