js将金额专成每隔3位数加逗号

js将金额专成每隔3位数加逗号，比如 12345.00 转成 12,345.00;

懒得解释具体代码如下

 //分割
     String.prototype.joinByNum = function(num, deli){
         (typeof num  == 'undefined' || num  == 0 || num == '' ) && (num = 3);
         (typeof deli == 'undefined' || deli == '') && (deli = ',');
         var oristr    = this.toString().replace(/^\s*|\s*$|￥|,/g, ''),//去除了一些特殊符号以及空格
             i         = oristr.length - 1,
             lastIndex = oristr.lastIndexOf('.'),
             str       = '',
             index     = 0;
         if(isNaN(oristr)) return oristr;
         (lastIndex !== -1) && (i = lastIndex - 1);
         for (; i >= 0; i--) {
            str = oristr[i] + str;
            if ( i !== 0 && ++index % num === 0) {
                 str = deli + str;
            }
         }
         str += lastIndex !== -1 ? (function(){
             return Number(oristr.substr(lastIndex)).toFixed(2).substr(1);
         })() : '.00';

         return str;
     };

     //钱分割
     Number.prototype.joinByNum = function(){
         return ''.joinByNum.apply(''+ this, arguments);
     };

测试结果：

old:789456123.22
new:789,456,123.22

old:10154344
new:10,154,344.00

貌似num里有个方法，所以又改了下。注意：这个toLocaleString貌似有点问题。比如safari就不会转。

//钱分割
    Number.prototype.fomatMoney = function(){
        var str = this.toLocaleString(),
            arr = str.split('.');
        if (arr.length < 2) {
            str = arr[0]+ '.00';
        }else{
            str = arr[0] + Number(arr[1]).toFixed(2).substr(1);
        }
        return str;
    };
    //钱分割
    String.prototype.fomatMoney = function(){
        var oristr = this.toString();
        if(oristr.indexOf(',') !== -1) return oristr;
        return (0).fomatMoney.apply(Number(oristr), arguments);
    };