vue生成element左侧菜单

首先来总结element ui 官方文档的左侧菜单结构,带有el-submenu为子级节点,el-menu-item表示没有下级。当然,菜单不能写死，因为菜单也许不止两级,所以我们需要递归来实现。根据当前节点是否有下级去判断,如果有下级,则继续调用子级,直到没有下级为止,下面我贴上左侧菜单所有的代码:

• 请求数据格式

 [
       {
         name: "首页",
         id: -1,
         icon: "el-icon-picture-outline-round",
         url: "/index",
         children: []
       },
       {
         name: "按钮",
         id: 20,
         icon: "el-icon-message-solid",
         url: "/button",
         children: []
       },
       {
         name: "测试1",
         id: 1,
         icon: "el-icon-s-claim",
         url: "",
         children: [
           {
             id: 4,
             parentid: 1,
             name: "测试1-1",
             icon: "el-icon-chat-dot-round",
             url: "",
             children: [
               {
                 id: 8,
                 parentid: 1,
                 name: "测试1-1-1",
                 icon: "el-icon-cloudy",
                 url: "/test",
                 children: []
               },
               {
                 id: 9,
                 parentid: 1,
                 name: "测试1-1-2",
                 icon: "el-icon-files",
                 url: "/test1",
                 children: []
               }
             ]
           },
           {
             id: 5,
             parentid: 1,
             name: "测试1-2",
             icon: "el-icon-shopping-cart-1",
             url: "/test3",
             children: []
           }
         ]
       },
       {
         name: "测试2",
         id: 2,
         icon: "el-icon-menu",
         url: "",
         children: [
           {
             id: 6,
             parentid: 2,
             name: "测试2-1",
             icon: "el-icon-folder-checked",
             url: "",
             children: []
           },
           {
             id: 7,
             parentid: 2,
             name: "测试2-2",
             icon: "el-icon-folder-remove",
             url: "",
             children: []
           }
         ]
       },
       {
         name: "测试3",
         id: 3,
         icon: "el-icon-monitor",
         url: "",
         children: []
       }
     ]

• menu.vue

 <template>
   <div class="menu">
     <div class="logo-con">
       <div class="title" v-show="!collapse">
         <span class="title__sider-title is-active">{{logo}}</span>
       </div>
       <div class="title" v-show="collapse">
         <span class="title__sider-title el-tag--mini">LG</span>
       </div>
     </div>
     <el-menu
       :background-color="backgroundColor"
       :text-color="textColor"
       :default-active="$route.meta.pageId"
       :collapse="collapse"
     >
       <template v-for="item in list">
         <router-link :to="item.url" :key="item.id" v-if="item.children.length===0">
           <el-menu-item :index="item.id.toString()">
             <i :class="item.icon"></i>
             <span slot="title">{{item.name}}</span>
           </el-menu-item>
         </router-link>
         <subMenu v-else :data="item" :key="item.id"></subMenu>
       </template>
     </el-menu>
   </div>
 </template>
 
 <script>
 import subMenu from "./subMenu";
 export default {
   name: "menuList",
   components: {
     subMenu
   },
   data() {
     return {
       collapse: false, //是否折叠
       list: [], //当行菜单数据源
       backgroundColor: "#304156", //导航菜单背景颜色
       textColor: "#BFCBD9", //导航菜单文字颜色
       logo: "LOGO" //logo
     };
   }
 };
 </script>
 
 <style lang="scss" scoped>
 .el-menu {
   border-right: none;
   a {
     text-decoration: none;
   }
 }
 .logo-con {
   height: 64px;
   padding: 10px;
 
   .title {
     position: relative;
     text-align: center;
     font-size: 20px;
     height: 64px;
     line-height: 64px;
 
     span {
       padding: 0 5px 0 0;
       color: #409eff;
       font-size: 20px;
     }
   }
 }
 </style>

• submenu.vue

　　 这里有个知识点functional,不懂自行百度,文档地址:https://cn.vuejs.org/v2/guide/render-function.html#search-query-sidebar

 
  <!--
  * @Description:
  * @Author: PengYH
  * @Date: 2019-08-06
  -->
 <template functional>
   <el-submenu :index="props.data.id.toString()">
     <template slot="title">
       <i :class="props.data.icon"></i>
       <span>{{props.data.name}}</span>
     </template>
     <template v-for="item in props.data.children">
       <router-link :to="item.url" :key="item.id" v-if="item.children.length===0">
         <el-menu-item class="subitem" :index="item.id.toString()">
           <i :class="item.icon"></i>
           <span slot="title">{{item.name}}</span>
         </el-menu-item>
       </router-link>
       <sub-menu v-else :data="item" :key="item.id"></sub-menu>
     </template>
   </el-submenu>
 </template>
 
 <script>
 export default {
   name: "submenu",
   props: {
     data: [Array, Object]
   }
 };
 </script>
 
 <style lang="scss" scoped>
 .el-submenu {
   .el-menu-item {
     padding: 0;
   }
 }
 </style>

• 效果图