vue2-perfect-scrollbar滚动条

cnpm i -S vue2-perfect-scrollbar

import PerfectScrollbar from 'vue2-perfect-scrollbar'
import 'vue2-perfect-scrollbar/dist/vue2-perfect-scrollbar.css'
Vue.use(PerfectScrollbar)

<template>
  <div class="aside">
    <div class="aside-header">
      <img
        src="https://lj-common.oss-cn-chengdu.aliyuncs.com/vue.png"
        style="width: 30px; height: 30px"
      />
      <span
        style="
          font-size: 20px;
          font-weight: 600;
          color: white;
          margin-left: 10px;
        "
        >xxx</span
      >
    </div>
    <div class="aside-menu">
      <perfect-scrollbar @ps-scroll-y="onScroll" ref="scrollbar">
        <el-menu
          default-active="1"
          class="el-menu-vertical-demo"
          background-color="#191A23"
          text-color="#fff"
          active-text-color="white"
        >
          <el-menu-item index="1" @click="$router.push({ path: '/download' })">
            <span slot="title">demo</span>
          </el-menu-item>
 
          <el-menu-item index="3"> <span slot="title">test</span> </el-menu-item
          ><el-menu-item index="3">
            <span slot="title">test</span>
          </el-menu-item>
          <el-menu-item index="3"> <span slot="title">test</span> </el-menu-item
          ><el-menu-item index="3">
            <span slot="title">test</span> </el-menu-item
          ><el-menu-item index="3">
            <span slot="title">test</span> </el-menu-item
          ><el-menu-item index="3">
            <span slot="title">test</span> </el-menu-item
          ><el-menu-item index="3">
            <span slot="title">test</span> </el-menu-item
          ><el-menu-item index="3">
            <span slot="title">test</span> </el-menu-item
          ><el-menu-item index="3">
            <span slot="title">test</span> </el-menu-item
          ><el-menu-item index="3">
            <span slot="title">test</span> </el-menu-item
          ><el-menu-item index="3">
            <span slot="title">test</span> </el-menu-item
          ><el-menu-item index="3">
            <span slot="title">test</span> </el-menu-item
          ><el-menu-item index="3">
            <span slot="title">test</span> </el-menu-item
          ><el-menu-item index="3">
            <span slot="title">test</span> </el-menu-item
          ><el-menu-item index="3">
            <span slot="title">test</span> </el-menu-item
          ><el-menu-item index="3">
            <span slot="title">test</span> </el-menu-item
          ><el-menu-item index="3">
            <span slot="title">test</span> </el-menu-item
          ><el-menu-item index="3">
            <span slot="title">test</span> </el-menu-item
          ><el-menu-item index="3">
            <span slot="title">test</span> </el-menu-item
          ><el-menu-item index="3">
            <span slot="title">test</span> </el-menu-item
          ><el-menu-item index="3">
            <span slot="title">test</span> </el-menu-item
          ><el-menu-item index="3">
            <span slot="title">test</span> </el-menu-item
          ><el-menu-item index="3">
            <span slot="title">test</span> </el-menu-item
          ><el-menu-item index="3">
            <span slot="title">test</span> </el-menu-item
          ><el-menu-item index="3">
            <span slot="title">test</span> </el-menu-item
          ><el-menu-item index="3">
            <span slot="title">test</span> </el-menu-item
          ><el-menu-item index="3">
            <span slot="title">test</span> </el-menu-item
          ><el-menu-item index="3">
            <span slot="title">test</span>
          </el-menu-item>
          <el-menu-item index="2" @click="$router.push({ path: '/test' })">
            <span slot="title">test1</span>
          </el-menu-item>
        </el-menu>
      </perfect-scrollbar>
    </div>
  </div>
</template>
<script>
export default {
  data() {
    return {};
  },
  methods: {
    onScroll(event) {
      console.log(this.$refs.scrollbar.ps, event);
    },
  },
  watch: {
    //路由改变时，滚动条回到顶部
    $route() {
      this.$refs.scrollbar.$el.scrollTop = 0;
    },
  },
};
</script>
 
 
<style lang='scss' scoped>
.aside {
  height: 100vh;
  .aside-header {
    height: 60px;
    background-color: #545c64;
    line-height: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
  }
  .aside-menu {
    height: calc(100vh - 60px);
    background-color: #0b6dd0;
    //展开时宽度
    .el-menu-vertical-demo:not(.el-menu--collapse) {
      width: 256px;
    }
    .el-menu {
      height: 100%;
      border: 0 !important; //垂直时，去除右侧白边
    }
    //perfect-scrollbar默认的类名。自定义滚动条内容区域高度
    .ps {
      height: 100%;
    }
  }
}
</style>