Vue：window.onresize

1. 添加属性screenHeight 和 timer。

screenHeight: window.innerHeight

timer: '' //  window.onresize函数频繁调用时，页面抖动较大，设定间隔

2. 在mounted 钩子函数中监听onresize事件

let that = this

window.onresize = () => {

    if (!that.timer) {

        that.timer = true

        setTimeout(() => {

            that.timer = false

            that.screenHeight = window.innerHeight

        }, 600)

    }

}

3. h5 新单位 vh,vw