javascript - JS deletes elements based on key and returns the length. The difference with splice is that it deletes based on position and the length is not updated.

Question

Like the title, is there such a method?

Answer 1

The element is deleted, but the original address is still retained, so the subsequent elements must be moved forward. This will reduce the number of elements and update the length

Answer 2

Will be updated

var tt = [1, 2, 3];
tt.length    // 3
tt.splice(0, 1);    // [1]
tt.length    //2

For your needs, you can write a method yourself and encapsulate splice:

function my_splice(arr, start, length) {
    arr.splice(start, length);
    return arr.length;
}