function numberFormat (number, decimals, decPoint, thousandsSep, roundtag) { ?/* ?????* 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 ?????* roundtag:舍入参数，默认 ‘ceil‘ 向上取,‘floor‘向下取,‘round‘ 四舍五入 ?????* */ ?number = (number + ‘‘).replace(/[^0-9+-Ee.]/g, ‘‘) ?roundtag = roundtag || ‘ceil‘ // ‘ceil‘,‘floor‘,‘round‘ ?var n = !isFinite(+number) ? 0 : +number ?var prec = !isFinite(+decimals) ? 0 : Math.abs(decimals) ?var sep = (typeof thousandsSep === ‘undefined‘) ? ‘,‘ : thousandsSep ?var dec = (typeof decPoint === ‘undefined‘) ? ‘.‘ : decPoint ?var s = ‘‘ ?var 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(numberFormat(100000.00, 2, ‘.‘, ‘,‘)) // ‘100,000.00‘js实现金额千分位显示
原文地址：https://www.cnblogs.com/cuixiaozhen/p/10112525.html