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並前往https://books.google.com.tw/books?id=PZhIDwAAQBAJ&pg=PA408&lpg=PA408&dq=checkvalidity&source=bl&ots=FDIskGDTNB&sig=ACfU3U1TDpwsWwNqCwjQWhv7OdJghYw5jg&hl=zh-TW&sa=X&ved=2ahUKEwjlnorc-ODzAhUTuosKHfa3AKoQ6AF6BQimAhAD

Web Programming with HTML5, CSS, and JavaScript

checkValidity () && diameterBox.checkValidity()) { alert("Invalid quantity value. Please reenter."); } Note the ! operator at the left of qtyBox.

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