selector提示红色，意思是应该有前缀app.修改为app-login-page即可
The selector should be prefixed by "app" (https://angular.io/guide/styleguide#style-02-07)
selector提示红色，意思是应该有前缀app.修改为app-login-page即可
The selector should be prefixed by "app" (https://angular.io/guide/styleguide#style-02-07)