ant-design-vue/components/menu/demo/inline.md

#### 内嵌菜单 垂直菜单，子菜单内嵌在菜单区域。 #### Inline menu Vertical menu with inline submenus.

<template>
  <div>
    <a-menu
      @click="handleClick"
      style="width: 256px"
      :defaultSelectedKeys="['1']"
      :openKeys.sync="openKeys"
      mode="inline"
    >
      <a-sub-menu key="sub1" @titleClick="titleClick">
        <span slot="title"><a-icon type="mail" /><span>Navigation One</span></span>
        <a-menu-item-group key="g1">
          <template slot="title"
            ><a-icon type="qq" /><span>Item 1</span></template
          >
          <a-menu-item key="1">Option 1</a-menu-item>
          <a-menu-item key="2">Option 2</a-menu-item>
        </a-menu-item-group>
        <a-menu-item-group key="g2" title="Item 2">
          <a-menu-item key="3">Option 3</a-menu-item>
          <a-menu-item key="4">Option 4</a-menu-item>
        </a-menu-item-group>
      </a-sub-menu>
      <a-sub-menu key="sub2" @titleClick="titleClick">
        <span slot="title"><a-icon type="appstore" /><span>Navigation Two</span></span>
        <a-menu-item key="5">Option 5</a-menu-item>
        <a-menu-item key="6">Option 6</a-menu-item>
        <a-sub-menu key="sub3" title="Submenu">
          <a-menu-item key="7">Option 7</a-menu-item>
          <a-menu-item key="8">Option 8</a-menu-item>
        </a-sub-menu>
      </a-sub-menu>
      <a-sub-menu key="sub4">
        <span slot="title"><a-icon type="setting" /><span>Navigation Three</span></span>
        <a-menu-item key="9">Option 9</a-menu-item>
        <a-menu-item key="10">Option 10</a-menu-item>
        <a-menu-item key="11">Option 11</a-menu-item>
        <a-menu-item key="12">Option 12</a-menu-item>
      </a-sub-menu>
    </a-menu>
  </div>
</template>
<script>
  export default {
    data() {
      return {
        current: ['mail'],
        openKeys: ['sub1'],
      };
    },
    methods: {
      handleClick(e) {
        console.log('click', e);
      },
      titleClick(e) {
        console.log('titleClick', e);
      },
    },
    watch: {
      openKeys(val) {
        console.log('openKeys', val);
      },
    },
  };
</script>