自定义图例

       legend: {
          data: [
            // "最高分", "最低分"
            {
              name: "最高分",
              textStyle: {
                fontSize: 12,
                fontWeight: "bolder",
                color: "#cccccc"
              },
              //  自定义图例显示
              icon:
                "image://https://www.keaidian.com/uploads/allimg/190529/29103152_22.jpg"
            },
            {
              name: "最低分",
              textStyle: {
                fontSize: 12,
                fontWeight: "bolder",
                color: "#cccccc"
              },
              icon:
                "image://https://www.keaidian.com/uploads/allimg/190529/29103152_22.jpg"
            }
          ],
          icon: "circle",
          selectedMode: false /// 设置图例不能点击
        },