设置图例不能点击

     option8: {
        color: ["#00CCFF", "#FE713A"],
        legend: {
          data: ["最高分", "最低分"],
          icon: "circle",
          selectedMode: false  /// 设置图例不能点击
        },
        grid: {
          left: "10%",
          right: "2%",
          bottom: "20%",
          top: "20%"
        },
        xAxis: [
          {
            type: "category",
            name: "每次考试时间",
            data: [],
            axisTick: {
              alignWithLabel: true
            },
            axisLabel: {
              textStyle: {
                color: "#333",
                fontSize: 12
              }
              // rotate: 38
            }
          }
        ],
        yAxis: [
          {
            type: "value",
            name: "分数"
          }
        ],
        series: [
          {
            name: "最高分",
            type: "bar",
            barWidth: "30%",
            data: []
          },
          {
            name: "最低分",
            type: "bar",
            barWidth: "30%",
            data: []
          }
        ]
      },