js数组中是否有重复

<script>    var ary = new Array("111","22","33","111");            var s = ary.join(",")+",";             for(var i=0;i<ary.length;i++) {             if(s.replace(ary[i]+",","").indexOf(ary[i]+",")>-1) {              alert("数组中有重复元素：" + ary[i]);              break;             }            }      function isRepeat(arr){                 var hash = {};                 for(var i in arr) {                     if(hash[arr[i]])                          return true;                     hash[arr[i]] = true;                 }                 return false;            }  </script>