封装Backtop

在components下的新建BackToTop 文件夹，在文件夹下新建backToTop.vue

• backToTop.vue

<template>
  <div>
    <el-backtop
      :target="eleSelector"
      :bottom="50"
      :visibility-height="30"
      @click="backTop"
      :right="50"
    >
      <el-tooltip
        class="item"
        effect="dark"
        content="回到顶部"
        placement="left-start"
      >
        <div class="backto-top-icon-box">
          <el-button>
            <span class=" el-icon-arrow-up backto-top-icon"></span>
          </el-button>
        </div>
      </el-tooltip>
    </el-backtop>
  </div>
</template>
<script>
export default {
  props: ['eleSelector'],
  methods: {
    backTop () {
      this.$emit('backTop')
    }
  }
}
</script>
<style lang="scss">
.backto-top-icon-box {
  text-align: center;
  color: #fff;
  .el-button {
    background: #fff;
    color: #005d42;
    padding: 3px 8px 8px 8px;
    &:hover {
      background: #199965;
      border: none;
    }
    &:hover .backto-top-icon {
      color: #ececec;
    }
  }
  .backto-top-icon {
    font-size: 30px;
    color: gray;
  }
}
</style>

使用

• test.vue

<template>
  <div style="height:100vh;">
    <ul class="content-overflow-scroll">
      <li v-for="item in 50" :key="item">item</li>
    </ul>
    <back-to-top @backTop="backTop" :eleSelector="eleSelector"> </back-to-top>
  </div>
</template>
<script>
import BackToTop from '@/components/BackToTop/backToTop.vue'
export default {
  components: {
    BackToTop
  },
  data () {
    return {
      eleSelector: '.content-overflow-scroll'
    }
  },
  methods: {
    backTop () {
      console.log('这里执行的是，点击了回到顶部的时候，需要进行的操作。')
    }
  }
}
</script>
<style lang="scss">
.content-overflow-scroll {
  height:600px;
  overflow: auto;
  li {
    height: 50px;
    line-height: 50px;
    margin-bottom: 10px;
    border: 1px solid #ececec;
    text-align: center;
  }
}
</style>

备注：项目中装了sass和element。