为什么我这个滚动每次向上滚动当箭头所指的位置到达顶部导师动态的灰色框框的时候就不滚了，直接又来一遍滚动，他不是把这整个粉红色的框框从上往下慢慢遮住那种感觉，求大神指导啊，在线等，急

        
        
        
        
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