windowScroll 监听页面滚动

mounted() {
    window.addEventListener("scroll", this.windowScroll);//监听页面滚动
},
methods: {
    //页面滚动
            windowScroll() {
                let scrollTop = window.pageYOffset || document.documentElement.scrollTop || document.body.scrollTop;
                console.log(scrollTop) // 获取到页面滚动的值,
            },
},
destroyed() {
    window.removeEventListener("scroll", this.windowScroll);//销毁滚动事件
}