js 将数字格式化成货币（钱）格式

// 价格，小数点后几位，替换$，千分位显示什么符号默认'，'  ，  小数点'.'
function formatMoney(number, places, symbol, thousand, decimal) {
number = number || 0;
places = !isNaN(places = Math.abs(places)) ? places : 2;
symbol = symbol !== undefined ? symbol : "$";
thousand = thousand || ",";
decimal = decimal || ".";
var negative = number < 0 ? "-" : "",
i = parseInt(number = Math.abs(+number || 0).toFixed(places), 10) + "",
j = (a = i.length) > 3 ? a % 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(12345.67) // $12,345.67
formatMoney(12345.67 , 3 , "￥") // ￥12,345.670
//再把'$12,345.67' 变成纯数字 12345.67
parseFloat('$12,345.67'.replace(/[^0-9-.]/g, ''))