使用echarts出现warning：“There is a chart instance already initialized on the dom.”

原因：在同一dom容器内，options配置项数据变动，多次渲染导致

解决方法： echarts.getInstanceByDom()

<div id="echarts" ref="echartsRef"></div

<script>
let myChart = echarts.getInstanceByDom(this.$refs.echartsRef)
if (myChart == null) {
  myChart = echarts.init(this.$refs.echartsRef)
}
const option = {}
myChart.setOption(option)
this.$once('hook:beforeDestroy', () => {
      myChart.dispose()
      myChart = null
  })
</script>