zhongde-website/components/common/backTop.vue

<template>
  <div class="backTop" v-if="backTopIsShow">
    <div class="luojigouLogo">
      <img src="http://luojigou-app-commit-pic.luojigou.vip/FvmYmQjjoZftM_fiRYGM0lsC9vfw?imageView2/0/q/50|imageslim" alt="">
    </div>
    <el-popover
      placement="right"
      trigger="hover">
      <img  width="150px" src="http://luojigou-app-commit-pic.luojigou.vip/FtIexWC2MZD5jk8YFf6OG11MQUGC?imageView2/0/q/50|imageslim" alt="" srcset="">
      <div slot="reference" class="hotline">
        <div class="hotLineImg"></div>
      </div>
    </el-popover>
    <div class="line"></div>
    <el-popover
      placement="right"
      trigger="hover">
      <img  width="150px" src="http://luojigou-app-commit-pic.luojigou.vip/FsMJj5IIlzzeDqoOyq0VSUfJ1Cy0?imageView2/0/q/50|imageslim" alt="" srcset="">
      <div slot="reference" class="public">
        <div class="publicImg"></div>
      </div>
    </el-popover>
    <div class="line"></div>
    <div v-show="backTopIsShow" class="backTopBtn" @click="backTop">
      <img src="http://luojigou-app-commit-pic.luojigou.vip/Fnz0K17ERo2g1foAvu9KAnAOmw7O?imageView2/0/q/50|imageslim" />
    </div>
  </div>
</template>

<script>
export default {
  name: 'backTop',
  data() {
    return {
      backTopIsShow: false,
    }
  },
  mounted() {
    this.backTopIsShow = true;
    //获取当前的页面滚动事件，然后执行 this.showheader事件
    window.addEventListener('scroll', this.showheader);
  },
  destroyed() {
    window.removeEventListener('scroll', this.showheader);
  },
  methods: {
    showheader() {
      //当前屏幕等于多少执行的事件
      var scrollTop = window.pageYOffset || document.documentElement.scrollTop || document.body.scrollTop;
      this.scrollTop = scrollTop
      // console.log(scrollTop)
      if (scrollTop > 541) {
        //当屏幕大于541的时候，就显示，小于则不显示
        this.backTopIsShow = true;
      } else {
        this.backTopIsShow = false;
      }
    },
    backTop() {
      //返回头部的动画
      const that = this
      let timer = setInterval(() => {
        let ispeed = Math.floor(-that.scrollTop / 7)
        document.documentElement.scrollTop = document.body.scrollTop = that.scrollTop + ispeed
        if (that.scrollTop === 0) {
          clearInterval(timer)
        }
      }, 10)
    }
  }
}
</script>

<style lang="scss" scoped>
.backTop {
  position: fixed;
  right: 60px;
  top: 580px;
  z-index: 99999;
  width: 70px;
  // height: 140px;
  background: #FFFFFF;
  border-radius: 4px;
  border: 1px solid rgba(230, 230, 230, 0.8);
  .luojigouLogo {
    position: absolute;
    top: -55px;
    left: 4px;
    img {
      width: 60px;
      object-fit: cover;
    }
  }
  .hotline,
  .public {
    display: flex;
    justify-content: center;
    align-items: center;
    width: 70px;
    height: 70px;
    .hotLineImg,
    .publicImg {
      width: 42px;
      height: 42px;
      background-image: url("http://luojigou-app-commit-pic.luojigou.vip/FoDd0oKYmp80U910lSiWLV1m-X-K?imageView2/0/q/50|imageslim");
      background-size: cover;
      background-repeat: no-repeat;
    }
    .publicImg {
      width: 32px;
      height: 44px;
      background-image: url("http://luojigou-app-commit-pic.luojigou.vip/FpTOXAo-IzAhMYZjZpCurY9qcsKw?imageView2/0/q/50|imageslim");
    }
  }
  .hotline:hover {
    .hotLineImg {
      background-image: url("http://luojigou-app-commit-pic.luojigou.vip/FtSGYGjwNcNnFXB9jZshFqz7HgBy?imageView2/0/q/50|imageslim");
    }
  }
  .public:hover {
    .publicImg {
      background-image: url("http://luojigou-app-commit-pic.luojigou.vip/FuIGVjGkZi_R_7FuswrgnDWCQ0he?imageView2/0/q/50|imageslim");
    }
  }
  .line {
    height: 1px;
    background-color: rgba(230, 230, 230, 0.8);
  }
  .backTopBtn {
    display: flex;
    justify-content: center;
    align-items: center;
    width: 70px;
    height: 46px;
    img {
      width: 22px;
    }
  }
}
</style>