1. 构造函数
2. BlobEvent
3. 属性
4. bubbles
5. cancelable
6. composed
7. currentTarget
8. data
9. defaultPrevented
10. eventPhase
11. hashCode
12. isTrusted
13. matchingTarget
14. path
15. runtimeType
16. target
17. timecode
18. timeStamp
19. type
20. 方法
21. composedPath
22. noSuchMethod
23. preventDefault
24. stopImmediatePropagation
25. stopPropagation
26. toString
27. 运算符
28. 运算符 ==