Vue实现Header渐隐渐现效果的实例代码

<template>
 <div class="header">
 <router-link tag="div" to="/" class="header-abs">
 <div class="iconfont header-abs-back">&#xe685;</div>
 </router-link>
 <div class="header-fixed">
 <div class="header">
 景点详情
 <router-link to="/">
  <div class="iconfont header-fixed-back">&#xe685;</div>
 </router-link>
 </div>
 </div>
 </div>
</template>

<script>
export default {
 name: 'DetailHeader'
}
</script>

<style lang="scss" scoped>
@import '~styles/varibles.scss';
.header-abs {
 position: absolute;
 left: 0.2rem;
 top: 0.2rem;
 width: 0.8rem;
 height: 0.8rem;
 line-height: 0.8rem;
 text-align: center;
 border-radius: 0.4rem;
 background: rgba(0, 0, 0, 0.8);
 .header-abs-back {
 color: #fff;
 font-size: 0.4rem;
 }
}
.header-fixed {
 position: fixed;
 top: 0;
 left: 0;
 right: 0;
 height: $HeaderHeight;
 line-height: $HeaderHeight;
 text-align: center;
 color: #fff;
 background: $bgColor;
 .header-fixed-back {
 position: absolute;
 top: 0;
 left: 0;
 color: #fff;
 width: 0.64rem;
 text-align: center;
 font-size: 0.4rem;
 }
}
</style>

element.addEventListener(event, function, useCapture);

<template>
 <div class="header">
 <router-link tag="div" to="/" class="header-abs" v-show="showAbs">
 <div class="iconfont header-abs-back">&#xe685;</div>
 </router-link>
 <div class="header-fixed" v-show="!showAbs" :style="opacityStyle">
 <div class="header">
 景点详情
 <router-link to="/">
  <div class="iconfont header-fixed-back">&#xe685;</div>
 </router-link>
 </div>
 </div>
 </div>
</template>

<script>
export default {
 name: 'DetailHeader',
 data() {
 return {
 showAbs: true,
 opacityStyle: {
 opacity: 0
 }
 }
 },
 methods: {
 handleScroll() {
 console.log('scroll')
 // console.log(document.documentElement.scrollTop)
 const top = document.documentElement.scrollTop
 if (top > 60) {
 let opacity = top / 140
 // 让 opacity 最大值只能是 1
 opacity = opacity > 1 ? 1 : opacity
 this.opacityStyle = { opacity }
 this.showAbs = false
 } else {
 this.showAbs = true
 }
 }
 },
 activated() {
 window.addEventListener('scroll', this.handleScroll)
 },
 deactivated() {
 window.removeEventListener('scroll', this.handleScroll)
 }
}
</script>

<style lang="scss" scoped>
@import '~styles/varibles.scss';
.header-abs {
 position: absolute;
 left: 0.2rem;
 top: 0.2rem;
 width: 0.8rem;
 height: 0.8rem;
 line-height: 0.8rem;
 text-align: center;
 border-radius: 0.4rem;
 background: rgba(0, 0, 0, 0.8);
 .header-abs-back {
 color: #fff;
 font-size: 0.4rem;
 }
}
.header-fixed {
 position: fixed;
 top: 0;
 left: 0;
 right: 0;
 height: $HeaderHeight;
 line-height: $HeaderHeight;
 text-align: center;
 color: #fff;
 background: $bgColor;
 .header-fixed-back {
 position: absolute;
 top: 0;
 left: 0;
 color: #fff;
 width: 0.64rem;
 text-align: center;
 font-size: 0.4rem;
 }
}
</style>