text: # 1.导包
  from django.conf import settings
  from django.core.files.storage import Storage
  
  
  # 2.继承类
  class FastDFSStorage(Storage):
      def __init__(self):
          self.base_url = settings.FDFS_BASE_URL
  
      # 3._open
      def _open(self, name, mode='rb'):
          pass
  
      # 4._save
      def _save(self, name, content, max_length=None):
          pass
  
      # 5. url
      def url(self, name):
          # http://192.168.90.172:8888/ ---我们自己添加
          # group1/M00/00/00/CtM3BVnifxeAPTodAAPWWMjR7sE487.jpg == name
          return self.base_url + name
  