js乘法计算精度

 1 function accMul(arg1, arg2) {  
 2     var m = 0,
 3         s1 = arg1.toString(),
 4         s2 = arg2.toString();  
 5     try {
 6         m += s1.split(".")[1].length
 7     } catch (e) {}  
 8     try {
 9         m += s2.split(".")[1].length
10     } catch (e) {}  
11     return Number(s1.replace(".", "")) * Number(s2.replace(".", "")) / Math.pow(10, m)
12 }