JavaScript实现简单排列组合算法

完整HTML示例

<!DOCTYPE html>
<html>
 <head>
  <title>demo</title>
  <script type="text/javascript">
   var str = [1,2,3,4,5];
   var count = 0;
   function arrange(s){
    for(var i=0,length=str.length; i<length; i++) {
     if(s.length == length - 1) {
      if(s.indexOf(str[i]) < 0) {
       count++;
       console.log("组合"+count+"="+s + str[i]);
      }
      continue;
     }
     if(s.indexOf(str[i]) < 0) {
      arrange(s+str[i]);
     }
    }
   }
   arrange("");
  </script>
 </head>
 <body>
 </body>
</html>