js 实现序列号效果实现

 1 <form name="" action="" method="post">
 2 <p>
 3 <label>请输入激活码：</label>
 4 <span class="act-code-group">
 5     <input id="act-code-item-1" name="act-code-item-1" class="act-code-item" type="text" /> - 
 6     <input name="act-code-item-2" class="act-code-item" type="text" /> - 
 7     <input name="act-code-item-3" class="act-code-item" type="text" /> - 
 8     <input name="act-code-item-4" class="act-code-item" type="text" />
 9 </span>
10     <input class="act-code-hidden" type="hidden" value="" />
11 </p>

 1 function initActCodeGroup(dom){
 2     var actCodeGroup = dom,
 3         actCodeItem = actCodeGroup.find(‘.act-code-item‘);
 4     var ctrlPress = false;
 5     //actCodeItem.attr(‘maxlength‘, ‘5‘);
 6     actCodeItem.keyup(function(e){
 7         var oldVal = $(this).val();
 8         if(e.keyCode === 8){
 9             // backspace
10             if(oldVal.length <= 0){
11                 $(this).prev().focus();
12             }
13         }else if(e.keyCode === 86 && ctrlPress){
14             //ctrl + v
15             var parseTxt = $(this).val(),
16                 parseTxtLen = parseTxt.length;
17 
18             ctrlPress = false;
19 
20             var actCodes = [];
21             if(parseTxt.indexOf(‘-‘) >= 0){
22                 actCodes = parseTxt.split(‘-‘);
23             }else{
24                 if(parseTxtLen >= 4){actCodes.push(parseTxt.substr(0, 4));}
25                 if(parseTxtLen >= 8){actCodes.push(parseTxt.substr(4, 4));}
26                 if(parseTxtLen >= 12){actCodes.push(parseTxt.substr(8, 4));}
27                 if(parseTxtLen >= 16){actCodes.push(parseTxt.substr(12, 4));}
28             }
29 
30             if(actCodes.length > 1){
31                 var curInput = $(this);
32                 $.each(actCodes, function(i, v){
33                     if(curInput && v.length <= 4){
34                         curInput.val(v);
35                         curInput = curInput.next();
36                     }else{
37                         return false;
38                     }
39                 });
40             }
41 
42         }else if(e.keyCode === 17){
43             setTimeout(function(){
44                 ctrlPress = false;
45             }, 1000);
46         }else{
47             if(oldVal.length >= 4){
48                 $(this).val(oldVal.substr(0,4));
49                 if($(this).next().length > 0){
50                     $(this).next().focus();
51                 }
52             }
53         }
54     }).keydown(function(e){
55         if(e.keyCode === 17){
56             ctrlPress = true;
57         }
58     });
59 }

$(document).ready(function(){
        initActCodeGroup($(‘.act-code-group‘)); 
});