JS 将数字转化成为货币格式

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) : "");
}

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