element NavMenu折叠功能,折叠后留了空白位置要怎么处理?

element NavMenu折叠功能,折叠后留了空白位置要怎么处理?

<template>
  <div class="index_page">
    <div class="index_top">
      <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>
    </div>
    <div class="index_menu">
      <el-menu
        default-active="2"
        class="el-menu-vertical-demo"
        background-color="#545c64"
        text-color="#fff"
        active-text-color="#ffd04b"
        :collapse="isCollapse"
        :unique-opened="true"
        :router="true"
      >
        <el-submenu index="1">
          <template slot="title">
            <i class="el-icon-location"></i>
            <span>导航一</span>
          </template>
          <el-menu-item-group>
            <template slot="title">分组一</template>
            <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">
            <template slot="title">选项4</template>
            <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="index_content">
      <router-view></router-view>
    </div>
  </div>
</template>

<script>
export default {
  methods: {
    checkMunuFn() {
      this.isCollapse = !this.isCollapse;
    },
  },
};
</script>

<style scoped lang="less">
  .el-menu-vertical-demo:not(.el-menu--collapse) {
    width: 200px;
    min-height: 800px;
  }
.index_page {
  position: relative;
  height: 100%;
  .index_top {
    height: 70px;
    background-color: gold;
  }
  .index_menu {
   position: absolute;
    width: 200px;
    top: 70px;
    left: 0;
    bottom: 0;
  }
  .index_content {
    position: absolute;
    top: 70px;
    left: 200px;
    right: 0;
    bottom: 0;
    background-color: pink;
  }
}
</style>

<template>
  <div class="index_page">
    <div class="index_top">
      <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>
    </div>
    <div class="index_main">
      <div class="index_menu">
        <el-menu
          default-active="2"
          class="el-menu-vertical-demo"
          background-color="#545c64"
          text-color="#fff"
          active-text-color="#ffd04b"
          :collapse="isCollapse"
          :unique-opened="true"
          :router="true"
        >
          <el-submenu index="1">
            <template slot="title">
              <i class="el-icon-location"></i>
              <span>导航一</span>
            </template>
            <el-menu-item-group>
              <template slot="title">分组一</template>
              <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">
              <template slot="title">选项4</template>
              <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="index_content" style="height:200px;background:#f00">
        123456789
      </div>
    </div>
  </div>
</template>
 
<script>
export default {
  data () {
    return {
      isCollapse: true
    }
  },
  methods: {
    checkMunuFn () {
      this.isCollapse = !this.isCollapse
    }
  }
}
</script>
 
<style scoped lang="scss">
  .el-menu-vertical-demo:not(.el-menu--collapse) {
    width: 200px;
    min-height: 800px;
  }
.index_page {
  position: relative;
  height: 100%;
  .index_top {
    height: 70px;
    background-color: gold;
  }
  .index_menu {
  }
  .index_main{
    display: flex;
  }
  .index_content {
    width:100%;
    background-color: pink;
  }
}
</style>