来自angular.io:

Taken from angular.io:

Angular模块类与JavaScript模块类在三个主要方面不同:

The Angular module classes differ from JavaScript module class in three key respects:

1. Angular模块仅限制可声明的类.声明式是唯一与Angular相关的类.

1. An Angular module bounds declarable classes only. Declarables are the only classes that matter to the Angular.

我们没有在一个巨型文件中定义所有成员类(如在JavaScript模块中一样)，而是在@NgModule.declarations列表中列出了该模块的类.

Instead of defining all member classes in one giant file (as in a JavaScript module), we list the module's classes in the @NgModule.declarations list.