本文主要是介绍用Javascript取float型小数点后两位，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！
用Javascript取float型小数点后两位，例22.127456取成22.13,如何做？
1. 最笨的办法....... [我就怎么干的.........]
1 
function get()
2
{
3
var s = 22.127456 + "";
4 var str = s.substring(0,s.indexOf(".") + 3);
5 alert(str);
6
}
function get()2
{3
var s = 22.127456 + "";4
var str = s.substring(0,s.indexOf(".") + 3);5
alert(str);6
}
2. 正则表达式效果不错
1 < script type = " text/javascript " >
2onload = function () {
3 var a = "23.456322";
4 var aNew;
5
var re = /([0-9]+/.[0-9]{2})[0-9]*/;
6 aNew = a.replace(re,"$1");
7 alert(aNew);
8}
9 </ script >
< script type = " text/javascript " > 2
onload = function () {3
var a = "23.456322";4
var aNew;5
var re = /([0-9]+/.[0-9]{2})[0-9]*/;6
aNew = a.replace(re,"$1");7
alert(aNew);8
} 9
</ script >
3. 他就比较聪明了.....
1 < script >
2 var num = 22.127456 ;
3alert( Math.round(num * 100 ) / 100 );
4 </ script >
< script > 2
var num = 22.127456 ;3
alert( Math.round(num * 100 ) / 100 );4
</ script >
4.会用新鲜东西的朋友....... 但是需要 IE5.5+才支持。
1 < script >
2 var num = 22.127456 ;
3alert( num.toFixed( 2 ));
4 </ script >
< script > 2
var num = 22.127456 ;3
alert( num.toFixed( 2 ));4
</ script >
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