javascript - Binding a change event to the input file will be effective in the first execution, but will have no effect in subsequent executions.

Question

Bind the change event to the input file. It will be effective in the first execution, but will have no effect in subsequent executions

Answer 1

Has the selected file changed since then? If it is still the original file, the change event will not be triggered.

Answer 2

When the value of an element changes, the change event is triggered.
When used for select elements, the change event will occur when an option is selected;
When used for text fields, the change event will occur when the element is out of focus