.splice（）方法在Javascript中不起作用？

Question

Whenever I use the splice method in Javascript like so:

Array.prototype.mymethod = function() {
  return this[num].splice();
}

It returns an error in my tests saying that splice() is not a method in Javascript. The test only contains an array consisting of ['a', 'b', 'c'] , however it's not working when the prototype I'm using tries to splice() the array. Can't seem to figure out what's going on. Thanks.

Answer 1

this.splice() splices the array

this[num].splice() tries to splice the element at index num which is a string and doesnt have a splice method

Answer 2

你在数组的元素上调用splice，而不是在数组本身上调用。