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：
    

 1string 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。。。