首先來總結element ui 官方文檔的左側菜單結構,帶有el-submenu為子級節點,el-menu-item表示沒有下級。當然,菜單不能寫死，因為菜單也許不止兩級,所以我們需要遞歸來實現。根據當前節點是否有下級去判斷,如果有下級,則繼續調用子級,直到沒有下級為止,下面我貼上左側菜單所有的代碼:

請求數據格式

[   {    name: "首頁",    id: -1,    icon: "el-icon-picture-outline-round",    url: "/index",    children: []   },   {    name: "按鈕",    id: 20,    icon: "el-icon-message-solid",    url: "/button",    children: []   },   {    name: "測試1",    id: 1,    icon: "el-icon-s-claim",    url: "",    children: [     {      id: 4,      parentid: 1,      name: "測試1-1",      icon: "el-icon-chat-dot-round",      url: "",      children: [       {        id: 8,        parentid: 1,        name: "測試1-1-1",        icon: "el-icon-cloudy",        url: "/test",        children: []       },       {        id: 9,        parentid: 1,        name: "測試1-1-2",        icon: "el-icon-files",        url: "/test1",        children: []       }      ]     },     {      id: 5,      parentid: 1,      name: "測試1-2",      icon: "el-icon-shopping-cart-1",      url: "/test3",      children: []     }    ]   },   {    name: "測試2",    id: 2,    icon: "el-icon-menu",    url: "",    children: [     {      id: 6,      parentid: 2,      name: "測試2-1",      icon: "el-icon-folder-checked",      url: "",      children: []     },     {      id: 7,      parentid: 2,      name: "測試2-2",      icon: "el-icon-folder-remove",      url: "",      children: []     }    ]   },   {    name: "測試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, //是否折疊   list: [], //當行菜單數據源   backgroundColor: "#304156", //導航菜單背景顏色   textColor: "#BFCBD9", //導航菜單文字顏色   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>