数组去重3

var arr = [1, 5, 6, 3, 8, 9, 2, 3, 1, 4, 5, , 8, 9, 5, 6, 4, 8, 9, 1, 2, 3, 4, 5, 8]；

var obj = {};

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

    if(obj.hasOwnProperty(arr[i])){

      arr.splice(i,1);

}

}