Basic

<div style="width:500px">
  <n-menu :title="'Test'" 
    v-model="selected" 
    :defaultOpenNames="initOpenKeys"
    :openNames="opens" 
    @openNamesChange="changeOpen"
    @select="changeSelect"

    >
    <template v-slot:drawer-header-icon>
      <div style="overflow:hidden">1111</div>
    </template>
    <n-menu-item title="num1" name="num1"></n-menu-item>
    <n-menu-item title="num2" name="num2"></n-menu-item>
    <n-menu-item title="num3" name="num3"></n-menu-item>
    <n-sub-menu title="subMenu" name="subMenu" disabled>
      <n-menu-item title="sub1" name="sub1"></n-menu-item>
    </n-sub-menu>
    <n-sub-menu title="subMenu2" name="subMenu2">
      <n-sub-menu title="subMenu22" name="subMenu22">
        <n-menu-item title="sub222" name="sub222" disabled></n-menu-item>
      </n-sub-menu>
    </n-sub-menu>
    <n-sub-menu title="subMenu3" name="subMenu3">
      <n-item-group title="group">
        <n-menu-item title="sub1" name="sub6"></n-menu-item>
        <n-menu-item title="sub1" name="sub7"></n-menu-item>
      </n-item-group>
    </n-sub-menu>
  </n-menu>
</div>

export default {
  data () {
    return {
      selected: 'sub1',
      initOpenKeys: ['subMenu', "subMenu2","subMenu22"],
      opens: ['subMenu']
    }
  },
  methods: {
    changeOpen (names) {
      console.log('names', names)
    },
    changeSelect (val) {
      console.log('changeSelect', val)
    }
  }
};

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Basic

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