echarts宽度是设置的百分百，怎么图表出来只有这么点了？

<div id="main2" style="width: 100%; height: 340px"></div>


main2() {
      let main2 = echarts.init(document.getElementById("main2"));
      main2.setOption({
        legend: {
          text: ["峰时", "平时", "谷时"],
          textStyle: {
            color: "#fff", //legend字体颜色
          },
        },
        grid: {
          top: 25,
          left: 75,
          bottom: 20,
          //top:4,
          // x: 50,
          // y2: 30
        },
        tooltip: {
          trigger: "axis",
          position: function (pt) {
            return [pt[0], "10%"];
          },
        },
        lineStyle: {
          normal: {
            color: "#32A8FF",
          },
        },
        xAxis: {
          boundaryGap: false,
          type: "category",
          // data: this.xAxisData2,
          data: ["08月", "09月", "10月", "11月"],
          axisLabel: {
            textStyle: {
              color: "#fff",
            },
          },
          axisLine: {
            lineStyle: {
              color: "#0ec2c1",
              width: 2,
            },
          },
          axisTick: {
            show: true,
          },
        },
        yAxis: {
          splitNumber: 3,
          axisLabel: {
            show: true,
            textStyle: {
              color: "#fff",
            },
          },
          //// y轴的颜色和宽度
          axisLine: {
            lineStyle: {
              color: "#0ec2c1",
              width: 2,
            },
          },
          splitLine: {
            lineStyle: {
              color: ["#074545"],
              type: "dashed",
            },
          },
        },
        series: [
          {
            name: "峰时",
            type: "line",
            // data: this.seriesData2,
            data: [10, 6, 8, 5],
            areaStyle: { type: "default" },
            itemStyle: {
              color: new echarts.graphic.LinearGradient(0, 0, 0, 1, [
                {
                  offset: 0,
                  color: "rgba(216,129,152,1)",
                },
                {
                  offset: 0.5,
                  color: "rgba(216,129,152,.5)",
                },
                {
                  offset: 1,
                  color: "rgba(216,129,152,0)",
                },
              ]),
            },
          },
          {
            name: "平时",
            type: "line",
            // data: this.seriesData2,
            data: [10, 6, 8, 5],
            areaStyle: { type: "default" },
            itemStyle: {
              color: new echarts.graphic.LinearGradient(0, 0, 0, 1, [
                {
                  offset: 0,
                  color: "rgba(88,213,194,1)",
                },
                {
                  offset: 0.5,
                  color: "rgba(88,213,194,.5)",
                },
                {
                  offset: 1,
                  color: "rgba(88,213,194,0)",
                },
              ]),
            },
          },
          {
            name: "谷时",
            type: "line",
            // data: this.seriesData2,
            data: [10, 6, 8, 5],
            areaStyle: { type: "default" },
            itemStyle: {
              color: new echarts.graphic.LinearGradient(0, 0, 0, 1, [
                {
                  offset: 0,
                  color: "rgba(206,228,98,1)",
                },
                {
                  offset: 0.5,
                  color: "rgba(206,228,98,.5)",
                },
                {
                  offset: 1,
                  color: "rgba(206,228,98,0)",
                },
              ]),
            },
          },
        ],
        // color:
      });
    },

看一下main2 div 的父级的宽度是多少，设置了main2的宽度为100%，宽度为父级的宽度的100%。