1. 属性
  2. hashCode
  3. length
  4. runtimeType
  5. scrollRestoration
  6. state
  7. 方法
  8. back
  9. forward
  10. go
  11. noSuchMethod
  12. pushState
  13. replaceState
  14. toString
  15. 运算符
  16. operator ==
  17. 静态属性
  18. supportsState