var arr = [1, 1, 1, 2, 2, 3, 4, 5, 6, 3, 4, 2, 4, 1, ];
var newArr = []
for (var i = 0; i < arr.length; i++) {
if (newArr.indexOf(arr[i]) === -1) {
newArr.push(arr[i])
}
}
console.log(newArr);