vue element 生成无线级左侧菜单的实现代码

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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

5 <!--
 * @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