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图1是在小程序中的预览图， 图2是在真机模拟
这个是属于饼状图在小程序上的经典bug了。。。在原生小程序上也是这么个毛病。
解决方案1：不用饼状图 解决方案2：使用 cover-view 或者 cover-image 覆盖中间一部分 解决方案3：不用Echarts，换一个图表库
cover-view
cover-image
