移動端頭部固定,上劃逐漸透明 (vue)

 

移動端頭部固定,上劃逐漸透明

<template>
  <div>
    <router-link tag="div" to="/" class="header-abs" v-show="showAbs">
      <div class="iconfont header-abs-back">&#xe624;</div>
    </router-link>
    <div class="header-fixed" v-show="!showAbs" :style="opacityStyle"
    >
      <router-link to="/">
        <div class="iconfont header-fixed-back">&#xe624;</div>
      </router-link>
 頁面頭部標題 </div>
  </div>
</template>

<script> export default { name: 'DetailHeader', data () { return { showAbs: true, opacityStyle: { opacity: 0 } } }, methods: {  handleScroll () { const top = document.documentElement.scrollTop if (top > 60) { let opacity = top / 140 opacity = opacity > 1 ? 1 : opacity this.opacityStyle = { opacity } this.showAbs = false } else { this.showAbs = true } } }, mounted () { window.addEventListener('scroll', this.handleScroll) }, unmounted () { window.removeEventListener('scroll', this.handleScroll) } } </script>

<style lang="stylus" scoped> @import '~styles/varibles.styl' .header-abs position: absolute left: .2rem top: .2rem width: .8rem height: .8rem line-height: .8rem border-radius: .4rem text-align: center background: rgba(0, 0, 0, .8) .header-abs-back color: #fff font-size: .4rem .header-fixed z-index: 2 position: fixed top: 0 left: 0 right: 0 height: $headerHeight line-height: $headerHeight text-align: center color: #fff background: $bgColor font-size: .32rem .header-fixed-back position: absolute top: 0 left: 0 width: .64rem text-align: center font-size: .4rem color: #fff </style>