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PR 里主要是修正了 CanvasContext 的类型定义,然后补充了部分代码注释
由于我的编辑器在保存的时候还修改了部分代码的格式问题(主要是不正确的缩进),所以 review 起来可能会比较碍事… 如果需要修改的话请加 review 请求