ตอบโต้บเงื่อนไขเซลส่วนประกอบปุ่มพิมพ์ลัด

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ตอบโต้บเงื่อนไขเซลส่วนประกอบปุ่มพิมพ์ลัด

function Mailbox(props) {
  const unreadMessages = props.unreadMessages;
  return (
    <div>
      <h1>Hello!</h1>
      {unreadMessages.length > 0 &&
        <h2>
          You have {unreadMessages.length} unread messages.
        </h2>
      }
    </div>
  );
}

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