$格式化 revenue

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) : "");

};