html```
<div ng-controller="EventController">
Root scope    
<tt>MyEvent</tt>count:{{count}}
<ul>
<li ng-repeat = "i in [2,1]" ng-controller = "EventController">
<button ng-click="$emit('MyEvent')">
$emit('MyEvent')
</button>
<button ng-click="$broadcast('MyEvent')">
$broadcast('MyEvent')
</button>
<br>
Middle scope   
<tt>MyEvent</tt>count:{{count}}
<ul>
<li ng-repeat="item in [1,3]" ng-controller="EventController">
Leaf scope   
<tt>MyEvent</tt>count:{{count}}
</li>
</ul>
</li>
</ul>
</div>

js:
function EventController($scope) {
    $scope.count = 0;
    $scope.$on("MyEvent",function(){
        $scope.count++;
    })
}

输入代码