echarts使用，页面渲染不出来是什么原因？

Question

<template>
  <div class="echartscontainer">
    <div class="echarts" ref="chartThreeRef" style="width: 600px;height:400px;"></div>
  </div>
</template>

<script>
export default {
  data () {
    return {
      chartInstance: null,
      alldata: null
    }
  },
  created () {
    // this.getAllData()
    // this.updateDate()
  },
  mounted () {
    this.initCharts()
  },
  methods: {
    initCharts () {
      this.chartInstance = this.$echarts.init(this.$refs.chartThreeRef)
      const initOption = {
        title: {
          text: '折线图统计'
        },
        tooltip: {},
        legend: {
          data: ['销量']
        },
        xAxis: {
          data: ['衬衫', '羊毛衫', '雪纺衫', '裤子', '高跟鞋', '袜子']
        },
        yAxis: {},
        series: [
          {
            name: '销量',
            type: 'bar',
            data: [5, 20, 36, 10, 10, 20]
          }
        ]
      }
      this.chartInstance.setOption(initOption)
    }

Answer 1

可以出来，你看下你echarts正确引入没有，我这用的echarts5+的版本

import * as echarts from 'echarts'
Vue.prototype.$echarts = echarts

<template>
  <div class="echartscontainer">
    <div class="echarts"
         ref="chartThreeRef"
         style="width: 600px;height:400px;"></div>
  </div>
</template>

<script>
export default {
  data() {
    return {
      chartInstance: null,
      alldata: null
    }
  },
  created() {
    // this.getAllData()
    // this.updateDate()
  },
  mounted() {
    this.initCharts()
  },
  methods: {
    initCharts() {
      this.chartInstance = this.$echarts.init(this.$refs.chartThreeRef)
      const initOption = {
        title: {
          text: '折线图统计'
        },
        tooltip: {},
        legend: {
          data: ['销量']
        },
        xAxis: {
          data: ['衬衫', '羊毛衫', '雪纺衫', '裤子', '高跟鞋', '袜子']
        },
        yAxis: {},
        series: [
          {
            name: '销量',
            type: 'bar',
            data: [5, 20, 36, 10, 10, 20]
          }
        ]
      }
      this.chartInstance.setOption(initOption)
    }
  }
}
  </script>

Answer 2

<template>
<div class="echartscontainer">

<div class="echarts" ref="chartThreeRef" style="width: 600px; height: 400px"></div>

</div>
</template>

import * as echarts from "echarts";

data() {

return {
  chartInstance: null,
  alldata: null,
};

},

mounted() {

this.$nextTick(() => {
  this.initCharts();
});

},

initCharts() {

  this.chartInstance = echarts.init(this.$refs.chartThreeRef);
  const initOption = {
    title: {
      text: "折线图统计",
    },
    tooltip: {},
    legend: {
      data: ["销量"],
    },
    xAxis: {
      data: ["衬衫", "羊毛衫", "雪纺衫", "裤子", "高跟鞋", "袜子"],
    },
    yAxis: {},
    series: [
      {
        name: "销量",
        type: "bar",
        data: [5, 20, 36, 10, 10, 20],
      },
    ],
  };
  this.chartInstance.setOption(initOption);
},