function number_format(number, decimals, dec_point, thousands_sep) {  /*

    • 参数说明:
    • number:要格式化的数字
    • decimals:保留几位小数
    • dec_point:小数点符号
    • thousands_sep:千分位符号
    • */ number = (number + ‘’).replace(/[^0-9+-Ee.]/g, ‘’);

      var n = !isFinite(+number) ? 0 : +number,

      prec = !isFinite(+decimals) ? 2 : Math.abs(decimals),

      sep = (typeof thousands_sep === ‘undefined’) ? ‘,’ : thousands_sep,

      dec = (typeof dec_point === ‘undefined’) ? ‘.’ : dec_point,

      s = ‘’,

      toFixedFix = function(n, prec) {

      var k = Math.pow(10, prec);

      return ‘’ + Math.ceil(n * k) / k;

      };

    s = (prec ? toFixedFix(n, prec) : ‘’ + Math.round(n)).split(‘.’);

    var re = /(-?\d+)(\d{3})/;

    while(re.test(s[0])) {

    1. s[0] = s[0].replace(re, "$1" + sep + "$2");

    }

    if((s[1] || ‘’).length < prec) {

    1. s[1] = s[1] || '';
    2. s[1] += new Array(prec - s[1].length + 1).join('0');

    }

    1.  return s.join(dec);

    }

    金额格式化调用方法:
    console.log(number_format(1000.123, 2)); // 1,000.13
    取消格式化方法:
    function rmoney(e) {
    return parseFloat(e.replace(/[^\d.-]/g, “”));

    }
    取消格式化调用方法:
    rmoney(1,000.13); // 1000.13
    https://www.cnblogs.com/suanshu/p/8820763.html