一.首先创建新的Demo

二.在APP里面绑定DemoStudent

<template>
  <img alt="Vue logo" src="./assets/logo.png">
  <!-- <HelloWorld msg="Welcome to Your Vue.js App"/> -->
  <demo-student></demo-student>
</template>

<script>
// import HelloWorld from './components/HelloWorld.vue'
import DemoStudent from './components/DemoStudent.vue';

export default {
  name: 'App',
  components: {
    // HelloWorld
    DemoStudent
  }
}
</script>

<style>
#app {
  font-family: Avenir, Helvetica, Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-align: center;
  color: #2c3e50;
  margin-top: 60px;
}
</style>

三.源码附上

<template>
        <el-container>
            <el-header height="80px" style="padding: 0;">
                <div class="header">教务系统学生管理</div>
            </el-header>
            <el-container>
                <el-aside width="200px">
                    <el-menu class="aside" @select="selectFunc" default-active="1" :unique-opened="true">
                        <el-sub-menu index="1">
                            <template #title>
                                <span>七年级</span>
                            </template>
                            <el-menu-item index="1">1班</el-menu-item>
                            <el-menu-item index="2">2班</el-menu-item>
                            <el-menu-item index="3">3班</el-menu-item>
                        </el-sub-menu>
                        <el-sub-menu index="2">
                            <template #title>
                                <span>八年级</span>
                            </template>
                            <el-menu-item index="4">1班</el-menu-item>
                            <el-menu-item index="5">2班</el-menu-item>
                            <el-menu-item index="6">3班</el-menu-item>
                        </el-sub-menu>
                        <el-sub-menu index="3">
                            <template #title>
                                <span>九年级</span>
                            </template>
                            <el-menu-item index="7">1班</el-menu-item>
                            <el-menu-item index="8">2班</el-menu-item>
                            <el-menu-item index="9">3班</el-menu-item>
                        </el-sub-menu>
                    </el-menu>
                </el-aside>
                <el-container>
                    <el-header height="80px" style="padding: 0;margin: 0;">
                        <el-container class="subHeader">
                            <div class="desc">{{ desc }}</div>
                            <el-button style="width: 100px;height: 30px;margin: 20px;">新增记录</el-button>
                        </el-container>
                    </el-header>
                    <el-main style="margin: 0;padding: 0;">
                        <div class="content">
                            <el-table :data="stus">
                                <el-table-column
                                prop="name"
                                label="姓名">
                                </el-table-column>
                                <el-table-column
                                prop="age"
                                label="年龄">
                                </el-table-column>
                                <el-table-column
                                prop="sex"
                                label="性别">
                                </el-table-column>
                                <el-table-column
                                prop="date"
                                label="录入日期">
                                </el-table-column>
                            </el-table>
                        </div>
                    </el-main>
                    <el-footer height="30px" class="footer">Vue框架搭建,ElementPlus提供组件支持</el-footer>
                </el-container>
            </el-container>
        </el-container>
    </template>

    <style scoped>
    .header{
        font-size: 30px;
        line-height: 80px;
        background-color: #f1f1f1;
    }
    .aside{
        background-color: wheat;
        height: 600px;
    }
    .subHeader{
        background-color: cornflowerblue;
    }
    .desc{
        font-size: 25px;
        line-height: 80px;
        color: white;
        width: 800px;
    }
    .content{
        height: 410px;
    }
    .footer{
        background-color: dimgrey;
        color: white;
        font-size: 17px;
        line-height: 30px;
    }
    </style>

<script>
export default{
    data(){
        return{
            desc:'七年级1班学生统计',
            stus:[
                {
                    name:'小王',
                    age:14,
                    sex:'男',
                    date:'2020年8月15日'
                },{
                    name:'小张',
                    age:15,
                    sex:'男',
                    date:'2020年8月15日'
                },{
                    name:'小秋',
                    age:15,
                    sex:'女',
                    date:'2020年8月15日'
                }
            ] 
        }
    },
    methods:{
        selectFunc(index){
            let strs=['七','八','九']
            let rank=strs[Math.floor((index-1)/3)]
            this.desc=`${rank}年级${((index-1)%3)+1}班学生统计`
        }
    }
}
</script>

四.效果图（新增记录还未实现）