app.js

const express = require("express");
//引入路由器
const userRouter = require("./routers/user.js");
const productRouter = require("./routers/product.js");
const cartRouter = require("./routers/cart.js");
const indexRouter=require('./routers/index');

const session = require("express-session");
const cors = require('cors');

const app = express();



let corsOptions = {
  origin:["http://127.0.0.1:8080","http://localhost:8080"],
  credentials:true,
  optionsSuccessStatus: 200 // some legacy browsers (IE11, various SmartTVs) choke on 204
}
app.use(cors(corsOptions));
//设置跨域访问
// app.use(function (req, res, next) {
//   res.header('Access-Control-Allow-Origin', 'http://localhost:8080');
//   res.header('Access-Control-Allow-Headers', 'Content-Type, Content-Length, Authorization, Accept, X-Requested-With');
//   res.header('Access-Control-Allow-Methods', 'PUT, POST, GET, DELETE, OPTIONS');
//   res.header("Access-Control-Allow-Credentials",true);

//   if (req.method == 'OPTIONS') {
//     res.sendStatus(200); /*让options请求快速返回*/
//   } else {
//     next();
//   }
// })

app.use(express.json()); //在其他路由中间件前（尽可能靠前，以能够通过bodyPaser获取req.body）
app.use(express.urlencoded({ extended: false }));
// 使用 session 中间件
app.use(session({
    secret: 'zjffapp',// 对session id 相关的cookie 进行签名
    name: 'xz-app',   //这里的name值得是cookie的name，默认cookie的name是：connect.sid
    resave : false,
    saveUninitialized: true, // 是否保存未初始化的会话
    cookie : {
        maxAge : 1000 * 60 * 3, // 设置 session 的有效时间，单位毫秒
    },
}));
//app.use(cookieParser("zjffapp"));

//托管静态资源
app.use(express.static("public"));

//注册路由,建议放在其他中间件的后面
app.use("/user",userRouter);
app.use("/product",productRouter);
app.use("/cart",cartRouter);
app.use(indexRouter);

const port = 5050;
app.listen(port, () => console.log(`XZ App listening oe port:${port}`));