Element-UI Plus 给el-dropdown添加滚动条效果

不需要添加el-scrollbar的使用方法!!!

复制一个原生的dropdown组件
https://element-plus.gitee.io/zh-CN/component/dropdown.html#基础用法

<template>
  <el-dropdown>
    <span class="el-dropdown-link">
      Dropdown List
      <el-icon class="el-icon--right">
        <arrow-down />
      </el-icon>
    </span>
    <template #dropdown>
      <el-dropdown-menu>
        <el-dropdown-item>Action 1</el-dropdown-item>
        <el-dropdown-item>Action 2</el-dropdown-item>
        <el-dropdown-item>Action 3</el-dropdown-item>
        <el-dropdown-item disabled>Action 4</el-dropdown-item>
        <el-dropdown-item divided>Action 5</el-dropdown-item>
      </el-dropdown-menu>
    </template>
  </el-dropdown>
</template>
<script lang="ts" setup>
import { ArrowDown } from '@element-plus/icons-vue'
</script>
<style scoped>
.example-showcase .el-dropdown-link {
  cursor: pointer;
  color: var(--el-color-primary);
  display: flex;
  align-items: center;
}
</style>

只需要给el-dropdown-menu 添加css

.el-dropdown-menu {
    overflow: scroll; // 添加滚动条
    max-height: 200px; // 最大高度
    overflow-x: hidden; // 隐藏x轴上的滚动条
}