/** * [number_format 参数说明：] * @param {[type]} number [number：要格式化的数字] * @param {[type]} decimals [decimals：保留几位小数] * @param {[type]} dec_point [dec_point：小数点符号] * @param {[type]} thousands_sep [thousands_sep：千分位符号] * @param {[type]} roundtag [roundtag:舍入参数，默认 "ceil" 向上取,"floor"向下取,"round" 四舍五入] * @return {[type]} [description] * */function number_format(number, decimals, dec_point, thousands_sep, roundtag) { number = (number + '').replace(/[^0-9+-Ee.]/g, ''); roundtag = roundtag || "ceil"; //"ceil","floor","round" 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); console.log(); return '' + parseFloat(Math[roundtag](parseFloat((n * k).toFixed(prec * 2))).toFixed(prec * 2)) / 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);}console.log(number_format(2, 2, ".", ",")) //"2.00"console.log(number_format(3.7, 2, ".", ",")) //"3.70"console.log(number_format(3, 0, ".", ",")) //"3"console.log(number_format(9.0312, 2, ".", ",")) //"9.03"console.log(number_format(9.00, 2, ".", ",")) //"9.00"console.log(number_format(39.715001, 2, ".", ",", "floor")) //"39.71"console.log(number_format(9.7, 2, ".", ",")) //"9.70"console.log(number_format(39.7, 2, ".", ",")) //"39.70"console.log(number_format(9.70001, 2, ".", ",")) //"9.71"console.log(number_format(39.70001, 2, ".", ",")) //"39.71"console.log(number_format(9996.03, 2, ".", ",")) //"9996.03"console.log(number_format(1.797, 3, ".", ",", "floor")) //"1.797"
参数有点多，你可以根据你自己的需求去修改。
推荐的类库 Numeral.js 和 accounting.js
Numeral.js
一个用于格式化和操作数字的JavaScript库。数字可以被格式化为货币，百分比，时间，几个小数位数，千分位等等。 您也可以随时创建自定义格式。
官网及文档：
GitHub：
accounting.js
一个轻量级的JavaScript库，用于格式化数字，金额和货币等。
官网及文档：
GitHub：
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