vue3中运用echarts出现的一些问题解决

问题一：

ERROR

Cannot read properties of undefined (reading 'init') TypeError: Cannot read properties of undefined (reading 'init')

 错误原因：echarts引入方式不对

查看我的package.json文件，echarts版本是5

 解决方案：在组件中将echarts4的引入方式import echarts from 'echarts'改为echarts5的引入方式

 import * as echarts from 'echarts'

 问题二：

ERROR

Initialize failed: invalid dom.

错误原因：无效的dom。是代码中还未加载出dom，就已经开始了echarts的初始化

<script lang="ts" setup>
// echarts5的引用方式
import * as echarts from 'echarts'

const myChart = echarts.init(document.getElementById("main"))
let option = {
  xAxis: {
    type: 'category',
    data: ['Mon', 'Tue', 'Wed', 'Thu', 'Fri', 'Sat', 'Sun']
  },
  yAxis: {
    type: 'value'
  },
  series: [
    {
      data: [120, 200, 150, 80, 70, 110, 130],
      type: 'bar',
      showBackground: true,
      backgroundStyle: {
        color: 'rgba(180, 180, 180, 0.2)'
      }
    }
  ]
};
myChart.setOption(option)

</script>

解决方案：将echarts的运用放入onMounted（）中，或者将echarts的运用放入定时计时器中，延时加载

<script lang="ts" setup>
import { onMounted } from 'vue'
// echarts5的引用方式
import * as echarts from 'echarts'

onMounted( ()=>{
 const myChart = echarts.init(document.getElementById("main"))
 let option = {
  xAxis: {
    type: 'category',
    data: ['Mon', 'Tue', 'Wed', 'Thu', 'Fri', 'Sat', 'Sun']
  },
  yAxis: {
    type: 'value'
  },
  series: [
    {
      data: [120, 200, 150, 80, 70, 110, 130],
      type: 'bar',
      showBackground: true,
      backgroundStyle: {
        color: 'rgba(180, 180, 180, 0.2)'
      }
    }
  ]
};
 myChart.setOption(option)
})

</script>