JSON无法获取数据(JSON cannot get data)

 这里的解决方案是获取您需要的所有数据并创建一个类别数组，每个类别都包含自己的子类别。 并在嵌套的ng-repeats使用此对象。 
 
 请检查我的更新版本的plunker： 
 
 https://plnkr.co/edit/BaHOcI4Qa8t5CkbshyCX 
 
 如你所见，我使用： 
 
ng-repeat="category in documents.categories"
 
 在外部ng-repeat和： 
 
ng-repeat="service in category.subCategories"
 
 在内在的。 
 
 在Controller中，我按以下方式构建category.subCategories ： 
 
documentsFactory
  .getCategories() // Get categories
  .then(function(response) { // Extract them from the response
    return response.data.subCategory;
  })
  .then(getSubcategories) // For every catgory, get its own subcategory
  .then(function(categories) { // Add categories to the $scope
    self.categories = categories;
  });
 
 getSubcategories是： 
 
function getSubcategories(categories) {
  console.log(categories)
  var retrievSubcategories = categories.map(function(category) { // Create a promise to get the subcategories for every category
    return documentsFactory
      .getServicesByCategory(category.name) // Get the subcategories for the given category
      .then(function(response) {
        category.subCategories = response.data.documents; // Add subgategories to the category
        return category;
      });
  });
  return $q.all(retrievSubcategories) // Return a promise resolve only when all the subcategories for every category are retrieved
}

The solution here is to get all the data you need and create an array of categories, each one containing its own sub categories. And use this object in the nested ng-repeats.
 
Please check my updated version of your plunker:
 
https://plnkr.co/edit/BaHOcI4Qa8t5CkbshyCX
 
As you can see, I use:
 
ng-repeat="category in documents.categories"
 
In the outer ng-repeat and:
 
ng-repeat="service in category.subCategories"
 
In the inner one.
 
In the Controller I build the category.subCategories in the following way:
 
documentsFactory
  .getCategories() // Get categories
  .then(function(response) { // Extract them from the response
    return response.data.subCategory;
  })
  .then(getSubcategories) // For every catgory, get its own subcategory
  .then(function(categories) { // Add categories to the $scope
    self.categories = categories;
  });
 
Where getSubcategories is:
 
function getSubcategories(categories) {
  console.log(categories)
  var retrievSubcategories = categories.map(function(category) { // Create a promise to get the subcategories for every category
    return documentsFactory
      .getServicesByCategory(category.name) // Get the subcategories for the given category
      .then(function(response) {
        category.subCategories = response.data.documents; // Add subgategories to the category
        return category;
      });
  });
  return $q.all(retrievSubcategories) // Return a promise resolve only when all the subcategories for every category are retrieved
}