js运算BUG

 1     /*JS浮点计算BUG屏蔽终极解决办法*/  
 2       
 3         function accDiv(arg1, arg2) {  
 4       
 5             var t1 = 0, t2 = 0, r1, r2;  
 6       
 7             try { t1 = arg1.toString().split(".")[1].length } catch (e) { }  
 8       
 9             try { t2 = arg2.toString().split(".")[1].length } catch (e) { }  
10       
11             with (Math) {  
12       
13                 r1 = Number(arg1.toString().replace(".", ""))  
14       
15                 r2 = Number(arg2.toString().replace(".", ""))  
16       
17                 return (r1 / r2) * pow(10, t2 - t1);  
18       
19             }  
20       
21         }  
22       
23       
24       
25         //给Number类型增加一个div方法，调用起来更加方便。  
26       
27         Number.prototype.div = function(arg) {  
28       
29             return accDiv(this, arg);  
30       
31         }  
32       
33       
34       
35       
36         function accMul(arg1, arg2) {  
37       
38             var m = 0, s1 = arg1.toString(), s2 = arg2.toString();  
39       
40             try { m += s1.split(".")[1].length } catch (e) { }  
41       
42             try { m += s2.split(".")[1].length } catch (e) { }  
43       
44             return Number(s1.replace(".", "")) * Number(s2.replace(".", "")) / Math.pow(10, m)  
45       
46         }  
47       
48         Number.prototype.mul = function(arg) {  
49       
50             return accMul(arg, this);  
51       
52         }  
53       
54         function accAdd(arg1, arg2) {  
55       
56             var r1, r2, m, c;  
57       
58             try { r1 = arg1.toString().split(".")[1].length } catch (e) { r1 = 0 }  
59       
60             try { r2 = arg2.toString().split(".")[1].length } catch (e) { r2 = 0 }  
61       
62             c = Math.abs(r1 - r2);  
63             m = Math.pow(10, Math.max(r1, r2))  
64             if (c > 0) {  
65                 var cm = Math.pow(10, c);  
66                 if (r1 > r2) {  
67                     arg1 = Number(arg1.toString().replace(".", ""));  
68                     arg2 = Number(arg2.toString().replace(".", "")) * cm;  
69                 }  
70                 else {  
71                     arg1 = Number(arg1.toString().replace(".", "")) * cm;  
72                     arg2 = Number(arg2.toString().replace(".", ""));  
73                 }  
74             }  
75             else {  
76                 arg1 = Number(arg1.toString().replace(".", ""));  
77                 arg2 = Number(arg2.toString().replace(".", ""));  
78             }  
79             return (arg1 + arg2) / m  
80       
81         }  
82       
83         Number.prototype.add = function(arg) {  
84       
85             return accAdd(arg, this);  
86       
87         }  

From：http://blog.csdn.net/l3917055/archive/2010/09/04/5863215.aspx