因为饼图和直方图不能一起显示出来，所以饼图、直方图按钮及饼图和直方图的显示 需要屏蔽。实现方法：开始两按钮都能进行选择，选择其中一个按钮时显示其相关图-because pie and histogram can be displayed, pie, button histogram and pie and the histogram shows a need for shielding. Method : Start two buttons can choose, choose a but