javascript计算浮点数精确计算

javascript计算浮点数精确计算，代码如下：

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;

}