[Canvas进阶](Canvas%E8%BF%9B%E9%98%B6.md) [canvas入门](canvas%E5%85%A5%E9%97%A8.md) [创建对象](%E5%88%9B%E5%BB%BA%E5%AF%B9%E8%B1%A1.md) [继承](%E7%BB%A7%E6%89%BF.md)