Javascript converts numbers into currency format strings

The first method here is to use JavaScript to convert the number number into a currency string format (parameters: preserve the decimal places, currency symbols, integer part thousands separators, decimal separators)

The second method here is to convert currency characters into pure numeric strings with a simple regular expression, and then you can convert the string into a numeric number.

JavaScript Money Format (Extend Number with prototype)

 // Extend the default Number object with a formatMoney() method:// usage: someVar.formatMoney(decimalPlaces, symbol, thousandsSeparator, decimalSeparator)// defaults: (2, "$", ",", ".")Number.prototype.formatMoney = function (places, symbol, thousands, decimal) { places = !isNaN(places = Math.abs(places)) ? places : 2; symbol = symbol !== undefined ? symbol : "$"; thousands = thousands || ","; 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) + thousands : "") + i.substr(j).replace(/(/d{3})(?=/d)/g, "$1" + thousands) + (places ? decimal + Math.abs(number - i).toFixed(places).slice(2) : "");};

Here are some conversion examples:

 // 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, ", ".", ",")); // .999,99// It works for negative values, too:alert((-5000000).formatMoney(0, "£ ")); // £ -500,000

Currency to number removing money formatting (filter with regular expressions)

 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

This method is only used in the pattern where the decimal separator is "." If the decimal separator is "," then the regular expression is /[^0-9-,]/g

Versions that do not use prototype to expand Number:

 // To set it up as a global function:function formatMoney(number, places, symbol, thousands, decimal) { number = number || 0; places = !isNaN(places = Math.abs(places)) ? places : 2; symbol = symbol !== undefined ? symbol : "$"; thousands = thousands || ","; 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) + thousands : "") + i.substr(j).replace(/(/d{3})(?=/d)/g, "$1" + thousands) + (places ? decimal + Math.abs(number - i).toFixed(places).slice(2) : "");}// To create it as a library method:myLibrary.formatMoney = function (number, places, symbol, thousands, decimal) { /* as above */}// Example usage:formatMoney(54321); // $54,321myLibrary.formatMoney(12345, 0, "£ "); // £ 12,345

The above is the entire content of this article. For more information about JavaScript, you can check out: "JavaScript Reference Tutorial" and "JavaScript Code Style Guide". I also hope that everyone will support Wulin.com more.