echarts 多条柱状图

下面是配置项：

barsOptions: {
        color: ["#ffdf25", "#36a9ce", "#d0e17d"],
        tooltip: {
          trigger: "axis",
          axisPointer: {
            type: "shadow",
          },
        },
        legend: {
          data: ["苯","甲苯","二甲苯","非甲烷总烃"],
          top: "0",
        },
        title: {
          text: "地市排放均值",
          left: "5%",
          top: "0%",
          textStyle: {
            fontSize: "14",
            color: "#000",
            fontStyle: "normal",
          },
        },
        grid: {
          left: "0%",
          right: "0%",
          bottom: "10%",
          top: "15%",
          containLabel: true,
        },
        calculable: true,
        xAxis: [
          {
            type: "category",
            axisTick: { show: false },
            data: [
              "郑州",
            "开封",
            "洛阳",
            "安阳",
            "三门峡",
            "新乡",
            "许昌",
            "济源",
            "郑州",
            "开封",
            "洛阳",
            "安阳",
            "焦作",
            "新乡",
            "许昌",
            "驻马店",
            "焦作",
            "新乡",
            ],
          },
        ],
        yAxis: [
          {
            type: "value",
            name: "mg/m³",
            nameLocation: "end",
          },
        ],
        series: [
          {
            name: "苯",
            type: "bar",
            barGap: 0,
            data: [320, 332, 301, 334, 390, 360, 320, 332, 301, 334, 390, 360,289,390,20,389,290,389],
          },
          {
            name: "甲苯",
            type: "bar",
            data: [220, 182, 191, 234, 290,320,220, 182, 191, 234, 290,320,330,289,390,20,389,290,389],
          },
          {
            name: "二甲苯",
            type: "bar",
            data: [150, 232, 201, 154, 190,150,150, 232, 201, 154, 190,150,160,289,390,20,389,290,389],
          },
          {
            name: "非甲烷总烃",
            type: "bar",
            data: [110, 222, 201, 154, 190,150,150, 232, 201, 154, 120,150,760,289,390,20,389,290,389],
          },
        ],
      },