js利用indexof方法实现数组去重

                        var arr = [1, 2, 1, 4, 3, 4, 2, 6, 8];
			var newArr=[];
			for(var i = 0; i < arr.length; i++) {
				if(newArr.indexOf(arr[i]) < 0) {
				     newArr.push(arr[i])
				}
			}
			console.log(newArr);