const express=require(‘express‘);
const static=require(‘express-static‘); //托管静态文件
const cookieParser=require(‘cookie-parser‘);　　//解析cookie
const cookieSession=require(‘cookie-session‘);　　//解析session
const bodyParser=require(‘body-parser‘);　　　　//解析post数据
const multer=require(‘multer‘);
const consolidate=require(‘consolidate‘);
const mysql=require(‘mysql‘);

//连接池
const db=mysql.createPool({host: ‘localhost‘, user: ‘root‘, password: ‘123456‘, database: ‘blog‘});

var server=express();
server.listen(8080);

//1.解析cookie
server.use(cookieParser(‘sdfasl43kjoifguokn4lkhoifo4k3‘));

//2.使用session
var arr=[];
for(var i=0;i<100000;i++){
  arr.push(‘keys_‘+Math.random());
}
server.use(cookieSession({name: ‘zns_sess_id‘, keys: arr, maxAge: 20*3600*1000}));

//3.post数据
server.use(bodyParser.urlencoded({extended: false}));
server.use(multer({dest: ‘./www/upload‘}).any());

//4.配置模板引擎
//输出什么东西
server.set(‘view engine‘, ‘html‘);
//模板文件放在哪儿
server.set(‘views‘, ‘./template‘);
//哪种模板引擎
server.engine(‘html‘, consolidate.ejs);

//接收用户请求
server.get(‘/‘, (req, res, next)=>{
  //查询banner的东西
  db.query("SELECT * FROM banner_table", (err, data)=>{
    if(err){
      res.status(500).send(‘database error‘).end();
    }else{
      res.banners=data;

      next();
    }
  });
});
server.get(‘/‘, (req, res, next)=>{
  //查询文章列表
  db.query(‘SELECT ID,title,summery FROM article_table‘, (err, data)=>{
    if(err){
      res.status(500).send(‘database error‘).end();
    }else{
      res.articles=data;

      next();
    }
  });
});
server.get(‘/‘, (req, res)=>{
  res.render(‘index.ejs‘, {banners: res.banners, articles: res.articles});
});

server.get(‘/article‘, (req, res)=>{
  res.render(‘conText.ejs‘, {});
});



//4.static数据
server.use(static(‘./www‘));

<div class="content">
    <div class="banner">
      <ul class="clearfix">
        <% for(var i=0;i<banners.length;i++){ %>
        <li>
          <img src="<%= banners[i].src %>" alt=""/>
          <div class="text-box">
            <h2><%= banners[i].title %></h2>
            <p><%= banners[i].sub_title %></p>
          </div>
        </li>
        <% } %>
      </ul>
      <ol>
          <li class="active"></li>
          <li></li>
          <li></li>
      </ol>
    </div>
    <div class="newsList">
      <ul>
        <% for(var i=0;i<articles.length;i++){ %>
        <li>
          <a href="/article?id=<%= articles[i].ID %>">
            <h2><%= articles[i].title %></h2>
            <p><%= articles[i].summery %></p>
          </a>
        </li>
        <% } %>
      </ul>
    </div>
</div>