Javascript中的splice()的正确使用

<script>

      arr1=[9,2,6,4,5];

      res1=arr1.splice(2);

      console.log(res1);//[6, 4, 5]被删除的元素

      console.log(arr1);//[9,2]剩余元素

      arr2=[9,2,6,4,5];

      res2=arr2.splice(2,2);

      console.log(res2);//[6, 4]被删除的元素

      console.log(arr2);//[9,2,5]剩余元素

</script>

<script>

      arr3=[9,2,6,4,5];

      console.log(arr3);

      result=arr3.splice(1,0,99,10);

    //   console.log(result);空数组

      console.log(arr3);

      result=arr3.splice(2,0,...[111]);

      console.log(arr3);

</script>

<script>

      arr4=[1,2,3,4,5];

      res=arr4.splice(1,3,...[88,99,44]);

      console.log(arr4);

</script>