Vue3一键回到顶部/底部

效果图：

 

 示例代码：

<template>  <div class="main">    <div class="box">这是第一个盒子</div>    <div class="box">这是第二个盒子</div>    <div class="box">这是第三个盒子</div>    <div class="box">这是第四个盒子</div>    <div ref="totop" class="totop" @click="scrollToTop">返回顶部</div>  </div></template><script setup lang="ts">const totop = ref();const scrollToTop = () => {  window.scrollTo({    // top: document.documentElement.offsetHeight, //回到底部    top: 0, //回到顶部    left: 0,    behavior: "smooth", //smooth 平滑；auto:瞬间  });};onMounted(() => {  // 页面滚动窗口监听事件  window.onscroll = function () {    // 获取浏览器卷去的高度    let high = document.documentElement.scrollTop || document.body.scrollTop; //兼容各浏览器    if (high >= 900) {      totop.value.style.display = "block";    } else {      totop.value.style.display = "none";    }  };});</script><style scoped lang="scss">.main {  .box {    width: 100vw;    margin: 10px auto;    background-color: rgb(173, 173, 173);    font-size: 50px;    text-align: center;    line-height: 400px;  }  .totop {    display: none;    position: fixed;    bottom: 100px;    right: 50px;    background-color: skyblue;    padding: 10px;    &:hover {      cursor: pointer;      color: #fff;    }  }}</style>

回到底部：

  window.scrollTo({    top: document.documentElement.offsetHeight, //回到底部    left: 0,    behavior: "smooth", //smooth 平滑；auto:瞬间  });

封装BackTop.vue组件

 

 components/BackTop.vue: 

<template>    <div ref="totop" class="totop" @click="scrollToTop" title="返回顶部">        <svg t="1681820716964" class="icon" style="display:block" viewBox="0 0 1024 1024" version="1.1"            xmlns="http://www.w3.org/2000/svg" p-id="6409" width="32" height="32">            <path                d="M866.7 96H157.3c-17.8 0-32.2 14.4-32.2 32.2 0 17.8 14.4 32.2 32.2 32.2h709.5c17.8 0 32.2-14.4 32.2-32.2 0-17.8-14.4-32.2-32.3-32.2zM512 225c-16.5 0-33 6.3-45.6 18.9L169.9 540.3c-5.8 5.8-9.4 13.9-9.4 22.8s3.6 17 9.4 22.8c5.8 5.8 13.9 9.4 22.8 9.4s17-3.6 22.8-9.4l264.2-264.2v574c0 17.8 14.4 32.2 32.2 32.2 17.8 0 32.2-14.4 32.2-32.2v-574l264.2 264.2c5.8 5.8 13.9 9.4 22.8 9.4s17-3.6 22.8-9.4c5.8-5.8 9.4-13.9 9.4-22.8s-3.6-17-9.4-22.8L557.6 243.9C545 231.3 528.5 225 512 225z"                fill="#ffffff" p-id="6410"></path>        </svg>    </div></template>   <script setup lang="ts">const totop = ref();const scrollToTop = () => {    window.scrollTo({        // top: document.documentElement.offsetHeight, //回到底部        top: 0, //回到顶部        left: 0,        behavior: "smooth", //smooth 平滑；auto:瞬间    });};onMounted(() => {    // 页面滚动窗口监听事件    window.onscroll = function () {        // 获取浏览器卷去的高度        let high = document.documentElement.scrollTop || document.body.scrollTop; //兼容各浏览器        if (high >= 500) {            totop.value.style.display = "block";        } else {            totop.value.style.display = "none";        }    };});</script>   <style scoped lang="scss">.totop {    display: none;    position: fixed;    bottom: 120px;    right: 80px;    background-color: #b0b0b0;    padding: 10px;    border-radius: 50%;    &:hover {        cursor: pointer;        background-color: #00000088;    }}</style>

然后直接在页面中使用<BackTop></BackTop>即可

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