How many ng-App attributes can be declared in in Angular JS? and under what circumstances?
据我所知,ng-app用于Angular JS应用程序的自动引导程序.
http://docs.angularjs.org/api/ng.directive:ngApp
Only one AngularJS application can be auto-bootstrapped per HTML document. The first ngApp found in the document will be used to define the root element to auto-bootstrap as an application. To run multiple applications in an HTML document you must manually bootstrap them using angular.bootstrap instead. AngularJS applications cannot be nested within each other.
TL; DR：你可以有多个,但只有第一个会被引导.
这个问题类似于：
> How to define two angular apps / modules in one page?
> Multiple ng-app directives on a page
> AngularJS Multiple ng-app within a page
