路由:router

用户功能

/user ----> index.html

/user/login ----> login.html

/user/reg ----> reg.html

/user userRouter => express.Router();

app.use("/user",userRouter);

新闻功能

/news ----> index.html
/news/edit ----> edit.html
/news/add ----> add.html
router.js

var express = require("express");
var app = express();
app.listen(9000);var userRouter = express.Router();
var newsRouter = express.Router();// /user  /newsapp.use("/user",userRouter);
app.use("/news",newsRouter);userRouter.get("/",function(req,res){res.send("user--->index.html"); 
});userRouter.get("/login",function(req,res){res.send("user--->login.html"); 
});userRouter.get("/reg",function(req,res){res.send("user--->reg.html");   
});newsRouter.get("/",function(req,res){res.send("news--->index.html"); 
});newsRouter.get("/edit",function(req,res){res.send("user--->edit.html");  
});newsRouter.get("/add",function(req,res){res.send("user--->add.html");   
});

---

express

Express 应用生成器

npm install express-generator -g

创建应用

express myapp -e

下载模块

cnpm i

启动服务:

npm start

node bin/www

npm run script名字

---

cnpm i -S cookie-session multer consolidate mysql

---

连接池：

mysql.createConnection({})
mysql.createPool({
connectionLimit:10默认是10条
})

---

app.js:

var createError = require("http-errors");
var logger = require("morgan");
var express = require("express");
var path = require("path");
var cookieParser = require("cookie-parser");
var cookieSession = require("cookie-session");
var consolidate = require("consolidate");
var multer = require("multer");var indexRouter = require("./routes/index");
var usersRouter = require("./routes/users");var app = express();//文件上传
var multerMiddleware = multer({dest:"upload"}).any();
app.use(multerMiddleware);// 模板引擎
app.set("view engine", "html");
app.set("views", "views");
app.engine("html", consolidate.ejs);//日志
app.use(logger("dev"));//处理post数据
app.use(express.json());
app.use(express.urlencoded({ extended: false }));//cookie-session
app.use(cookieParser());var keys = [];
for(var i = 0; i < 10000; i  ){keys.push("sessionid" Math.random());
}app.use(cookieSession({name:"sid",keys,maxAge:30*60*1000 //ms
}));//静态服务器
app.use(express.static("public"));app.use("/", indexRouter);
app.use("/users", usersRouter);// catch 404 and forward to error handler
app.use(function(req, res, next) {next(createError(404));
});// error handler
app.use(function(err, req, res, next) {// set locals, only providing error in developmentres.locals.message = err.message;res.locals.error = req.app.get("env") === "development" ? err : {};// render the error pageres.status(err.status || 500);res.render("error");
});module.exports = app;

users.js:

var express = require("express");
var pool = require("../utils/pool");
var md5 = require("../utils/md5");var router = express.Router();var pageSize = 10;/* /users ---> index.html */
router.get("/", function(req, res) {if(!req.session.isLogin){res.redirect("/users/login");}var pageNo = req.query.pageNo || 1;//总页数var totalSql = "select count(*) as count from user_table";pool.query(totalSql,function(err,data){console.log(data);if(data.length == 0){//没有数据res.render("./users/index.html",{pageCount:0});} else {//有数据var count  = data[0].count;var pageCount = Math.ceil(count/pageSize);//做分页var beginIndex = (pageNo-1)*pageSize;var querySql = `select * from user_table limit ${beginIndex},${pageSize}`;console.log(1111,querySql);pool.query(querySql,function(err,data){console.log(111,data,pageCount);res.render("./users/index.html",{data,pageCount,pageNo});});}});
});//渲染页面
router.get("/login", function(req, res) {res.render("./users/login2",{error:1,msg:""});
});//处理接口
router.post("/login", function(req, res) {var {user,pass} = req.body;pass = md5(pass);var sql = `select * from user_table where username="${user}" and password="${pass}"`;pool.query(sql,function(err,data){if(data.length == 0){//用户名或者密码错误//res.send({error:0,msg:"用户名或者密码错误"});res.render("./users/login2",{error:0,msg:"用户名或者密码错误"});} else {//res.send({error:1,msg:"登陆成功"});req.session.isLogin = true;res.redirect("/");}   });
});router.get("/reg", function(req, res) {res.render("./users/reg");
});
//处理接口
router.post("/reg", function(req, res) {var {user,pass} = req.body;pass = md5(pass);var querySql = `select * from user_table where username="${user}"`;pool.query(querySql,function(err,data){if(data.length == 0){//用户不存在 可以注册var inserSql = `insert into user_table(username,password) values("${user}","${pass}")`pool.query(inserSql,function(err){res.send({error:1,msg:"注册成功"}); });} else {//用户已经存在res.send({error:0,msg:"用户已存在"});}   }); 
});module.exports = router;

SSR

分页:

select * from user_table; 查询所有

每页显示10条数据 pageSize = 10;

select * from user_table limit beginIndex,pageSize;

select * from user_table limit 1,10;

页数pageNo      beginIndex1            0  - 92           10 - 193           20 - 29

beginIndex = (pageNo-1)*pageSize

pageCount总页数 = Math.ceil(总数据/每页显示多少条) = Math.ceil(count/pageSize)

count? ===> select count(*) as count from user_table;

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get  --- req.query   /url?name=value  ----> /url?name=aaareq.params  /url/:name       ----> /url/aaapost --- req.body

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