1. 构造函数
2. TouchEvent
3. 属性
4. altKey
5. bubbles
6. cancelable
7. changedTouches
8. composed
9. ctrlKey
10. currentTarget
11. defaultPrevented
12. detail
13. eventPhase
14. hashCode
15. isTrusted
16. matchingTarget
17. metaKey
18. path
19. runtimeType
20. shiftKey
21. sourceCapabilities
22. target
23. targetTouches
24. timeStamp
25. touches
26. type
27. view
28. 方法
29. composedPath
30. noSuchMethod
31. preventDefault
32. stopImmediatePropagation
33. stopPropagation
34. toString
35. 操作符
36. 操作符 ==
37. 静态属性
38. supported