Question

js中将数字格式化为小数点后保留2位怎么弄

Answer 1

如果保留两位小数时需要四舍五入：

var num=3.446242342;
num=num.toFixed(2);

如果不希望四舍五入，则：

var num=3.446242342;
num=parseInt(num*100)/100;

Answer 2

保留两位好像是这样吧
var a=3.14159;
alert(a.toFixed(2));
返回的是3.14
但是只有ie5.5以上的版本才支持。
原文：
https://transcoder.baiducontent.com/from=1086k/bd_page_type=1/ssid=0/uid=0/pu=usm%400%2Csz%40320_1002%2Cta%40iphone_2_7.1_2_12137.1/baiduid=F8AB2EF2853124AF3EE357C2BF38A6D1/w=0_10_/t=iphone/l=3/tc?ref=www_iphone&lid=15266241908899631665&order=1&fm=alop&h5ad=1&srd=1&dict=32&tj=www_normal_1_0_10_title&url_mf_score=3&vit=osres&m=8&cltj=cloud_title&asres=1&title=javascript%E5%AE%9E%E7%8E%B0%E4%BF%9D%E7%95%99%E4%B8%A4%E4%BD%8D%E5%B0%8F%E6%95%B0%E7%9A%84%E5%A4%9A%E7%A7%8D%E6%96%B9%E6%B3%95_jav..._%E8%84%9A%E6%9C%AC%E4%B9%8B%E5%AE%B6&w_qd=IlPT2AEptyoA_yivD93kGjU5O6oatZVLoktZsPCtdudVGvln&tcplug=1&sec=26149&di=0e45c5cfb6aa3202&bdenc=1&tch=124.0.50.166.0.0&nsrc=IlPT2AEptyoA_yixCFOxXnANedT62v3IEQGG_yRWR7f5o5ijva02IMRuWzDzNTrIBZ_fcTbKvsVJbK&eqid=d3dc9621d324d000100000005a32809a&wd=&clk_info=%7B%22srcid%22%3A1599%2C%22tplname%22%3A%22www_normal%22%2C%22t%22%3A1513259165629%2C%22xpath%22%3A%22div-a-h3%22%7D

Answer 3

var number;
if(number.contain(".")){
number = number.split[0]+number.split('.')[1].subString(0,2);
}else{
number + = ".00";
}

Answer 4

/**

* 小数位数保留

* value 需要操作的小数

* digit 保留的位数,若不可用则为 2

*/

function decimalReservation(value,digit){

digit=isNaN(digit)?2:digit;

if(digit<0){

value = value* Math.pow(10,digit);

digit=-digit;

}

var strValue=parseInt(value*Math.pow(10,digit)).toString();

return parseFloat(parseInt(value)+"."+strValue.substring(strValue.length-digit));

}