js对数组去重复值

 

<script type="text/javascript"> 
Array.prototype.distinct = function(){ 
 var $ = this; 
 var o1 = {}; //存放去重复值 
 var o2 = {}; //存放重复值 
 var o3 = []; //存放重复值 

 var o; //数组单个变量
 for(var i=0;o = $[i];i++){ 
  if(o in o1){ 
   if(!(o in o2)) o2[o] = o; 
   delete $[i]; 
  }else{ 
   o1[o] = o; 
  } 
 } 
  
 $.length = 0; //清空原数组 

 for(o in o1){ 
  $.push(o); 
 } 

  
 for(o in o2){ 
  o3.push(o); 
 } 
   
 return o3; 
} 
var a = [2,2,2,3,3,3,4,4,5,6,7,7]; 
alert("原数组：" + a); 
alert("有重复的元素是：" + a.distinct()); //2,3,4,7
alert("整理后的数组是：" + a);            //2,3,4,5.6,6
alert("整理后的长度是:" + a.length)       //6
</script> 

 

 

 

 

 

 

转自：http://www.cnblogs.com/qiantuwuliang/archive/2010/03/22/1691702.html