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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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当滚动框的位置改变时,触发Change事件 当拖动滚动条中的滚动框时,触发Scroll事件 LargeChange属性是滚动条的最大值 Value是滚动条中滚动框的当前值
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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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