如何在vue中将chart.js图形导出为svg？

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

export default {
  extends: Line,
  mounted() {
    this.renderChart(data, options);
  }
}

methods: {
  exportChart() {
    const canvas = this.$refs.chart.chart.canvas;
    const svg = canvas.toDataURL('image/svg+xml');
    const link = document.createElement('a');
    link.href = svg;
    link.download = 'chart.svg';
    link.click();
  }
}

<template>
  <div>
    <canvas ref="chart"></canvas>
    <button @click="exportChart">导出SVG</button>
  </div>
</template>