text: 
  
  from django.core.files.storage import Storage
  from django.conf import settings
  
  
  class FastDFSStorage(Storage):
  
      def open(self, name, mode='rb'):
          return None
  
      def save(self, name, content, max_length=None):
          pass
  
      def url(self, name):
          # 该函数返回到结果就是， ImageField.url属性的出的结果
  
          return settings.FDFS_URL + name
  