Angularjs 无法使用fat箭头访问作用域

我可能遗漏了一些关于范围界定的基本内容

任何人都可以解释发生了什么以及如何从

范围内的外部范围正确访问对象
ngModelController
。$watch

下面是一个例子：

myDirModule = angular.module("myDir", []) 
.directive "myDir", ($compile) -> 
restrict: "A"
require: "ngModel" 
scope:  
  myParam: "=ngModel" 
compile: (element, attrs) -> 

  // ... more code here ...

  post: (scope, element, attrs, ngModelController) -> 

    // ... more code here ...

    // ngModelController defined here :D

    scope.$watch 'myParam', (newValue, oldValue) =>
      // ngModelController NOT defined here :(

---

将postlink函数直接返回到compile函数：

myDirModule = angular.module("myDir", []) 
.directive "myDir", ($compile) -> 
restrict: "A"
require: "ngModel" 
scope:  
  myParam: "=ngModel" 
compile: (element, attrs) -> 
  # more code here
  # return postlink function directly
  (scope, element, attrs, ngModelController) ->
    console.log(ngModelContoller)

或者将pre和post函数作为散列返回

myDirModule = angular.module("myDir", []) 
.directive "myDir", ($compile) -> 
restrict: "A"
require: "ngModel" 
scope:  
  myParam: "=ngModel" 
compile: (element, attrs) -> 
  # more code goes here
  # return pre and post as a hash
  pre: (scope, element, attrs, ngModelController) ->
    console.log(ngModelController)
  post: (scope, element, attrs, ngModelController) ->
    console.log(ngModelContoller)

还要确保使用

->

，而不是

=>