Summary of JavaScript methods for obtaining the number of decimal places

这篇文章主要介绍了javascript 取小数点后几位几种方法总结的相关资料,这里提供了四种方法，帮助大家整理，需要的朋友可以参考下

javascript 取小数点后几位方法总结

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。

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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