<el-menu background-color="#333744" text-color="#fff" active-text-color="#409EFF" :unique-opened="true"
                :collapse="isCollapse" :collapse-transition="false" router :default-active="activePath">
                <!-- 一級選單 -->
                <el-submenu :index="item.id+ ''" v-for="item in menulist" :key="item.id">
                    <!-- 一級選單模板區域 -->
                    <template slot="title">
                        <!-- 圖示 -->
                        <i :class="iconsObj[item.id]"></i>
                        <!-- 文字 -->
                        <span>{{item.authName}}</span>
                    </template>
                    <!--二級選單-->
                    <el-menu-item :index="'/'+subItem.path" v-for="subItem in item.children" :key="subItem.id" @click="saveNavState('/'+subItem.path)">
                        <!-- 二級選單模板區域 -->
                        <template slot="title">
                        <!-- 圖示 -->
                        <i class="el-icon-menu"></i>
                        <!-- 文字 -->
                        <span>{{subItem.authName}}</span>
                        </template>
                    </el-menu-item>
                </el-submenu>
                </el-menu>

　　<template slot>作用域插槽,是對元件的擴充套件，通過slot插槽向元件內部指定位置傳遞內容，通過slot可以父子傳參；

　　二級選單：el-menu-item :index="'/'+subItem.path" :index指定預設路由為'/'+subItem.path"

<template>
    <el-container class="home-container">
        <!-- 頭部區域 -->
        <el-header>
            <div>
                <img src="../assets/heima.png" alt="">
                <span>電商後臺管理系統</span>
            </div>
            <el-button type="info" @click="logout">退出</el-button>
        </el-header>
        <!-- 頁面主體區域 -->
        <el-container>
            <!-- 側邊欄 -->
            <el-aside :width="isCollapse ? '64px':'200px'">
                <!-- 摺疊展開 -->
                <div class="toggle-button" @click="toggleCollapse">|||</div>
                <!-- 側邊欄選單區域 -->
                <el-menu background-color="#333744" text-color="#fff" active-text-color="#409EFF" :unique-opened="true"
                :collapse="isCollapse" :collapse-transition="false" router :default-active="activePath">
                <!-- 一級選單 -->
                <el-submenu :index="item.id+ ''" v-for="item in menulist" :key="item.id">
                    <!-- 一級選單模板區域 -->
                    <template slot="title">
                        <!-- 圖示 -->
                        <i :class="iconsObj[item.id]"></i>
                        <!-- 文字 -->
                        <span>{{item.authName}}</span>
                    </template>
                    <!--二級選單-->
                    <el-menu-item :index="'/'+subItem.path" v-for="subItem in item.children" :key="subItem.id" @click="saveNavState('/'+subItem.path)">
                        <!-- 二級選單模板區域 -->
                        <template slot="title">
                        <!-- 圖示 -->
                        <i class="el-icon-menu"></i>
                        <!-- 文字 -->
                        <span>{{subItem.authName}}</span>
                        </template>
                    </el-menu-item>
                </el-submenu>
                </el-menu>
            </el-aside>
            <!-- 內容-->
            <el-main>
                <!-- 路由佔位符 -->
                <router-view></router-view>
            </el-main>
        </el-container>
    </el-container>
</template>
<script>
export default {
    data() {
        return {
            menulist: [],
            iconsObj: {
                '125': 'iconfont icon-user',
                '103': 'iconfont icon-tijikongjian',
                '101': 'iconfont icon-shangpin',
                '102': 'iconfont icon-danju',
                '145': 'iconfont icon-baobiao'
            },
            isCollapse: false, //是否摺疊

            activePath: '' //被啟用的連結地址
        }
    },
    created() {
        this.getMenuList()
        this.activePath = window.sessionStorage.getItem('activePath')
    },
    methods: {
        logout(){
            window.sessionStorage.clear()
            this.$router.push('/login')
        },
            // 獲取所有的選單
        async getMenuList() {
            const {data: res} = await this.$http.get('menus')
            // console.log(res)
            if (res.meta.status != 200) return this.$message.error(res.meta.msg)
            this.menulist = res.data
        },
        // 點選切換選單摺疊與展開
        toggleCollapse(){
            this.isCollapse = !this.isCollapse
        },
        // 儲存連結的啟用狀態
        saveNavState(activePath){
            window.sessionStorage.setItem('activePath',activePath) // 記憶到session, 重新整理後不忘記
            this.activePath = activePath
        }
    }
}

</script>
<style lang="less" scoped>
.home-container{
    height: 100%;
}
.el-header{
    background-color: #373D41;
    display: flex;
    justify-content: space-between;
    padding-left: 0;
    align-items: center;
    color: #fff;
    font-size: 20px;
    div{
        display: flex;
        align-items: center;
        span{
            margin-left: 15px;
        }
    }
}
.el-aside{
    background-color: #333744;
    .el-menu{
        border-right: none;
    }
    
}
.el-main{
    background-color: #EAEDF1;
}
.iconfont{
    margin-right: 10px;
}
.toggle-button{
    background-color: #4A5064;
    font-size: 10px;
    line-height: 24px;
    color: #fff;
    text-align: center;
    letter-spacing: 0.2em;
    cursor: pointer;
}
</style>