var ary=[1,2,3,3,2,3,4,5];
for(var i=0;i<ary.length;i++){
  for(var j=i+1;j<ary.length;j++){
    if(ary[i]===ary[j]){
      ary.splice(i,1);
      i--;
    }
  }
}
alert(ary);

var ary=[1,2,3,3,2,3,4,5];
var ary1=[];
for(var i=0;i<ary.length;i++){
 if(ary1.indexOf(ary[i])==-1){
 ary1.push(ary[i]);
 }
}
alert(ary1);

var ary=[1,2,3,3,2,3,4,5];
 var obj={};
 for(var i=0;i<ary.length;i++){
  var cur=ary[i];
  if(obj[cur]){
  obj[cur]++;
  }else{
  obj[cur]=1;
  }
 }
 var ary=[];
 for(var attr in obj){
  ary.push(attr);
 }
 alert(ary);

var ary=[1,2,3,3,2,3,4,5];
 ary.sort(function(a,b){return a-b;});
 for(var i=0;i<ary.length;i++){
  if(ary[i]===ary[i+1]){
  ary.splice(i,1);
  i--;
  }
 }
 alert(ary);