js实现的格式化数字和金额功能简单示例

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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) ? 0 : 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])) {

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

  }

  if ((s[1] || '').length < prec) {

    s[1] = s[1] || '';

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

  }

  return s.join(dec);

}

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var num=number_format(1234567.089, 2, ".", ",");//1,234,567.09

console.log(num);

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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) ? 0 : 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.floor(n * k) / k;

      };

    s = (prec ? toFixedFix(n, prec) : '' + Math.floor(n)).split('.');

    var re = /(-?d+)(d{3})/;

    console.log(s)

    while (re.test(s[0])) {

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

    }

    if ((s[1] || '').length < prec) {

      s[1] = s[1] || '';

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

    }

    return s.join(dec);

}

var num=number_format(1234567.089, 2, ".", ",");//1,234,567.08

console.log(num)