数组去重

var arr = [2,8,0,"P",'H',"P","W",'E','B',8,0,"W"];
    for(var i=0;i<arr.length;i++){
        for(var j=i+1;j<arr.length;j++){
            if(arr[i]==arr[j]){
                arr.splice(j,1);
            }                    
        }
        j--;
    }
console.log(arr)