Echarts实现折线图时不显示

 showchart() {
      riverChart()
        .then((res) => {
          this.dateTime = res[0];
          this.ql = res[1];
          this.wrz = res[2];
          this.zl == res[3];
          console.log(this.dateTime)
          console.log(this.ql)
        })
        .catch((error) => {
          this.$message.error(error);
        });

      this.chartLine = echarts.init(document.getElementById("chartLineBox"));

      var option = {
        title: {
          text: "Stacked Line",
        },
        tooltip: {
          trigger: "axis",
        },
        legend: {
          data: ["水位", "警戒水位", "流量"],
        },
        grid: {
          left: "3%",
          right: "4%",
          bottom: "3%",
          containLabel: true,
        },
        toolbox: {
          feature: {
            saveAsImage: {},
          },
        },
        xAxis: {
          type: "category",
          boundaryGap: false,
          data: this.dateTime,
        },
        yAxis: {
          type: "value",
        },
        series: [
          {
            name: "水位",
            data: this.zl,
            type: "line",
            stack: "Total",
          },
          {
            name: "警戒水位",
            data: this.wrz,
            type: "line",
            stack: "Total",
          },
          {
            name: "流量",
            data: this.ql,
            type: "line",
            stack: "Total",
          },
        ],
      };

      this.chartLine.setOption(option);
    },

使用从后端获取的数据，折线图不显示，使用直接写的一个数组数据显示，这是为什么呀？

你的数据格式问题 你传的是字符串 要使用number类型 你可以拿到数字之后用parseInt处理一下