把数值写到柱状图的柱顶上 大家可以任一修改和使用，也可以留下修改意思！ 引用时，请保留开发者版权，珍惜别人劳动成果！ -Numerical wrote the column on the histogram we can modify and use any one can modify the meaning of leaving! Reference, please retain the copyright developers, and treasure the result