1. 构造函数
2. ForeignFetchEvent
3. 属性
4. bubbles
5. cancelable
6. composed
7. currentTarget
8. defaultPrevented
9. eventPhase
10. hashCode
11. isTrusted
12. matchingTarget
13. origin
14. path
15. request
16. runtimeType
17. target
18. timeStamp
19. type
20. 方法
21. composedPath
22. noSuchMethod
23. preventDefault
24. respondWith
25. stopImmediatePropagation
26. stopPropagation
27. toString
28. waitUntil
29. 操作符
30. 操作符 ==