data{
oldScrollTop: 0, //记录上一次滚动结束后的滚动距离
scrollTop: 0 ,// 记录当前的滚动距离
}

watch: {scrollTop(newValue, oldValue) {setTimeout(() => {if(newValue == window.scrollY) { //延时执行后当newValue等于window.scrollY，代表滚动结束console.log('滚动结束');this.oldScrollTop = newValue; //每次滚动结束后都要给oldScrollTop赋值this.tran_flag=true;};}, 200); //必须使用延时器，否则每次newValue和window.scrollY都相等，无法判断，20ms刚好大于watch的侦听周期，故延时20msif(this.oldScrollTop == oldValue) { //每次滚动开始时oldScrollTop与oldValue相等console.log('滚动开始');this.tran_flag=false;}}},

methods: {handleScroll() {window.addEventListener('scroll', () => {this.scrollTop = window.scrollY;})},}

beforeDestroy() {window.removeEventListener('scroll',() => {this.scrollTop = window.scrollY;}); //离开当前组件别忘记移除事件监听哦}