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

 

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