首先mounted挂载监听

mounted(){window.addEventListener("scroll", this.handleScroll, true);}

methods创建监听方法

methods:{handleScroll(){let scrollTop = document.documentElement.scrollTop;//滚动高度let clientHeight = document.documentElement.clientHeight;//可视高度let scrollHeight = document.documentElement.scrollHeight;//内容高度console.log("滚动高度",scrollTop);console.log("可视高度",clientHeight);console.log("内容高度",scrollHeight);}},

滚动高度+可视高度==内容高度

ok！