element-plus/docs/examples/dropdown/command-event.vue

<template>
  <el-dropdown @command="handleCommand">
    <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 command="a">Action 1</el-dropdown-item>
        <el-dropdown-item command="b">Action 2</el-dropdown-item>
        <el-dropdown-item command="c">Action 3</el-dropdown-item>
        <el-dropdown-item command="d" disabled>Action 4</el-dropdown-item>
        <el-dropdown-item command="e" divided>Action 5</el-dropdown-item>
      </el-dropdown-menu>
    </template>
  </el-dropdown>
</template>

<script lang="ts">
import { defineComponent } from 'vue'
import { ElMessage } from 'element-plus'
import { ArrowDown } from '@element-plus/icons'

export default defineComponent({
  components: {
    ArrowDown,
  },
  setup() {
    const handleCommand = (command) => {
      ElMessage(`click on item ${command}`)
    }
    return {
      handleCommand,
    }
  },
})
</script>