Array de-weight method

Method One:
function Cleararrequal (arr) {
   var arr=[];
   var stopfor;
   for (var i in arr) {
       Stopfor=true;
for (Var a=0;a<arr.length;a++) {
          if (Arr[i]===arr[a]) {//Here the comparison, divided into two, one is not very strict contrast, the other is very strict comparison, please refer to the "= =" and "= = =" The difference

        Stopfor=false;
Break
   }  
  }
if (stopfor) {
      Arr.push (Arr[i]);
}
}
}

var arr1=[12, ' Yingfu ', ' ABCDEFG ', ' n ', 588, ' abcdefg ', ' Yingfu ', ' 12 ', 588];

Console.log (ARR1);

Console.log (Cleararrequal (ARR1));

Method Two: (This method has a bug, the array of values and the string value of equality will be considered the same, for example, 1, "1")

function Cleararreq (arr) {

    var hash=[];
    for (Var i=0;i<arr.length;i++) {
        if (hash[arr[i]]==undefined) {
            Hash[arr[i]]=1;
        }else{
            hash[arr[i]]++;
        }
    }
    Console.log (hash);
    Arr2=[];
    For (var k in hash) {
        Arr2.push (k)
    }
    Console.log (ARR2);

    }

}

var arr1=[12, ' Yingfu ', ' ABCDEFG ', ' n ', 588, ' abcdefg ', ' Yingfu ', ' 12 ', 588];
Cleararreq (ARR1);  ["588", "Yingfu", "ABCDEFG"]  

Array de-weight method