.vue//用于判断按钮何时显示 div classbtn-top v-ifscrollHeight alarmHeight el-button typeinfo iconel-icon-arrow-up clickbtnTop /el-button /div.jsmounted() { this.alarmHeight document.body.clientHeight; window.addEventListener(scroll, this.handleScroll);//添加鼠标滚动事件 }, //销毁之前移除鼠标滚动事件 beforeDestroy () { window.removeEventListener(scroll, this.handleScroll) }, methods: { btnTop(){ document.documentElement.scrollTop-30; if (document.documentElement.scrollTop0) { var csetTimeout(()this.btnTop(),16); }else { clearTimeout(c); //移除setTimeout } }, handleScroll(){ this.scrollHeight this.alarmHeight*2/3 document.documentElement.scrollTop || document.body.scrollTop; }, }效果