Js in the input box to block the key can only type a number of sample code
- 2020-03-30 01:14:05
Technical essentials: The onkeydown event is triggered before the onkeyup event. When the onkeydown event returns false, the onkeyup event will not be triggered, and the character that the user just pressed will not be in the input box, thus achieving the purpose of masking some characters. Understanding this event trigger mechanism should be extended in the mind (for example, several events of the mouse will be the same mechanism)...