Angular Controller

controller 适合用来做什么

• Set up the initial state of the $scope object.
  
• Add behavior to the $scope object.
  

controller 的定义方法

推荐的方式

var myApp = angular.module('myApp',[]);
 
myApp.controller('GreetingController', ['$scope', function($scope) {
  $scope.greeting = 'Hola!';
}]);

不推荐的方式

function GreetingController($scope) {
  $scope.greeting = 'Hola!';
}

不推荐的理由：

• 全局 controller, 未指定 module.
  
• 未指定 dependency injection
  

controller 不适合做什么

• Manipulate DOM — Controllers should contain only business logic. Putting any
  presentation logic into Controllers significantly affects its testability.
  Angular has databinding for most cases and directives to encapsulate manual
  DOM manipulation.
  
• Format input — Use angular form controls instead.
  
• Filter output — Use angular filters instead.
  
• Share code or state across controllers — Use angular services instead.
  
• Manage the life-cycle of other components (for example, to create service instances).
  

参考

• http://docs.angularjs.org/guide/controller
  

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