双层pie增加立体感

描述:当前是关于Echarts图表中的 饼图 示例。
 
            option = {
   color: ['#EE6666', '#73C0DE'],
   title: {
      textStyle: {
         color: "white",
         // fontSize:'18px'
      },
      top: '0%',
      left: '0%'
   },
   series: [
      {
         type: 'pie',
         radius: ['55%', '90%'],
         avoidLabelOverlap: false,
         z: 3,
         itemStyle: {
            borderRadius: 10,
            borderColor: '#fff',
            borderWidth: 0
         },
         label: {
            show: false,
            position: 'inside',
            textStyle: {
               fontSize: 14
            },
            formatter: '{b}:{c}'
         },
         labelLine: {
            show: false
         },
         data: [
            { value: 80, name: '1' },
            {
               value: 20, name: '2', itemStyle: {
                  color: 'rgba(0,244,255,1)'
               }
            },
         ]
      },
      {
         type: 'pie',
         radius: ['55%', '90%'],
         avoidLabelOverlap: false,
         right: '2%',
         bottom: '2%',
         z: 2,
         itemStyle: {
            borderRadius: 10,
            borderColor: '#fff',
            borderWidth: 0
         },
         label: {
            show: false,
         },
         labelLine: {
            show: false
         },
         data: [
            {
               value: 80, name: '1',
               itemStyle: {
                  color: '#009ad6'
               }
            },
            {
               value: 20, name: '2',
               itemStyle: {
                  color: '#009ad6'
               }
            },
         ]
      }
   ]
};