排列组合的递归实现

 1 <!DOCTYPE html>
 2 <html>
 3     <head>
 4         <meta charset="utf-8">
 5         <title></title>
 6     </head>
 7     <body>    
 8         <script>
 9             
10             var d =  ["a","b","c"];
11             var arr = [];
12             kk("");
13             
14             function kk(dd){
15                 if(dd.length == 4){
16                     arr.push(dd)
17                     return;
18                 }
19                 for(var l = 0;l<3;l++){
20                     kk(dd+d[l])
21                 }
22             }
23             console.log(arr)
24         </script>
25     </body>
26 </html>

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