Solve some problems in using echarts in vue3

Question one:

ERROR

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

 Error reason: echarts import method is wrong

Check my package.json file, echarts version is 5

 Solution: Change the introduction method of echarts4 from 'echarts' to the introduction method of echarts5 in the component

 import * as echarts from 'echarts'

 Question two:

ERROR

Initialize failed: invalid dom.

Reason for error: Invalid dom. It is because the dom has not been loaded in the code, and the initialization of echarts has already started

<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>

Solution: Put the application of echarts into onMounted(), or put the application of echarts into the timer, delay loading

<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>