app.js->index.js->index.jade
view is jada file
data come from api
controller is js?
app.js set route for inner api to inner .js file to implement mid function
angular is triggered by using html tag ng-app in jade file
angular js file also set URI and action:like $routeProvider.when('/add-video', {...})
↑ $routeProvider is in dependency ngRoute
How it work when get into home page:
app set the index.jade as home page, in index.jade there is a angular tag for angular to render. According to different URI, angular will render its part by setting route. So all the part in index remain the same except angular paty(change according to URI)