vue中的菜单组件

在components中分别创建4个组件

Menu、  MenuItem、 ReSubMenu、 SubMenu

// Menu.vue代码
<template>
  <ul>
    <slot></slot>
  </ul>
</template>

<script>
  export default {
    name: "Menu"
  }
</script>

// MenuItem.vue
<template>
  <li>
    <slot></slot>
  </li>
</template>

<script>
  export default {
    name: "MenuItem"
  }
</script>

// ReSubMenu.vue
<template>
  <SubMenu>
    <template #title>
      {{data.title}}
    </template>

    <template v-for="child in data.children">
      <MenuItem :key="child.title" v-if="!child.children">
        {{child.title}}
      </MenuItem>

      <ReSubMenu :key="child.title" v-else :data="child"></ReSubMenu>
    </template>
  </SubMenu>
</template>

<script>
  import SubMenu from "./SubMenu"
  import MenuItem from "./MenuItem"
  export default {
    name: "ReSubMenu",
    props: {
      data: {
        type: Array,
        default: ()=>({})
      }
    },
    components: {
      SubMenu,
      MenuItem,
    }
  }
</script>

// SubMenu.vue
<template>
  <div>
    <div @click="click" >
      <slot name="title"></slot>
    </div>

    <div v-show="flag" class="sub">
      <slot></slot>
    </div>
  </div>
</template>

<script>
  export default {
    name: "SubMenu",
    data(){
      return {
        flag: false
      }
    },
    methods: {
      click(){
        this.flag = !this.flag
      }
    }
  }
</script>

<style scoped>
.sub{
  padding-left: 20px;
}
</style>

 

// App.vue
<template>
  <div id="app">
    <Menu>
      <template v-for="menu in menuList">
        <MenuItem :key="menu.title" v-if="!menu.children">{{menu.title}}</MenuItem>
        <!--   把重复的部分 先抽离出去     -->
        <ReSubMenu :key="menu.title" :data="menu" v-else></ReSubMenu>
      </template>
    </Menu>
  </div>
</template>

<script>
  import Menu from './components/Menu'
  import MenuItem from './components/MenuItem'
  import ReSubMenu from "./components/ReSubMenu"

  export default {
    name: 'App',
    data(){
      return {
        menuList: [
          {
            title: '菜单1',
            children: [
              {
                title: '菜单1-1',
                children: [
                  {
                    title: '菜单1-1-1',
                    children: [
                      {title: '菜单1-1-1-1'},
                      {title: '菜单1-1-1-2'},
                      {title: '菜单1-1-1-3'},
                    ]
                  },
                  {
                    title: '菜单1-1-2'
                  },
                  {
                    title: '菜单1-1-3'
                  }

                ]
              },
              {title: '菜单1-2'},
              {title: '菜单1-3'},
            ]
          },
          {
            title: '菜单2'
          },
          {
            title: '菜单3'
          }
        ]
      }
    },
    components: {
      Menu,
      MenuItem,
      ReSubMenu,
    }
  }
</script>

<style>
  #app {
    color: red;
  }
</style>