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並前往https://books.google.com.tw/books?id=_TgzEAAAQBAJ&pg=PT190&lpg=PT190&dq=beforeunload&source=bl&ots=aE2QUwHn3P&sig=ACfU3U2Nlr9r2wlmmaSFV6xHAVdrAYwY0A&hl=zh-TW&sa=X&ved=2ahUKEwiNyqPA94L0AhUYp5UCHYB3CYQQ6AF6BQiqAhAD

React Quickly: Painless web apps with React, JSX, Redux, and ...

addEventListener('beforeunload',function () { let confirmationMessage = 'Do you really want to close?' e.returnValue = confirmationMessage // Gecko, Trident ...

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