vue中使用echarts渲染不出來

<template>
  <div id="app" class="login_area">
    <div id="myChart" class="echarts"></div>
  </div>
</template>

<script>
  export default {
    name: 'second',
    data () {
      return {
          dataList:[],
          time:[],
          datas:[]
      }
    },
created: function () {
  this.$axios.get("xxxx").then(res => {
    this.dataList=res.data.result.group;
    this.dataList.sort((a,b)=>{
      return b.index - a.index
    });
    for(var value of this.dataList){
        this.time.push(value.recharge_day)
        this.datas.push(Number(value.mount))
    }
  });
},
mounted(){
  this.drawLine();
},
methods: {
  drawLine(){
    let that=this;
    console.log(that.time)
    console.log(that.datas)
    let myChart = this.$echarts.init(document.getElementById('myChart'));
    myChart.setOption({
      color: ['#90bcf3'],
      tooltip: {
        trigger: 'axis'
      },
      legend: {
        data: ['收益/元'],
        left: 20,
        top: 20,
        textStyle: {
          color: ['#90bcf3']
        }
      },
      toolbox: {
        show: false,
        feature: {
          mark: {show: true},
          dataView: {show: true, readOnly: false},
          magicType: {show: true, type: ['line', 'bar', 'stack', 'tiled']},
          restore: {show: true},
          saveAsImage: {show: true}
        }
      },
      calculable: true,
      xAxis: [
        {
          type: 'category',
          name: '日期',
          boundaryGap: false,
          data: that.time,
          axisLine: {
            lineStyle: {
              color: ['#90bcf3']
            }
          },
          axisLabel: {
            textStyle: {
              color: ['#000']
            }
          }
        }
      ],
      yAxis: [
        {
          type: 'value',
          axisLine: {
            lineStyle: {
              color: ['#90bcf3']
            }
          },
          axisLabel: {
            textStyle: {
              color: ['#000']
            }
          }
        }
      ],
      series: [
        {
          name: '收益/元',
          type: 'line',
          smooth: true,//平滑
          stack: '總量',
          data: that.datas
        }
      ]
    });
  }
}
  }
</script>


<style scoped>
.echarts{
  width: 700px;
  height: 300px;
}
</style>

打印數(shù)據(jù)：

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求大佬指點哪里出問題了呢？