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拖动滚动框 单击两端的滚动箭头 单击滚动框 单击滚动箭头与滚动框之间的滚动条
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滚动条失去焦点 滚动条获得焦点 设置滚动条的焦点 单击滚动条左端或右端的箭头
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拖动滚动条中滑块 单击滚动条中滑块 单击滚动条两端箭头 单击箭头与滑块之间的滚动条
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