angular同一個頁面多個controller值傳遞

<div ng-controller="ParentCtrl">                  //父級  
    <div ng-controller="SelfCtrl">                //自己  
        <a ng-click="click()">click me</a>  
        <div ng-controller="ChildCtrl"></div>     //子級  
    </div>  
    <div ng-controller="BroCtrl"></div>           //平級  
</div> 

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);         //父級能得到值  
    });  
    $scope.$on('to-child', function(d,data) {  
        console.log(data);         //子級得不到值  
    });  
});  
  
phonecatControllers.controller('ChildCtrl', function($scope){  
    $scope.$on('to-child', function(d,data) {  
        console.log(data);         //子級能得到值  
    });  
    $scope.$on('to-parent', function(d,data) {  
        console.log(data);         //父級得不到值  
    });  
});  
  
phonecatControllers.controller('BroCtrl', function($scope){  
    $scope.$on('to-parent', function(d,data) {  
        console.log(data);        //平級得不到值  
    });  
    $scope.$on('to-child', function(d,data) {  
        console.log(data);        //平級得不到值  
    });  
}); 

用$broadcast賦的值，只能子級能得到值，父級得不到，用$emit賦的值，只能父級得到值，子級得不到。平級都得不到值