检验TextBox的输入框是否为整数（javascript）

 1         function checkTextBox(obj,type,precision,lenth)
 2         {
 3             var    re = /,/g            
 4             var s =obj.value.replace(re,"");  //将 ","千分符 替换成""空
 5  
 6             if(s!="")
 7             {
 8                 if(type == "positive number") //正数
 9                  {
10                     //if(/^[0-9]*$/.test(s))//正数
11                     if(!isNaN(s)&&s>0)//正数
12                     {
13                         var m=Math.pow(10,precision);  //10的N次幂
14                         var a=(Math.round(s*m))/m;//Math.round 函数则用于将数字转化为最接近的整数    
15                         
16                         var b= Math.floor(a);   // 向下取整  Math.floor(4.7)＝4  
17                         if(String (b).length>lenth)
18                         {
19                             alert("Enter the number of integer digits can not exceed "+lenth);
20                             
21                             //obj.value="";
22                             document.getElementById(obj.name).value="";
23                         }    
24                         else
25                         {    
26                             var  re=/(-?\d+)(\d{3})/  ;
27                             a=String (a);                 
28                             while(re.test(a))
29                             {  
30                                 a=a.replace(re,"$1,$2") ;
31                             }                  
32                             document.getElementById(obj.name).value=a;    
33                             if(obj.name=="txtCycle")
34                             {
35                                 var cycle= (28*22*3600)/s;                    
36                                 
37                                 cycle=Math.round(cycle);
38                                 
39                                 cycle=String (cycle);    
40                                              
41                             while(re.test(cycle))
42                             {  
43                                 cycle=cycle.replace(re,"$1,$2") ;
44                             }                  
45                             document.getElementById('txtMaxProduction').value=cycle;    
46                                 
47                             }
48                             
49                         }
50                     }
51                     else
52                     {
53                         alert("Please input a positive number!");    
54                         document.getElementById(obj.name).value="";        
55                     }
56                 }
57             }