如何在Vue.js中设置反应式窗口参数| window.innerWidth不是反应式窗口

computed: {
  windowWidth() {
    return window.innerWidth;
  }
}

mounted() {
  window.addEventListener('resize', this.handleResize);
},
methods: {
  handleResize() {
    this.$nextTick(() => {
      this.windowWidth = window.innerWidth;
    });
  }
}

<template>
  <div>
    <p>窗口宽度: {{ windowWidth }}</p>
  </div>
</template>