Angularjs为在scope中为我们提供了冒泡和隧道机制，$broadcast会把事件广播给所有子controller，而$emit则会将事件冒泡传递给父controller，$on则是angularjs的事件注册函数，有了这一些我们就能很快的以angularjs的方式去解决angularjs controller之间的通信

实例

html code

<div ng-controller="ParentCtrl">                  //父级  
    <div ng-controller="SelfCtrl">                //自己  
        <a ng-click="click()">click me</a>  
        <div ng-controller="ChildCtrl"></div>     //子级  
    </div>  
    <div ng-controller="BroCtrl"></div>           //平级  
</div>

JavaScript code

phonecatControllers.controller('SelfCtrl',function($scope) {  
    $scope.click = function () {  
        $scope.$broadcast('to-child','child');  
        $scope.$emit('to-parent','parent');  
    }  
});  

phonecatControllers.controller('ParentCtrl',function($scope) {  
    $scope.$on('to-parent',function(d,data) {  
        console.log(data);         //父级能得到值  
    });  
    $scope.$on('to-child',data) {  
        console.log(data);         //子级得不到值  
    });  
});  

phonecatControllers.controller('ChildCtrl',function($scope){  
    $scope.$on('to-child',data) {  
        console.log(data);         //子级能得到值  
    });  
    $scope.$on('to-parent',data) {  
        console.log(data);         //父级得不到值  
    });  
});  

phonecatControllers.controller('BroCtrl',function($scope){  
    $scope.$on('to-parent',data) {  
        console.log(data);        //平级得不到值  
    });  
    $scope.$on('to-child',data) {  
        console.log(data);        //平级得不到值  
    });  
});