javascript - How to know the specific position in a String of a key pressed in the Keypress Event - Stack Overflow
https://stackoverflow.com/questions/55659231/how-to-know-the-specific-position-in-a-string-of-a-key-pressed-in-the-keypress-e
event.selectionStartで取れそう？
https://stackoverflow.com/questions/55659231/how-to-know-the-specific-position-in-a-string-of-a-key-pressed-in-the-keypress-e
event.selectionStartで取れそう？
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