data () {
    return {
      windowHeight: window.innerHeight
    }
}

mounted () {
    window.onresize = () => {
      this.windowHeight = window.innerHeight
    }
}

watch: {
  'windowHeight': function (newVal, oldVal) { //監聽螢幕寬度變化
    this.windowHeight = newVal
    console.
 
log(newVal)
  }
}

---

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