Problem in passing value from parent component to child component echarts in Vue

Record the problem of echarts stepping on the trap

#Problem: When the parent component passes the value to the child component echarts, it is found that the child component obtains The props were empty. At first I thought the hook function was in the wrong place, but later I found that neither mounted nor created worked. When the data passed in the parent component data is defined, the child component displays normally

Cause: After investigation later, the N word was omitted here, and it was found that echarts passes the data during rendering

Solution Solution: Define a flag in the parent component, and then render the subcomponent after the data is obtained

//父组件 
  
 ... export default { name: 'device', data() { return { flag:false, piedata:{}, ... }, created(){ this.init() }, methods:{ init(){ axios.get('/static/mock/status/pie.json').then(this.getInfoSucc) }, getInfoSucc(res){ res = res.data; if(res.code ==0){ const values = res.values; this.piedata = values.piedata; this.flag = true } }

//子组件

Then the subcomponent will be displayed normally

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