JS 将数字转化成为货币格式

最近由于项目的需要需要将数字format成货币格式，自己搞了半天效果不是很好，博客园有篇问题很好，再次转载记录一下

http://www.cnblogs.com/mingmingruyuedlut/archive/2013/05/19/3082177.html

JavaScript Money Format（用prototype对Number进行扩展）

 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) : "");
    };

示例代码

var revenue = 12345678;
revenue.formatMoney(); // $12,345,678.00 
revenue.formatMoney(0, "HK$ ");

// HK$ 12,345,678 
// European formatting: 
var price = 4999.99; 
price.formatMoney(2, "€", ".", ",");

// €4.999,99 
// It works for negative values, too: 
(-500000).formatMoney(0, "£ ");// £ -500,000

JavaScript function

function 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) : "");
    }

示例代码

　　formatMoney(54321); // $54,321
　　formatMoney(12345, 0, "£ "); // £ 12,345
　　formatMoney(12345, 2, "£ "); // £ 12,345.00
　　formatMoney(12345.232, 2, "£ "); // £ 12,345.23