JS格式化数字保留两位小数点示例代码

问题：在JS中格式化数据保留两位小数的函数的多种方法

最好方法：

保留两位好像是这样吧

复制代码代码如下:

var a = 9.39393; 
alert(a.toFixed(2));

说明：

alert(Number.toFixed(9.39393));

返回的是9.39 
但是只有ie5.5以上的版本才支持。

其它方法：

function roundFun(numberRound,roundDigit) //四舍五入，保留位数为roundDigit
 {
 if (numberRound>=0)
 {
 var tempNumber = parseInt((numberRound * Math.pow(10,roundDigit)+0.5))/Math.pow(10,roundDigit);
 return tempNumber;
 }
 else
 {
 numberRound1=-numberRound
 var tempNumber = parseInt((numberRound1 * Math.pow(10,roundDigit)+0.5))/Math.pow(10,roundDigit);
 return -tempNumber;
 }
}

方法二：

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方法三：

复制代码代码如下:

var a=3.1415926; 
a = a.toFixed(2);//保留2位但结果为一个String类型 
a = parseFloat(a);//将结果转换会float 
//用一步的话如下 
a = parseFloat(a.toFixed(2));