tion/implement_error/">实现系统错误接口</a></li>
<li>
  <a href="/introduction/implement/">判断是否实现接口</a></li>
<li>
  <a href="/introduction/error/">错误</a></li>
<li>
  <a href="/introduction/zero_value/">零值</a></li>
<li>
  <a href="/introduction/type_comparison/">类型比较</a></li>
</ul>
</li>
</ul>
<hr>
<ul>
<li><strong>4. 协程与通道</strong>
<ul>
<li>
  <a href="/introduction/goroutine/">goroutine</a></li>
<li>
  <a href="/introduction/channel/">非缓冲通道</a></l