javascript中带逗号和2位小数的正则表达式格式字符串编号 [英] regex format string number with commas and 2 decimals in javascript

问题描述

我有一个字符串 n，它是一个数字.下面在需要的地方添加逗号，但我也想更改小数位数.它还应该在适当的地方取整.

I have a string n which is a number. The following adds the commas where needed, but I also want to change the number of decimals. It should also round where appropriate.

var parts = n.split(".");
var num = parts[0].replace(/\B(?=(\d{3})+(?!\d))/g, ",") + (parts[1] ? "." + parts[1] : "");

这会将 1234.567 之类的数字转换为 1,234.567.但我需要我的号码看起来像:1,234.57

This turns a number like 1234.567 in to 1,234.567. But I need my number to look like: 1,234.57

我尝试将 parts[1] 转换为数字，然后四舍五入，然后将其连接回来；但这很容易出错.

I tried taking parts[1] and converting to a Number, then rounding, then concatenating it back; but that is error prone.

我怎样才能通过改变我的正则表达式来得到这个结果?谢谢.

How can I get this result by altering my regex? Thanks.

推荐答案

var val = Math.round(Number(n) *100) / 100;
var parts = val.toString().split(".");
var num = parts[0].replace(/\B(?=(\d{3})+(?!\d))/g, ",") + (parts[1] ? "." + parts[1] : "");

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