Javascript將數字轉化成為貨幣格式字串，javascript貨幣

Javascript將數字轉化成為貨幣格式字串，javascript貨幣

這裡第一個方法是用JavaScript將數字number轉換為貨幣字串的格式(參數：保留小數位元，貨幣符號，整數部分千位分隔字元，小數分隔字元)

這裡第二個方法是用簡單的Regex將貨幣字元換轉換為純淨的數字字串，之後便可以將字串轉換為數字number
JavaScript Money Format（用prototype對Number進行擴充）

// Extend the default Number object with a formatMoney() method:// usage: someVar.formatMoney(decimalPlaces, symbol, thousandsSeparator, decimalSeparator)// defaults: (2, "$", ",", ".")Number.prototype.formatMoney = function (places, symbol, thousand, decimal) {  places = !isNaN(places = Math.abs(places)) ? places : 2;  symbol = symbol !== undefined ? symbol : "$";  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) : "");};

如下便是一些轉換執行個體：

// Default usage and custom precision/symbol :var revenue = 12345678;alert(revenue.formatMoney()); // $12,345,678.00alert(revenue.formatMoney(0, "HK$ ")); // HK$ 12,345,678// European formatting:var price = 4999.99;alert(price.formatMoney(2, "?", ".", ",")); // ?4.999,99// It works for negative values, too:alert((-500000).formatMoney(0, "£ ")); // £ -500,000

Currency to number – removing money formatting （用Regex進行過濾）

var price = (12345.99).formatMoney(); // "$12,345.99"// Remove non-numeric chars (except decimal point/minus sign):priceVal = parseFloat(price.replace(/[^0-9-.]/g, '')); // 12345.99

這個方法僅僅應用於小數分隔字元為"."的模式，如果小數分隔字元是"," 那麼Regex為/[^0-9-,]/g

 不用prototype對Number進行拓展的版本：

// To set it up as a global 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) : "");}// To create it as a library method:myLibrary.formatMoney = function (number, places, symbol, thousand, decimal) {  /* as above */}// Example usage:formatMoney(54321); // $54,321myLibrary.formatMoney(12345, 0, "£ "); // £ 12,345

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