> For the complete documentation index, see [llms.txt](https://xiaoxiami.gitbook.io/angularjs/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://xiaoxiami.gitbook.io/angularjs/zhi_ling/angular_zi_ding_yi_zhi_ling/controller_and-and_controllasshu_xing.md).
# controller && controllAs属性
* controller 他会暴露一个API，利⽤用这个API可以在多个指令之间通过依赖注入进行通信
* controller($scope,$element,$attrs,$transclude)
* controllerAs 是给controller起个别名，方便使用
* require 可以将其他指令传递给自己
| 选项 | 用法 |
| -------------- | ------------------------------------- |
| directiveName | 通过驼峰法的命名指定了控制器应该带有哪一条指令,默认会从同一个元素上的指令 |
| ^directiveName | 在父级查找指令 |
| ?directiveName | 表示指令是可选的，如果找不到，不需要抛出异常 |
**例子：**
index.html
```markup
```
app/index.js
```javascript
angular.module('myApp', [])
.directive('bookList', function () {
return {
restrict: 'ECAM',
controller: function ($scope) {
$scope.books = [
{
name: 'php'
},
{
name: 'javascript'
},
{
name: 'java'
}
];
$scope.addBook = function(){
}
this.addBook = function(){
// ...
}
},
controllerAs:'bookListController',
template: '',
replace:true,
link:function(scope,iEelement,iAttrs,bookListController){
iEelement.on('click',bookListController.addBook)
}
}
})
.controller('firstController', ['$scope', function ($scope) {
// console.log($scope);
}]);
```