js 数组

转：http://superivan.iteye.com/blog/1131328
JS判断一个数组中是否有重复值的三种方法

方法一:

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;

}

}
方法二:
var ary = new Array("111","22","33","111");

var nary=ary.sort();

for(var i=0;i<ary.length;i++){

if (nary[i]==nary[i+1]){

  alert("数组重复内容："+nary[i]);

}

}
方法三:
function isRepeat(arr){

     var hash = {};

     for(var i in arr) {

         if(hash[arr[i]])

              return true;

         hash[arr[i]] = true;

     }

     return false;

}