Posted in Javascript onOctober 18, 2013
例如:
12345格式化为12,345.00
12345.6格式化为12,345.60
12345.67格式化为 12,345.67
只留两位小数。
回来后写了个格式化函数。可以控制小数位数,自动四舍五入。 代码如下:
function fmoney(s, n) { n = n > 0 && n <= 20 ? n : 2; s = parseFloat((s + "").replace(/[^\d\.-]/g, "")).toFixed(n) + ""; var l = s.split(".")[0].split("").reverse(), r = s.split(".")[1]; t = ""; for (i = 0; i < l.length; i++) { t += l[i] + ((i + 1) % 3 == 0 && (i + 1) != l.length ? "," : ""); } return t.split("").reverse().join("") + "." + r; }
调用:fmoney("12345.675910", 3),返回12,345.676
还原函数:
function rmoney(s) { return parseFloat(s.replace(/[^\d\.-]/g, "")); }
示例(可保存一下代码为html文件,运行查看效果):
<SCRIPT> function fmoney(s, n) { n = n > 0 && n <= 20 ? n : 2; s = parseFloat((s + "").replace(/[^\d\.-]/g, "")).toFixed(n) + ""; var l = s.split(".")[0].split("").reverse(), r = s.split(".")[1]; t = ""; for (i = 0; i < l.length; i++) { t += l[i] + ((i + 1) % 3 == 0 && (i + 1) != l.length ? "," : ""); } return t.split("").reverse().join("") + "." + r; } function rmoney(s) { return parseFloat(s.replace(/[^\d\.-]/g, "")); } function g(id) { return document.getElementById(id); } window.onload = function() { var num, txt = g("txt"), txt2 = g("txt2"), btn = g("btn"), btn2 = g("btn2"), span = g("span"); btn.onclick = function() { num = parseInt(g("num").value); txt.value = fmoney(txt.value, num); txt2.value = fmoney(txt2.value, num); }; btn2.onclick = function() { num = parseInt(g("num").value); span.innerHTML = "=" + fmoney(rmoney(txt.value) + rmoney(txt2.value), num); }; }; </SCRIPT> 小数点位数: <select id="num"> <option value="2">2</option> <option value="3">3</option> <option value="4">4</option> <option value="5">5</option> </select> <input type="text" id="txt" value="12345.675910"> + <input type="text" id="txt2" value="1223"> <span id="span"></span> <br> <input type="button" id="btn" value="格式化"> <input type="button" id="btn2" value="相加">
附:
/* * formatMoney(s,type) * 功能:金额按千位逗号分割 * 参数:s,需要格式化的金额数值. * 参数:type,判断格式化后的金额是否需要小数位. * 返回:返回格式化后的数值字符串. */ function formatMoney(s, type) { if (/[^0-9\.]/.test(s)) return "0"; if (s == null || s == "") return "0"; s = s.toString().replace(/^(\d*)$/, "$1."); s = (s + "00").replace(/(\d*\.\d\d)\d*/, "$1"); s = s.replace(".", ","); var re = /(\d)(\d{3},)/; while (re.test(s)) s = s.replace(re, "$1,$2"); s = s.replace(/,(\d\d)$/, ".$1"); if (type == 0) {// 不带小数位(默认是有小数位) var a = s.split("."); if (a[1] == "00") { s = a[0]; } } return s; } /* * 通用DateAdd(interval,number,date) 功能:实现javascript的日期相加功能. * 参数:interval,字符串表达式,表示要添加的时间间隔. 参数:number,数值表达式,表示要添加的时间间隔的个数. 参数:date,时间对象. * 返回:新的时间对象. var now = new Date(); var newDate = DateAdd("day",5,now); * author:devinhua(从○开始) update:2010-5-5 20:35 */ function DateAdd(interval, number, date) { if (date == null) return ""; switch (interval) { case "day": date = new Date(date); date = date.valueOf(); date += number * 24 * 60 * 60 * 1000; date = new Date(date); return date; break; default: return ""; break; } }
JS格式化数字金额用逗号隔开保留两位小数
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