canvas_animation
- https://www.w3cplus.com/canvas/draw-dashed-and-dotted-lines.html 画虚线
- http://www.cnblogs.com/wufangfang/p/6373972.html 画五角星
- http://blog.mn886.net/chenjianhua/show/1605b0e4ce96/index.html 算文本长度
- https://www.jb51.net/html5/443828.html canvas文本居中
- https://blog.csdn.net/lishihong108/article/details/52483867?ref=myread
- https://github.com/shiguang0116/gulp3-project
- https://www.jianshu.com/p/5239fe681fe3 文本比对
- https://github.com/google/diff-match-patch 文本比对
- https://www.cnblogs.com/jpfss/p/9105119.html