根据Angular文档,我们只能在配置块中注入Providers(而不是实例). https://docs.angularjs.org/guide/module#module-loading-dependencies
但与此相反,Angular允许您注入$provide或$inject尽管它们是单例服务实例.
$provide
$inject
https://docs.angularjs.org/api/auto/service/$provide
javascript app-config angularjs angularjs-injector
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