12.利用函数反转数组

 

 

 

<script>
    //利用函数翻转任意数组 reverse 翻转
    function reverse(arr) {
      let newArr = [];
      for (let i = arr.length - 1; i >= 0; i--) {
        newArr[newArr.length] = arr[i];
      }
      return newArr;
    }
    var arr1 = reverse([1, 3, 5, 6, 9]);
    console.log(arr1);
    var arr2 = reverse(["pink", "blue", "red"]);
    console.log(arr2);
  </script>