题目1: 轮播的实现原理是怎样的?如果让你来实现,你会抽象出哪些函数(or接口)供使用?(比如 play())
题目2: 实现视频中的左右滚动无限循环轮播效果
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题目3: 实现一个渐变轮播效果, 效果范例492
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