VUE更换背景颜色的方法

<template>
  <div>
    <h1>当前背景颜色：{{ backgroundColor }}</h1>
    <div>
      <button @click="setBackgroundColor('red')">红色</button>
      <button @click="setBackgroundColor('green')">绿色</button>
      <button @click="setBackgroundColor('blue')">蓝色</button>
    </div>
  </div>
</template>
<script>
export default {
  data() {
    return {
      backgroundColor: 'white',
    };
  },
  methods: {
    setBackgroundColor(color) {
      this.backgroundColor = color;
      document.body.style.backgroundColor = color;
    },
  },
};
</script>

<template>
  <div>
    <h1>我的网站</h1>
    <background-control></background-control>
  </div>
</template>
<script>
import BackgroundControl from './BackgroundControl.vue';
export default {
  components: {
    'background-control': BackgroundControl,
  },
};
</script>

button {
  padding: 10px;
  margin-right: 10px;
  border: none;
  border-radius: 5px;
  color: white;
  font-size: 16px;
}
button.red {
  background-color: red;
}
button.green {
  background-color: green;
}
button.blue {
  background-color: blue;
}