element的menu折叠隐藏效果

<template>
 <div class="main">
  <div class="left_main" :class="{ left_main_show: openStatus }">
   <el-menu
    id="elmenu"
    background-color="#545c64"
    text-color="#fff"
    active-text-color="#ffd04b"
    class="el-menu-vertical-demo"
    :collapse="openStatus"
   >
    <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-item index="3" disabled>
     <i class="el-icon-document"></i>
     <span slot="title">导航三</span>
    </el-menu-item>
    <el-menu-item index="4">
     <i class="el-icon-setting"></i>
     <span slot="title">导航四</span>
    </el-menu-item>
   </el-menu>
  </div>
  <div class="right_main">
   <div class="open_close">
    <i @click="change" v-if="open_close" class="el-icon-s-fold"></i>
    <i @click="change" v-else class="el-icon-s-unfold"></i>
   </div>
  </div>
 </div>
</template>
<script>
export default {
 name: 'Always',
 data() {
  return {
   openStatus: false,
   open_close: true,
  }
 },
 methods: {
  change() {
   this.openStatus = !this.openStatus
   if (this.openStatus) {
    setTimeout(() => {
     this.open_close = false
    }, 1000)
   } else {
    setTimeout(() => {
     this.open_close = true
    }, 1000)
   }
  },
 },
}
</script>
<style lang="scss" scoped>
.main {
 display: flex;
 width: 100%;
 height: 100vh;
 .left_main {
  width: 180px;
  text-align: center;
  transition: width 1s;
  background-color: #545c64;
  .el-menu {
   border: none;
   height: 100%;
   text-align: left;
  }
  //  关键，必须加上，否则在折叠时会出现第一个文字卡顿后消失
  .el-menu:not(.el-menu--collapse) {
   width: 100%;
  }
 }

 .right_main {
  flex: 1;
  background-color: brown;
  position: relative;
  .open_close {
   position: absolute;
   left: 0;
   top: 0;
   color: white;
   font-size: 24px;
  }
 }
 .left_main_show {
  width: 60px;
 }
}
</style>

 

 

 感觉上面的有些问题，可以用下面这个：

<template>
  <div class="layout1_box">
    <header>
      <el-radio-group v-model="isCollapse" style="margin-bottom: 20px;">
        <el-radio-button :label="false">展开</el-radio-button>
        <el-radio-button :label="true">收起</el-radio-button>
      </el-radio-group>
    </header>
    <main class="main">
      <div class="left" :style="{ width: isCollapse ? '60px' : '200px' }">
        <el-menu
          default-active="1-4-1"
          class="el-menu-vertical-demo"
          @open="handleOpen"
          @close="handleClose"
          :collapse="isCollapse"
        >
          <el-menu-item index="2">
            <i class="el-icon-menu"></i>
            <span slot="title">导航二</span>
          </el-menu-item>
          <el-menu-item index="3" disabled>
            <i class="el-icon-document"></i>
            <span slot="title">导航三</span>
          </el-menu-item>
          <el-menu-item index="4">
            <i class="el-icon-setting"></i>
            <span slot="title">导航四</span>
          </el-menu-item>
        </el-menu>
      </div>
      <div class="right"></div>
    </main>
  </div>
</template>

<style>
.el-menu-vertical-demo:not(.el-menu--collapse) {
  width: 200px;
  min-height: 400px;
}
.el-menu {
  border: none;
  height: 100%;
  text-align: center;
}
.layout1_box {
  height: 100%;
  width: 100%;
}
.main {
  display: flex;
  height: calc(100% - 60px);
  width: 100%;
}

.left {
  width: 200px;
  background: blue;
  transition: width 0.5s;
}
.right {
  flex: 1;
  background: pink;
  height: 100%;
}
</style>

<script>
export default {
  data() {
    return {
      isCollapse: false,
    };
  },
  methods: {
    handleOpen(key, keyPath) {
      console.log(key, keyPath);
    },
    handleClose(key, keyPath) {
      console.log(key, keyPath);
    },
  },
};
</script>