JS----格式化数字，格式化金额

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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);}document.write(number_format(222300400.123456, 2, '.', ','))//222,300,400.13

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