这里的关键是倒数第二行：set - property标记。
The key here is the next-to-last line: the set-property tag.
简单的倒数计时器。开始返回、取消转义、暂停和恢复与空间的关键。
Simple countdown timer. Start with Return, cancel with Escape, pause and resume with Space key.
简单的倒数计时器。开始返回、取消转义、暂停和恢复与空间的关键。
Simple countdown timer. Start with Return, cancel with Escape, pause and resume with Space key.
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