diff --git a/src/components/ToolbarMenuButton.test.ts b/src/components/ToolbarMenuButton.test.ts
new file mode 100644
index 0000000..727bdd9
--- /dev/null
+++ b/src/components/ToolbarMenuButton.test.ts
@@ -0,0 +1,72 @@
+import { mount } from '@vue/test-utils'
+import { describe, expect, it } from 'vitest'
+import ToolbarMenuButton from './ToolbarMenuButton.vue'
+
+function mountMenu(props: { label: string; toggleTestid: string; disabled?: boolean }) {
+  return mount(ToolbarMenuButton, {
+    props,
+    attachTo: document.body,
+    slots: {
+      default: `<template #default="{ close }">
+        <li role="menuitem"><button data-testid="item-a" @click="close">Item A</button></li>
+        <li role="menuitem"><button data-testid="item-b" @click="close">Item B</button></li>
+      </template>`,
+    },
+  })
+}
+
+describe('ToolbarMenuButton', () => {
+  it('renders the toggle button with the given label and closed menu by default', () => {
+    const wrapper = mountMenu({ label: '导出 ▾', toggleTestid: 'export-menu-toggle' })
+    expect(wrapper.get('button[data-testid="export-menu-toggle"]').text()).toBe('导出 ▾')
+    expect(wrapper.find('[data-testid="item-a"]').exists()).toBe(false)
+    wrapper.unmount()
+  })
+
+  it('opens the menu when the toggle button is clicked', async () => {
+    const wrapper = mountMenu({ label: '导出 ▾', toggleTestid: 'export-menu-toggle' })
+    await wrapper.get('button[data-testid="export-menu-toggle"]').trigger('click')
+    expect(wrapper.get('[data-testid="item-a"]').isVisible()).toBe(true)
+    expect(wrapper.get('[data-testid="item-b"]').isVisible()).toBe(true)
+    wrapper.unmount()
+  })
+
+  it('closes the menu when a slot item calls close', async () => {
+    const wrapper = mountMenu({ label: '导出 ▾', toggleTestid: 'export-menu-toggle' })
+    await wrapper.get('button[data-testid="export-menu-toggle"]').trigger('click')
+    await wrapper.get('button[data-testid="item-a"]').trigger('click')
+    expect(wrapper.find('[data-testid="item-a"]').exists()).toBe(false)
+    wrapper.unmount()
+  })
+
+  it('closes the menu when clicking outside the component', async () => {
+    const wrapper = mountMenu({ label: '导出 ▾', toggleTestid: 'export-menu-toggle' })
+    await wrapper.get('button[data-testid="export-menu-toggle"]').trigger('click')
+    expect(wrapper.find('[data-testid="item-a"]').exists()).toBe(true)
+
+    document.body.click()
+    await wrapper.vm.$nextTick()
+
+    expect(wrapper.find('[data-testid="item-a"]').exists()).toBe(false)
+    wrapper.unmount()
+  })
+
+  it('closes the menu when Escape is pressed', async () => {
+    const wrapper = mountMenu({ label: '导出 ▾', toggleTestid: 'export-menu-toggle' })
+    await wrapper.get('button[data-testid="export-menu-toggle"]').trigger('click')
+    expect(wrapper.find('[data-testid="item-a"]').exists()).toBe(true)
+
+    await wrapper.get('div.toolbar-menu').trigger('keydown', { key: 'Escape' })
+
+    expect(wrapper.find('[data-testid="item-a"]').exists()).toBe(false)
+    wrapper.unmount()
+  })
+
+  it('disables the toggle button and never opens the menu when disabled is true', async () => {
+    const wrapper = mountMenu({ label: '导出 ▾', toggleTestid: 'export-menu-toggle', disabled: true })
+    expect(wrapper.get('button[data-testid="export-menu-toggle"]').attributes('disabled')).toBeDefined()
+    await wrapper.get('button[data-testid="export-menu-toggle"]').trigger('click')
+    expect(wrapper.find('[data-testid="item-a"]').exists()).toBe(false)
+    wrapper.unmount()
+  })
+})
diff --git a/src/components/ToolbarMenuButton.vue b/src/components/ToolbarMenuButton.vue
new file mode 100644
index 0000000..3a300bb
--- /dev/null
+++ b/src/components/ToolbarMenuButton.vue
@@ -0,0 +1,58 @@
+<script setup lang="ts">
+import { onMounted, onUnmounted, ref } from 'vue'
+
+defineProps<{
+  label: string
+  toggleTestid: string
+  disabled?: boolean
+}>()
+
+const open = ref(false)
+const rootRef = ref<HTMLElement | null>(null)
+
+function toggle(): void {
+  open.value = !open.value
+}
+
+function close(): void {
+  open.value = false
+}
+
+function handleDocumentClick(event: MouseEvent): void {
+  if (!rootRef.value) return
+  if (!rootRef.value.contains(event.target as Node)) {
+    close()
+  }
+}
+
+function handleKeydown(event: KeyboardEvent): void {
+  if (event.key === 'Escape') {
+    close()
+  }
+}
+
+onMounted(() => {
+  document.addEventListener('click', handleDocumentClick)
+})
+
+onUnmounted(() => {
+  document.removeEventListener('click', handleDocumentClick)
+})
+</script>
+
+<template>
+  <div ref="rootRef" class="toolbar-menu" @keydown="handleKeydown">
+    <button
+      type="button"
+      :data-testid="toggleTestid"
+      :disabled="disabled"
+      :aria-expanded="open"
+      @click.stop="toggle"
+    >
+      {{ label }}
+    </button>
+    <ul v-if="open" class="toolbar-menu-list" role="menu">
+      <slot :close="close" />
+    </ul>
+  </div>
+</template>