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並前往https://books.google.com.tw/books?id=_TgzEAAAQBAJ&pg=PT345&lpg=PT345&dq=react+setstate+timer&source=bl&ots=aE6TTsFp9V&sig=ACfU3U01kX0Jgz9ePzZ799cZAxIuJCe5ww&hl=zh-TW&sa=X&ved=2ahUKEwiD_Zb-ouL9AhV2j4kEHY_GD1MQ6AF6BAgYEAM

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

timeLeft - 1 if (timeLeft == 0) clearInterval(timer) this.setState({timeLeft: timeLeft}) }, 1000) return this.setState({timeLeft: timeLeft, timer: timer}) ...

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