Echarts 环形图 每项之间有间隙

option = {
  tooltip: {
    trigger: 'item'
  },
  legend: {
    top: '5%',
    left: 'center',
    textStyle:{
      color:'#fff'
    }
  },
  backgroundColor:"#000",
 color:["#EEF16C", "#FD583E", "#0D4197"],
  series: [
    {
      name: 'Access From',
      type: 'pie',
      radius: ['40%', '50%'],
      avoidLabelOverlap: false,
      // 中间的间隙,实际是borderColor,
      // itemStyle内的borderColor和backgroundColor一致,便可营造间隙效果
      itemStyle: {
        borderRadius: 10,
        borderColor: '#000',
        borderWidth: 10
      },
      label: {
        show: false,
        position: 'center'
      },
      emphasis: {
        label: {
          show: true,
          fontSize: '20',
          fontWeight: 'bold'
        }
      },
      labelLine: {
        show: false
      },
      data: [
        { value: 25, name: '超危'},
        { value: 15, name: '高危'  },
        { value: 85, name: '其他' },

      ]
    }
  ]
};