在1..n范围内找到具有均匀概率的k个非连续随机数(Finding k non contiguous random numbers with uniform probability in the range 1..n)

 所以你可能不得不创建一个控制器，理想情况下是一个服务。 
 
 如果你不知道那些是什么，请查看这篇文章 -应该给你一个很好的介绍AngularJS。 
 
 好的，现在你想要实际创建一个新的控制器并将其附加到你的app模块。 您实际上可以继续并在控制器中输入pikaday函数，并通过在您的指令中在restrict下添加另一个参数将您的指令链接到控制器来调用它： 
 
   return {
       template: template,
       restrict: 'E',
       controller: 'controller',
       controllerAs: 'ctrl'
   }
 
 完成后，您可以继续将pikaday函数附加到控制器，并通过在元素中添加此标记来在指令中访问它： 
 
  "ng-click='loadPikaday()'"
 
 如果这对你来说真的让人感到困惑，我建议给我上面标记的那篇文章一个好的阅读和你应该清理的东西。 那篇文章真正概述了AngularJS应用程序的构建以及不同组件如何协同工作。 
 
 希望这有助于！ 
 
 编辑：侧面说明，操作控制器中的DOM通常是不好的做法，所以你应该将pikaday函数转换为服务，但为了快速修复，这应该可行。 

So you're probably going to have to create a controller and ideally a service.
 
If you don't know what those are, check this article out- should give you a good intro into AngularJS.
 
Ok, so now you'll want to actually create a new controller and attach it to your app module. You could actually go ahead and toss in the pikaday function in the controller, and call it by linking your directive to your controller by adding another parameter in your directive under restrict as:
 
   return {
       template: template,
       restrict: 'E',
       controller: 'controller',
       controllerAs: 'ctrl'
   }
 
Once you have that in place, you can go ahead and attach the pikaday function to your controller and access it in your directive by adding this tag in your element: 
 
  "ng-click='loadPikaday()'"
 
If this seems really confusing to you, I'd recommend giving that article I tagged above a good read and things you should clear up a little. That article really outlines the build of AngularJS apps and how the different components work together.
 
Hope this helped!
 
EDIT: On a side note, it's generally bad practice to manipulate the DOM in controllers, so you should the pikaday function into a service, but for a quick fix, this should work.