需求:浏览器在上下滚动的过程中,如果距离顶部的滚动距离大于78px,吸顶导航就显示,如果小于78px就隐藏
1. 准备组件静态结构
view/Layout/components/LayoutFixed.vue
xml
<script setup>
</script>
<template>
<div class="app-header-sticky show">
<div class="container">
<RouterLink class="logo" to="/" />
<!-- 导航区域 -->
<ul class="app-header-nav ">
<li class="home">
<RouterLink to="/">首页</RouterLink>
</li>
<li>
<RouterLink to="/">居家</RouterLink>
</li>
<li>
<RouterLink to="/">美食</RouterLink>
</li>
<li>
<RouterLink to="/">服饰</RouterLink>
</li>
<li>
<RouterLink to="/">母婴</RouterLink>
</li>
<li>
<RouterLink to="/">个护</RouterLink>
</li>
<li>
<RouterLink to="/">严选</RouterLink>
</li>
<li>
<RouterLink to="/">数码</RouterLink>
</li>
<li>
<RouterLink to="/">运动</RouterLink>
</li>
<li>
<RouterLink to="/">杂项</RouterLink>
</li>
</ul>
<div class="right">
<RouterLink to="/">品牌</RouterLink>
<RouterLink to="/">专题</RouterLink>
</div>
</div>
</div>
</template>
<style scoped lang='scss'>
.app-header-sticky {
width: 100%;
height: 80px;
position: fixed;
left: 0;
top: 0;
z-index: 999;
background-color: #fff;
border-bottom: 1px solid #e4e4e4;
// 此处为关键样式!!!
// 状态一:往上平移自身高度 + 完全透明
transform: translateY(-100%);
opacity: 0;
// 状态二:移除平移 + 完全不透明
&.show {
transition: all 0.3s linear;
transform: none;
opacity: 1;
}
.container {
display: flex;
align-items: center;
}
.logo {
width: 200px;
height: 80px;
background: url("@/assets/images/logo.png") no-repeat right 2px;
background-size: 160px auto;
}
.right {
width: 220px;
display: flex;
text-align: center;
padding-left: 40px;
border-left: 2px solid $xtxColor;
a {
width: 38px;
margin-right: 40px;
font-size: 16px;
line-height: 1;
&:hover {
color: $xtxColor;
}
}
}
}
.app-header-nav {
width: 820px;
display: flex;
padding-left: 40px;
position: relative;
z-index: 998;
li {
margin-right: 40px;
width: 38px;
text-align: center;
a {
font-size: 16px;
line-height: 32px;
height: 32px;
display: inline-block;
&:hover {
color: $xtxColor;
border-bottom: 1px solid $xtxColor;
}
}
.active {
color: $xtxColor;
border-bottom: 1px solid $xtxColor;
}
}
}
</style>
然后引入到
- 获取滚动距离
安装vueuse
npm i @vueuse/core
用vueuse的函数来实现获取滚动的距离
3. 以滚动距离做判断条件控制组件盒子显示隐藏
核心逻辑:根据滚动距离判断当前show类名是否显示,大于78显示,小于78,不显示
view/Layout/components/LayoutFixed.vue
xml
<script setup>
// vueUse
import { useScroll } from '@vueuse/core'
const { y } = useScroll(window)
</script>
<template>
<!-- 以滚动距离做判断条件控制组件盒子显示隐藏 -->
<div class="app-header-sticky" :class="{ show: y > 78 }">
<!-- 省略部分代码 -->
</div>
</template>