javascript - How to remove several values ​​​​in an array and only provide the subscript of the array

Question

Splice removal will always replace the array and subscript, so the subscript I remembered before is useless.

Answer 1

Delete the ones with big subscripts first and then delete the ones with small subscripts

Answer 2

Replace the array with an object, use the delete method to delete, and the subscript will not change

Answer 3

The map method of the array removes the elements at the specified index position and generates a new array

Or direct filter method

Answer 4

You can try it, create a new array, and then loop through the array you want to modify. If the subscript is not the number you want to delete, then push the element at this position into your new array. If The subscript is the number you want to delete, just continue to jump out of the loop
In this way, after the loop ends, the new array is the array you need, and then assign it to the old array

Answer 5

To generate a new array:

arr = [1,2,3,4,5,6,7]
removes = [1,3,5]
arr = arr.filter(function(value, index) { 
    return removes.indexOf(index) < 0
});

Do not generate new array:

arr = [1,2,3,4,5,6,7]
removes = [1,3,5]
Array.prototype.remove = function(removes){
    removes.sort(function(a, b) {
        return a - b;
    }).reverse().forEach(function(value){this.splice(value, 1)
   }.bind(this)
)};
arr.remove(removes)