JAvascript浮動小数点数演算精度問題

jacascriptで2つの浮動小数点数を直接加算した結果は正確ではない.以下の方法で解決できる.

function accAdd(arg1, arg2) {
		var r1, r2, m, c;
		try { r1 = arg1.toString().split(".")[1].length } catch (e) { r1 = 0  }
		try { r2 = arg2.toString().split(".")[1].length } catch (e) { r2 = 0  }
		c = Math.abs(r1 - r2);
		m = Math.pow(10, Math.max(r1,  r2))
		if (c > 0) {
			var cm = Math.pow(10,  c);
			if (r1 > r2) {
				arg1 =  Number(arg1.toString().replace(".", ""));
				arg2 =  Number(arg2.toString().replace(".", "")) * cm;
			}else {
				arg1 = Number(arg1.toString().replace(".", "")) *  cm;
				arg2 = Number(arg2.toString().replace(".",  ""));
			}
		}else {
			arg1 =  Number(arg1.toString().replace(".", ""));
			arg2 =  Number(arg2.toString().replace(".", ""));
		}
		return (arg1 +  arg2) / m
	}