在AngularJS中，ng-controller是最常用的directive。比如：
var app = angular.module("app",[]); app.controlle("AppCtrl", function(){ var app = this; app.people = [ {"firstName":"", "lastName":""}, ... ]; }) app.controller("FirstCtrl", function(){ var first = this; first.message = "i am the first one"; }) app.controller("SecondCtrl", function(){ var second = this; second.message = "i am the second one"; })
页面部分：
<body ng-controller="AppCtrl as app">
<div ng-controller="FirstCtrl as first">
{{first.message}}
</div>
<div ng-controller="SecondCtrl as second">
{{second.message}}
</div>
</body>
现在模拟一个ng-controller的directive
app.directive("myController", function(){
return {
scope: true,
controller: '@'
}
})
可见，my-controller和ng-controlller工作原理是一样的。
页面部分使用my-controller
<body my-controller="AppCtrl as app">
<div my-controller="FirstCtrl as first">
{{first.message}}
</div>
<div my-controller="SecondCtrl as second">
{{second.message}}
</div>
</body>
所有的页面呈现都不变。
如果我们想让自定义的my-controller替代AngularJS默认的ng-controller，可以使用priority属性：
app.directive("myController", function(){
return {
scope: true,
controller: '@',
priority: 500
}
})
默认的priority字段值是0.