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

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

迷茫 · Answer

之后选择的文件变化了吗？如果还是原来的文件，那就不会触发change事件。

巴扎黑 · Answer

当元素的值发生改变时，会触发change事件。
当用于select元素时，change事件会在选择某个选项时发生；
当用于文本域时，change事件会在元素失焦的时候发生

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