1. [错误处理](%E9%94%99%E8%AF%AF%E5%A4%84%E7%90%8611.md) 2. [宕机](%E5%AE%95%E6%9C%BA.md) 3. [错误应用](%E9%94%99%E8%AF%AF%E5%BA%94%E7%94%A8.md) 4. [小节](%E5%B0%8F%E8%8A%828.md)