<cn>
#### 垂直菜单
子菜单是弹出的形式。
</cn>

<us>
#### Vertical menu
Submenus open as pop-ups.
</us>

```html
<template>
<div>
  <a-menu
    style="width: 256px"
    mode="vertical"
    @click="handleClick"
  >
    <a-menu-item key="1">
      <a-icon type="mail" />
      Navigation One
    </a-menu-item>
    <a-menu-item key="2">
      <a-icon type="calendar" />
      Navigation Two
    </a-menu-item>
    <a-sub-menu key="sub1">
      <span slot="title"><a-icon type="appstore" /><span>Navigation Three</span></span>
      <a-menu-item key="3">Option 3</a-menu-item>
      <a-menu-item key="4">Option 4</a-menu-item>
      <a-sub-menu key="sub1-2" title="Submenu">
        <a-menu-item key="5">Option 5</a-menu-item>
        <a-menu-item key="6">Option 6</a-menu-item>
      </a-sub-menu>
    </a-sub-menu>
    <a-sub-menu key="sub2">
      <span slot="title"><a-icon type="setting" /><span>Navigation Four</span></span>
      <a-menu-item key="7">Option 7</a-menu-item>
      <a-menu-item key="8">Option 8</a-menu-item>
      <a-menu-item key="9">Option 9</a-menu-item>
      <a-menu-item key="10">Option 10</a-menu-item>
    </a-sub-menu>
  </a-menu>
</div>
</template>
<script>
export default {
  methods: {
    handleClick (e) {
      console.log('click ', e)
    },
  },
}

</script>
```