echarts 实现线图上面区分不同的圆点

// 在数据里面 处理symbol和symbolSize
 if (item.substract != null) {
              state.volumeStockData.push({
                value: Number((item.indRate * 100).toFixed(2)),
                symbol: "circle",
                symbolSize: 6,
                itemStyle: {
                  color: "#6BF95B",
                },
              });
            } else if (item.add != null) {
              state.volumeStockData.push({
                value: Number((item.indRate * 100).toFixed(2)),
                symbol: "circle",
                symbolSize: 6,
                itemStyle: {
                  color: "#F75A59",
                },
              });
            }
 //options里面设置 symbol
        series: [
          {
            name: name2,
            type: "line",
            yAxisIndex: isRate ? 0 : 1,
            data: state.volumeStockData,
            showAllSymbol: true,
            symbol: () => {
              return "none";
            },
          },
        ],