<div ng-controller="parentCtrl">
 <span>{{number}}</span>
 <div ng-controller="childCtrl">
  <span>{{number}}</span>
  <button ng-click="number = number +1">增加</button>
 </div>
</div>

function parentCtrl($scope){
 $scope.number = 1;
}
function childCtrl($scope){ 
}

 <div ng-controller="parentCtrl">
  <span>{{number}}</span>
  <div ng-controller="childCtrl">
   <span>{{number}}</span>
   <button ng-click="$parent.number = number +1">增加</button>
  </div>
 </div>

 <div ng-controller="parentCtrl">
  <span>{{data.number}}</span>
  <div ng-controller="childCtrl">
   <span>{{data.number}}</span>
   <button ng-click="data.number = data.number +1">增加</button>
  </div>
 </div>
 
 function parentCtrl($scope){
  $scope.data.number = 123';
 }
 function childCtrl($scope){
  
 }

.directive("myDirective", function () {
return {
 restrict: "AE",
 scope: {
  name: '@myName',
  age: '=',
  changeAge: '&changeMyAge'
 },
 replace: true,
 template: "<div class='my-directive'>" +
  "我的名字是：<span ng-bind='name'></span><br/>" +
  "我的年龄是：<span ng-bind='age'></span><br/>" +
  "在这里修改名字：<input type='text' ng-model='name'><br/>" +
  "<button ng-click='changeAge()'>修改年龄</button>" +
  " </div>"
}

<div my-directive my-name="{{name}}"></div>

<div my-directive age="age"></div>

<div my-directive change-my-age="changeAge()"></div>