1. 构造函数
  2. 压缩选项
  3. 属性
  4. clientMaxWindowBits
  5. clientNoContextTakeover
  6. 启用
  7. hashCode
  8. runtimeType
  9. serverMaxWindowBits
  10. serverNoContextTakeover
  11. 方法
  12. noSuchMethod
  13. toString
  14. 运算符
  15. 运算符 ==
  16. 常量
  17. compressionDefault
  18. compressionOff