1. 构造函数
2. WebSocketStatus
3. 属性
4. hashCode
5. runtimeType
6. 方法
7. noSuchMethod
8. toString
9. 运算符
10. operator ==
11. 常量
12. abnormalClosure
13. goingAway
14. internalServerError
15. invalidFramePayloadData
16. messageTooBig
17. missingMandatoryExtension
18. normalClosure
19. noStatusReceived
20. policyViolation
21. protocolError
22. reserved1004
23. reserved1015
24. unsupportedData