js中货币格式化两种方法

直接在Number中扩展货币格式方法

Number.prototype.formatMoney = function (places, symbol, thousand, decimal) {
places = !isNaN(places = Math.abs(places)) ? places : 2;
symbol = symbol !== undefined ? symbol : "$";
thousand = thousand || ",";
decimal = decimal || ".";
var number = this,
negative = number < 0 ? "-" : "",
i = parseInt(number = Math.abs(+number || 0).toFixed(places), 10) + "",
j = (j = i.length) > 3 ? j % 3 : 0;
return symbol + negative + (j ? i.substr(0, j) + thousand : "") + i.substr(j).replace(/(\d{3})(?=\d)/g, "$1" + thousand) + (places ? decimal + Math.abs(number - i).toFixed(places).slice(2) : "");
};
//参数：保留几位小数，货币符号，千位分隔符，小数分隔符
var a=2345.0000.formatMoney(2,‘‘,‘,‘,‘.‘);
console.log(a);

货币格式化方法，不用prototype对Number进行拓展的版本

    formatMoney(number, places, symbol, thousand, decimal) {
number = number || 0;
places = !isNaN(places = Math.abs(places)) ? places : 2;
symbol = symbol !== undefined ? symbol : "$";
thousand = thousand || ",";
decimal = decimal || ".";
var negative = number < 0 ? "-" : "",
i = parseInt(number = Math.abs(+number || 0).toFixed(places), 10) + "",
j = (j = i.length) > 3 ? j % 3 : 0;
return symbol + negative + (j ? i.substr(0, j) + thousand : "") + i.substr(j).replace(/(\d{3})(?=\d)/g, "$1" + thousand) + (places ? decimal + Math.abs(number - i).toFixed(places).slice(2) : "");
},

调用 formatMoney(jjye,4,"￥")

另一种：
formatNum(num) {
return (num + ‘‘).replace(/(\d{1,3})(?=(\d{3})+(?:$|.))/g, ‘$1,‘);
},

js中货币格式化两种方法

原文：https://www.cnblogs.com/linhan8888/p/15241331.html