js格式化金额

//格式化金额，s:金额； n:保留位数formatMoney = function(s, n) {     n = n > 0 && n <= 20 ? n : 2;     s = parseFloat((s + "").replace(/[^\d\.-]/g, "")).toFixed(n) + "";     var l = s.split(".")[0].split("").reverse(), r = s.split(".")[1];     t = "";     for (i = 0; i < l.length; i++) {     t += l[i] + ((i + 1) % 3 == 0 && (i + 1) != l.length ? "," : "");     }     return t.split("").reverse().join("") + "." + r;     }