1. 属性
2. 对齐
3. hashCode
4. meetOrSlice
5. runtimeType
6. 方法
7. noSuchMethod
8. toString
9. 运算符
10. 运算符 ==
11. 常量
12. SVG_MEETORSLICE_MEET
13. SVG_MEETORSLICE_SLICE
14. SVG_MEETORSLICE_UNKNOWN
15. SVG_PRESERVEASPECTRATIO_NONE
16. SVG_PRESERVEASPECTRATIO_UNKNOWN
17. SVG_PRESERVEASPECTRATIO_XMAXYMAX
18. SVG_PRESERVEASPECTRATIO_XMAXYMID
19. SVG_PRESERVEASPECTRATIO_XMAXYMIN
20. SVG_PRESERVEASPECTRATIO_XMIDYMAX
21. SVG_PRESERVEASPECTRATIO_XMIDYMID
22. SVG_PRESERVEASPECTRATIO_XMIDYMIN
23. SVG_PRESERVEASPECTRATIO_XMINYMAX
24. SVG_PRESERVEASPECTRATIO_XMINYMID
25. SVG_PRESERVEASPECTRATIO_XMINYMIN