How to refresh canvas by click in vue.js?

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<template>
  <div>
    <canvas ref="canvas"></canvas>
    <button @click="refreshCanvas">Refresh Canvas</button>
  </div>
</template>

<script>
export default {
  data() {
    return {
      canvas: null,
      ctx: null
    };
  },
  mounted() {
    this.canvas = this.$refs.canvas;
    this.ctx = this.canvas.getContext('2d');
    
    // draw initial canvas content here
    this.ctx.fillStyle = 'red';
    this.ctx.fillRect(10, 10, 50, 50);
  },
  methods: {
    refreshCanvas() {
      // clear the canvas
      this.ctx.clearRect(0, 0, this.canvas.width, this.canvas.height);

      // draw new content
      this.ctx.fillStyle = 'blue';
      this.ctx.fillRect(30, 30, 50, 50);
    }
  }
};
</script>