如何在Vue app中更新chart js？

npm install chart.js vue-chartjs

import { Line } from 'vue-chartjs';
import Chart from 'chart.js';

export default {
  extends: Line,
  mounted() {
    this.renderChart({
      labels: ['January', 'February', 'March', 'April', 'May', 'June', 'July'],
      datasets: [
        {
          label: 'Data',
          backgroundColor: 'rgba(0, 123, 255, 0.5)',
          data: [10, 20, 30, 40, 50, 60, 70]
        }
      ]
    });
  }
}

<template>
  <div>
    <line-chart></line-chart>
  </div>
</template>

<script>
import LineChart from './LineChart.vue';

export default {
  components: {
    LineChart
  }
}
</script>

this.$data.datasets[0].data = [20, 30, 40, 50, 60, 70, 80];
this.$data._chart.update();