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文档里只是举例了enter,exit事件,scroll事件该如何使用?scroll事件应该还会附带其他参数吧,能具体举个例子不,怎么使用事件附带的参数。我现在需要判断用户是往上滚还是往下滚,来动态展示或隐藏一个元素。请教下,该怎么办