如何在添加逗号时更新此jQuery插件/正则表达式以忽略小数？

I'm using the following jQuery plug-in to automatically add commas to a number. The problem is, when a decimal amount (like $1,000.00) is entered, it's changing it to $1,000,.00.

我正在使用以下jQuery插件自动为数字添加逗号。问题是，当输入十进制数量（如$ 1,000.00）时，它会将其更改为$ 1,000，.00。

How can the regex be updated to ignore the decimal point and any characters after it?

如何更新正则表达式以忽略小数点和后面的任何字符？

String.prototype.commas = function() {
    return this.replace(/(.)(?=(.{3})+$)/g,"$1,");
};

$.fn.insertCommas = function () {
    return this.each(function () {
        var $this = $(this);

        $this.val($this.val().replace(/(,| )/g,'').commas());
    });
};

3 个解决方案

#1

seems like a simple fix. Just change the .{3} (any three characters) to [^.]{3} (any non-period three characters)

似乎是一个简单的修复。只需将。{3}（任意三个字符）更改为[^。] {3}（任何非句点三个字符）

String.prototype.commas = function() {
    return this.replace(/(.)(?=([^.]{3})+$)/g,"$1,");
};

EDIT:

编辑：

or better yet:

或者更好的是：

String.prototype.commas = function() {
    return this.replace(/(\d)(?=([^.]{3})+($|[.]))/g,"$1,");
};

#2

Here is an excellent answer already on *: How can I format numbers as money in JavaScript?

这是*上的一个很好的答案：如何在JavaScript中将数字格式化为金钱？

Number.prototype.formatMoney = function(c, d, t){
var n = this, c = isNaN(c = Math.abs(c)) ? 2 : c, d = d == undefined ? "," : d, t = t == undefined ? "." : t, s = n < 0 ? "-" : "", i = parseInt(n = Math.abs(+n || 0).toFixed(c)) + "", j = (j = i.length) > 3 ? j % 3 : 0;
   return s + (j ? i.substr(0, j) + t : "") + i.substr(j).replace(/(\d{3})(?=\d)/g, "$1" + t) + (c ? d + Math.abs(n - i).toFixed(c).slice(2) : "");
 };

Here is a demo: http://jsfiddle.net/H4KLD/

这是一个演示：http：//jsfiddle.net/H4KLD/

#3

This should work as long as there are no more than 3 digits after the .:

只要在。之后不超过3位数，这应该有效。

replace(/(\d)(?=(?:\d{3})+(?:$|\.))/g, "$1,");

#1