vue中子组件的methods中获取到props中的值方法

<template>
  <div>
    <head-></head->
    <section class="data_section">
      <header class="chart-title">数据统计</header>
      <el-row :gutter="20" class="chart-head">
        <el-col :xs="24" :sm="12" :md="6" :lg="6"><div class="grid-content data-head blue-head">统计</div></el-col>
        <el-col :xs="24" :sm="12" :md="6" :lg="6"><div class="grid-content data-head">销售数量 <span>{{number}}</span></div></el-col>
        <el-col :xs="24" :sm="12" :md="6" :lg="6"><div class="grid-content data-head">销售金额 <span>{{amount}}</span></div></el-col>
        <el-col :xs="24" :sm="12" :md="6" :lg="6"><div class="grid-content data-head">利润统计 <span>{{profits}}</span></div></el-col>
      </el-row>
    </section>
    <chart :chartData="chartData"></chart>
  </div>
</template>

<script>
  data(){
      return {
        number: null,
        amount: null,
        profits: null,
        chartData: [10,10,10]
      }
    },
</script>

export default {
  props: ['chartData']
}

<script>
  data(){
      return {
        number: null,
        amount: null,
        profits: null,
        chartData: []
      }
    },
    mounted(){
      this.getStatistics();
    },
    methods: {
      //获取统计数据
      getStatistics(){
        console.log('获取统计数据')
        axios.post(api,{

        }).then((res) => {
          this.number = res.data.domain.list[0].number;
          this.amount = res.data.domain.list[0].amount;
          this.profits = res.data.domain.list[0].profits;
          this.chartData = [this.number,this.amount,this.profits];
        }).catch((err) => {
          console.log(err);
        })
      },
    },
</script>

props: ['chartData'],
    data(){
      return {
        cData: []
      }
    },
    watch: {
      chartData: function(newVal,oldVal){
        this.cData = newVal; //newVal即是chartData
        this.drawChart();
      }
    },