关于drupal的路由机制，不用hook_menu()

https://www.drupal.org/node/1800686

All functionality of hook_menu() is replaced by new systems for routing, menu links, local tasks, actions and contextual links

在drupal7里，路由是 用hook_menu来实现。以这些组成：  

menu links（菜单）, local tasks（TAB切换）, actions（动作） and contextual links（上下文）

但在是drupal8里，由不同的yml文件来实现。

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8.2.x core/lib/Drupal/Core/Routing/routing.api.php routing

https://api.drupal.org/api/drupal/core%21lib%21Drupal%21Core%21Routing%21routing.api.php/group/routing/8.2.x

更多 请访问 https://www.drupal.org/docs/8/api/routing-system/routing-system-overview