好。我同学有回答，不过我认为他的回答没有解决问题

下面是链接：

https://chanworld.org/community/development/%e4%bd%9b%e6%95%99%e4%bf%ae%e8%a1%8c%e4%ba%bab%e4%b8%8e%e5%9f%ba%e7%9d%a3%e6%95%99%e6%9c%8b%e5%8f%8by%e7%9a%84%e5%af%b9%e8%b0%88-1-2020-3-5/#post-5181