]<script>
Array.prototype.distinct = function(){
var $ = this;
var o1 = {};
var o2 = {};
var o3 = [];
var o;
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;
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());
alert("整理后的数组是：" + a);
alert("整理后的长度是:" + a.length)
</script>
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