element 实现导航栏收起展开功能及思路

 <el-menu :collapse="isCollapse" class="el-menu-vertical"></el-menu>

  <!-- width的宽度跟collapse一样动态控制 -->
  <el-aside width="collapse"></el-aside>

   <el-header>
          <!-- 点击展开收起导航和切换对应图标 -->
          <i class="el-icon-s-fold" @click="isC" v-show="block"></i>
          <i class="el-icon-s-unfold" @click="isC" v-show="toggle"></i>
   </el-header>

export default {
  name: "Main",
  data() {
    return {
      isCollapse: false, //导航栏默认为展开
      toggle: false,//第二个图标默认隐藏
      block: true,//默认显示第一个图标
    };
  },
};

  methods: {
    // 动态控制展开与收起和切换对应图标
    isC() {
      this.isCollapse = !this.isCollapse;
      this.toggle = !this.toggle;
      this.block = !this.block;
    },
  },

.el-menu-vertical:not(.el-menu--collapse) {
  width: 240px;
}

<template>
  <div>
    <el-container>
      <!-- width的宽度跟collapse一样动态控制 -->
      <el-aside width="collapse">
        <!-- :collapse="isCollapse"  class="el-menu-vertical" 动态控制导航菜单的收起与展开  router：让index作为 path 进行路由跳转 -->
        <el-menu :default-active="$route.path" router :collapse="isCollapse" class="el-menu-vertical" background-color="#393e42"
          text-color="#fff" active-text-color="rgb(64, 158, 255)">
          <el-submenu index="1">
            <!-- 插槽 插入一级导航标题 -->
            <template slot="title">
              <i class="el-icon-s-tools"></i>
              <span>工厂设置</span>
            </template>
            <!-- 二级导航标题 -->
            <el-menu-item-group>
              <el-menu-item index="/A-Business/A-Business">
                <i class="el-icon-s-shop"></i>商户信息
              </el-menu-item>
            </el-menu-item-group>
          </el-submenu>
        </el-menu>
      </el-aside>
      <el-container>
        <el-header>
          <div class="box_bgd" @click="isC">
            <!-- 点击展开收起导航和切换对应图标 -->
            <i class="el-icon-s-fold" v-show="block"></i>
            <i class="el-icon-s-unfold" v-show="toggle"></i>
          </div>
        </el-header>
        <el-main>
          <router-view></router-view>
        </el-main>
      </el-container>
    </el-container>
  </div>
</template>

<script>
export default {
  data() {
    return {
      isCollapse: false, //导航栏默认为展开
      toggle: false, //第二个图标默认隐藏
      block: true, //默认显示第一个图标
    };
  },
  methods: {
    // 动态控制展开与收起和切换对应图标
    isC() {
      this.isCollapse = !this.isCollapse;
      this.toggle = !this.toggle;
      this.block = !this.block;
    },
  },
};
</script>

<style scoped>
.el-header {
  background-color: #b3c0d1;
  color: #333;
  line-height: 60px;
  height: 100%;
  padding: 0 !important;
}

.el-aside {
  background-color: #393e42;
  color: #333;
  height: 100vh;
}
.el-menu {
  border-right-width: 0;
}
.el-main {
  color: #333;
}
.el-menu-vertical:not(.el-menu--collapse) {
  width: 240px;
}
.box_bgd {
  height: 60px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  width: 54px;
}
.box_bgd i {
  font-size: 20px;
}
.box_bgd:hover {
  background-color: rgb(203, 215, 230);
}
</style>

<doc>
  容器页面
</doc>
<template>
  <div class="main">
    <div class="layout-top"></div>
    <div class="layout-bottom">
      <!-- 左侧 -->
      <div id="LayoutLeft" class="layout-left">
      <el-menu default-active="1" class="el-menu-vertical" :collapse="isCollapse">
        <el-submenu index="1">
          <template slot="title">
            <i class="el-icon-location"></i>
            <span slot="title">导航一</span>
          </template>
          <el-menu-item-group>
            <span slot="title">分组一</span>
            <el-menu-item index="1-1">选项1</el-menu-item>
            <el-menu-item index="1-2">选项2</el-menu-item>
          </el-menu-item-group>
          <el-menu-item-group title="分组2">
            <el-menu-item index="1-3">选项3</el-menu-item>
          </el-menu-item-group>
          <el-submenu index="1-4">
            <span slot="title">选项4</span>
            <el-menu-item index="1-4-1">选项1</el-menu-item>
          </el-submenu>
        </el-submenu>
        <el-menu-item index="2">
          <i class="el-icon-menu"></i>
          <span slot="title">导航二</span>
        </el-menu-item>
      </el-menu>
        <!-- 控制菜单的收缩 -->
        <div @click="shrinkMenu" class="shrink">
          <i :class="isCollapse ? 'el-icon-s-unfold': 'el-icon-s-fold'"></i>
        </div>
      </div>
      <!-- 右侧 -->
      <div id="LayoutRight" class="layout-right">
        <div class="layout-content">
          <router-view></router-view>
        </div>
      </div>
    </div>
  </div>
</template>
<script>
export default {
  computed: {
    isCollapse: {
      get() {
        return this.$store.state.common.isCollapse
      },
      set(val) {
        this.$store.commit('common/updateisCollapse', val)
      }
    }
  },
  methods: {
    shrinkMenu() {
      this.isCollapse = !this.isCollapse;
    }
  }
}
</script>
<style>
.main {
  width: 100vw;
  height: 100vh;
}
/* --- 上面部分 --- */
.layout-top {
  width: 100%;
  height: 60px;
  background: #b3c0d1;
}
 
/* ------ 下面部分 ------ */
.layout-bottom {
  width: 100%;
  height: calc(100% - 60px);
  /* flex布局 */
  display: flex;
}
.layout-left {
  /* 左侧不设置宽度 */
  width: auto;
  height: 100%;
  background: #d3dce6;
  position: relative;
}
.layout-right {
  height: 100%;
  /* flex关键代码，让右侧占满剩余宽度 */
  flex: 1;
  background: #e9eef3;
  padding: 25px;
  box-sizing: border-box;
}
/* 将来所有的业务页面容器 */
.layout-content {
  width: 100%;
  height: 100%;
  background: #fff;
}
 
/* el-menu相关样式 */
.el-menu {
  height: 100%;
  border-right-width: 0;
}
/* 必须设置 */
.el-menu-vertical:not(.el-menu--collapse) {
  width: 200px;
}
 
/* 控制菜单收缩 */
.shrink {
  position: absolute;
  top: 50%;
  right: -25px;
  transform: translateY(-50%);
  width: 25px;
  height: 30px;
  border: 1px solid #b3c0d1;
  background: #b3c0d1;
  display: flex;
  justify-content: center;
  align-items: center;
  border-radius: 3px;
  cursor: pointer;
  z-index: 9999;
}
</style>

.el-menu-vertical:not(.el-menu--collapse) {
  width: 200px;
}