Slowly but surely progressing with Angular2. And now I faced the following challenge. I want to check if the user logged in or not on every page change (in other words on load of each and every component). Of course, I can implement OnInit interface in each and every one of them, but that is code smell.Slowly but surely progressing with Angular2. An
阅读背景：
检查用户是否登录Angular 2中的任何页面更改
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