//加 const b2add = function(arg1, arg2) { arg1 = arg1.toStrin…

//加
const b2add = function(arg1, arg2) {
	arg1 = arg1.toString(), arg2 = arg2.toString();
	var arg1Arr = arg1.split("."), arg2Arr = arg2.split("."), d1 = arg1Arr.length == 2 ? arg1Arr[1] : "", d2 = arg2Arr.length == 2 ? arg2Arr[1] : "";
	var maxLen = Math.max(d1.length, d2.length);
	var m = Math.pow(10, maxLen);
	var result = Number(((arg1 * m + arg2 * m) / m).toFixed(maxLen));
	var d = arguments[2];
	return typeof d === "number" ? Number((result).toFixed(d)) : result;
}