<test word="{{wordCtrl}}"></test>

app.controller('myController1',['$scope',function($scope){
    $scope.wordCtrl="hello";
}]);
app.directive('test',function(){
    return{
     restrict:'E',
     template:"<div>{{word}}</div>",
     link:function(scope,ele,attr){
      scope.word=attr.word;
     }
    }
});

app.directive('test',function(){
    return{
     restrict:'E',
     scope:{
      word:'@'
     },
     template:"<div>{{word}}</div>",
    }
});

<div>
   <span>ctrl:</span>
   <input ng-model="wordCtrl"/>
</div>
<test word="{{wordCtrl}}"></test>

app.directive('test',function(){
    return{
     restrict:'E',
     scope:{
      word:'@'
     },
     template:"directive:<input ng-model='word' />",
    }
});

<test greet="sayHello()"></test>

app.directive('test',function(){
    return{
     restrict:'E',
     scope:{
      greet:'&'
     },
     template:"<div ng-click='sayHello({name:'yuxiaoliang'})'>点击说HELLO</div>",
    }
});