vue2+koa2+mongodb分页

后端

const Koa = require('koa2');
const Router = require('koa-router');
const Monk = require('monk');//链接mongodb数据库中间件
const app = new Koa();
const router=new Router();
const db=new Monk('localhost/school');
const students = db.get('article');
const bodyParser = require('koa-bodyparser')//解析请求参数中间件
app.use(bodyParser())
app.use(async (ctx, next) => {
     console.log(`请求信息：\n 方式: ${ctx.request.method}  \n 地址：${ctx.request.url}...`);
     ctx.set("Access-Control-Allow-Origin", "*");
     await next();//相当于java的filter放行
});
router
    .get('/', async ( ctx ) => {
        ctx.response.type = 'text/html';
        ctx.body = 'hi'
    })
    .post('/vueDemo/getStudents', async ( ctx ) => {
        let totle = await students.count();//表总记录数
        //koa-bodyparser解析前端参数
        let reqParam= ctx.request.body;//
        let page = Number(reqParam.page);//当前第几页
        let size = Number(reqParam.size);//每页显示的记录条数
        //显示符合前端分页请求的列表查询
        let options = { "limit": size,"skip": (page-1)*size};
        let st = await students.find({},options,function(err,docs){
            if (err) {console.log(err);return;}
            else{console.log(docs);return;}
        });
        //是否还有更多
        let hasMore=totle-(page-1)*size>size?true:false;
        ctx.response.type = 'application/json';
        //返回给前端
        ctx.body = {hasMore:hasMore,students:st,totle:totle};
    })
app.use(router.routes());
app.listen(3000, () => {
    console.log('[myapp]已经运行，端口为300')
})

数据库

{"name" : "小明","age" : 10.0}
{"name" : "丁少华", "age" : 20}
{"name" : "小张","age" : 18.0}
{"name" : "王新","age" : 30.0}
{"name" : "小红","age" : 16.0}

前端

<template>
  <div class="artList" >
      <!--列表-->
      <ul class="content">
        <li  v-for="st in students">
          <div>{{st.name}}</div>
          <div>{{st.age}}</div>
        </li>
      </ul>
      <!--分页-->
      <div class="pageinfo">
        共{{totle}}条记录
        <button v-on:click="fy('s')">上一页</button>
        <button v-on:click="fy('x')" >下一页</button>
        当前第{{page}}页
      </div>
    </div>
</template>
<script>
export default {
  name:'artlistCmp',
    data() {return { page:1,totle:0,students:[],hasMore:false,title:''}},
    methods:{
      getStudent(){
        var vm=this;
        this.service.getStudent({page:vm.page,size:3}).then(function(rep) {
          vm.totle=rep.data.totle;
          vm.students=rep.data.students;
          vm.hasMore=rep.data.hasMore;
        })
      },
      fy(param){
        if(param=='x'){
          if(!this.hasMore){alert('已经是最后一页了'); return false;}
          this.page++
        }else{
          if(this.page==1){ alert('已经是首页了');return false; }
          this.page--
        }
        this.getStudent()
      }
    },
    created(){this.getStudent();}
  }
</script>
<style>
  .artList{width: 100%}
  .list{width: 100%}
  li{
    display: block;
    height: 140px;
    background-color: aliceblue;
    margin-bottom: 20px;
  }
</style>

效果