fx66/src/components/header.vue

<template>
    <div class="header-container" :class="{'offset':isOffset}">
      <div class="inner-container">
        <img class="brand" :src="isOffset?require('../assets/logo-rev.png'):require('../assets/mainLogo.png')"/>
        <ul class="header-tab">
          <li class="header-tab-item active">首页</li>
          <li class="header-tab-item">申请代理</li>
        </ul>
      </div>
    </div>
</template>

<script>
    export default {
      name: "headerComponent",
      data(){
        return{
          isOffset:false,
        }
      },
      mounted(){
        window.addEventListener('scroll',this.scrollListener)
      },
      methods:{
        scrollListener(e){
          this.isOffset=!!window.pageYOffset;

          // console.log(window.pageYOffset);
        }
      }

    }
</script>

<style scoped lang="less">
  @import "../assets/less/_variable.less";
  .header-container{
    transition: all 0.25s ease;
    position: fixed;
    width: 100%;
    height: 80px;
    background-color: rgba(0, 0, 0, 0.2);
    z-index: 9;
  }
  .inner-container{
    position: relative;
    width: 1200px;
    margin: 0 auto;
    display: flex;
    flex-direction: row;
    & .brand{
      position: absolute;
      width: 100px;
      height: 33px;
      top: 50%;
      transform: translateY(-50%);
    }
    & .header-tab{

      margin-left: 135px;
      display: flex;
      flex-direction: row;
      & .header-tab-item{
        font-size: 14px;
        width: 100px;
        height: 80px;
        line-height: 80px;
        cursor: pointer;
        color: white;
        &.active{
          color: @primaryBlue;
          background-color: white;
        }
      }
    }

  }
  .header-container.offset{

    background-color: white;
    & .header-tab .header-tab-item {

      color: black;
      &.active {
        background-color: @primaryBlue;
        color: white;
      }
    }
  }
</style>