js中for循环的问题

    今天过来加班，运行了一下以前写的代码，竟然有问题，出错的地方是由于一段js代码引起的：
    

 1 string  scriptA  =   @"
 2                     <script>
 3                     var s ;
 4                     var sNun ;
 5                     var controlNum ;
 6                     var chkother= document.getElementsByTagName('input');
 7                     for (var i=0;i<chkother.length;i++)
 8                     {
 9                         if( chkother[i].type=='submit')
10                         {
11                             if(chkother[i].id.indexOf('btnSubmit')>-1)
12                             {
13                               
14                                   s = chkother[i].id.split('_'); 
15                                   controlNum = s[s.length-1] ;
16                                   break ;
17                             }
18                         }
19                     }  " ;
20              if ( ViewState[ " PersonType " ].ToString()  !=   ""  )
21              {
22                scriptA += @" var controlUserId = 'userName_'+s[s.length-1]+'_Value1' ;
23                   var userIdValue =  document.all['AppOpinion_list1_'+controlUserId].value ;
24                   document.all.AppOpinion_list1_hiddMan.value = userIdValue;  ";
25            }
26                    
27             scriptA  +=   @"   var controlRaesonId = 'txtOPinion_'+s[s.length-1]; 
28             var reasonValue =  document.all['AppOpinion_list1_'+controlRaesonId].value ;
29             document.all.AppOpinion_list1_hiddoValue.value = reasonValue;
30                 
31             var j =0;
32             for (var i=0;i<chkother.length;i++)
33             {
34                     if(chkother[i].id.indexOf('AppOpinion_list1_radiobtnResule_'+s[s.length-1])>-1)
35                     {
36                         j++;
37                         if( chkother[i].checked )
38                         {
39                                     sNun = j ;
40                             }
41                     }
42             }
43             document.all.AppOpinion_list1_hiddResult.value = sNun;
44             document.all.AppOpinion_list1_btnInsertFlow.click();
45             </script> " ;
46         Page.RegisterStartupScript( " EA " ,scriptA);

    在for循环中没有增加break的时候，s[s.length-1]的值在先后的调用中会不同，这点就比较郁闷 ，增加break语句跳出循环，就不会存在该问题，值的改变也只是在if语句中，而且确认一个数据符合if语句，虽然问题解决了，但是还不知道原因，以后在找找原因了，mark。。。