项目用vue版本是2.0的，项目中用到es6

• 首先需要在data里面定义页面的高度

data (){
    return {
        fullHeight: document.documentElement.clientHeight
    }
}

• 把window.onresize事件挂在到mounted

 mounted() {
      const that = this
      window.onresize = () => {
        return (() => {
          window.fullHeight = document.documentElement.clientHeight
          that.fullHeight = window.fullHeight
        })()
      }
    }

• 监听window.onresize事件

 watch: {
      fullHeight (val) {
        if(!this.timer) {
          this.fullHeight = val
          this.timer = true
          let that = this
          setTimeout(function (){
            that.timer = false
          },400)
        }
      }
    }

这里的定时器是为了优化，如果频繁调用window.onresize方法会造成页面卡顿，增加定时器会避免频繁调用window.onresize方法