1. 构造函数
  2. KeyEvent
  3. 包装
  4. 属性
  5. altKey
  6. bubbles
  7. cancelable
  8. charCode
  9. code
  10. composed
  11. ctrlKey
  12. currentTarget
  13. defaultPrevented
  14. detail
  15. eventPhase
  16. hashCode
  17. isComposed
  18. isComposing
  19. isTrusted
  20. key
  21. keyCode
  22. location
  23. matchingTarget
  24. metaKey
  25. path
  26. repeat
  27. runtimeType
  28. shiftKey
  29. sourceCapabilities
  30. target
  31. timeStamp
  32. type
  33. view
  34. which
  35. wrapped
  36. 方法
  37. composedPath
  38. getModifierState
  39. noSuchMethod
  40. preventDefault
  41. stopImmediatePropagation
  42. stopPropagation
  43. toString
  44. 运算符
  45. 运算符 ==
  46. 静态属性
  47. canUseDispatchEvent
  48. keyDownEvent
  49. keyPressEvent
  50. keyUpEvent