在我的应用程序中,我需要使用 express 框架设置一个 cookie。我已经尝试了以下代码,但它没有设置 cookie。
var express = require('express'), http = require('http'); var app = express(); app.configure(function(){ app.use(express.cookieParser()); app.use(express.static(__dirname + '/public')); app.use(function (req, res) { var randomNumber=Math.random().toString(); randomNumber=randomNumber.substring(2,randomNumber.length); res.cookie('cokkieName',randomNumber, { maxAge: 900000, httpOnly: true }) console.log('cookie have created successfully'); }); }); var server = http.createServer(app); var io = require('socket.io').listen(server); server.listen(5555);
在 Express 中使用中间件的顺序很重要:前面声明的中间件将首先被调用,如果它可以处理请求,则后面声明的任何中间件都不会被调用。
如果express.static正在处理请求,则需要向上移动中间件:
express.static
// need cookieParser middleware before we can do anything with cookies app.use(express.cookieParser()); // set a cookie app.use(function (req, res, next) { // check if client sent cookie var cookie = req.cookies.cookieName; if (cookie === undefined) { // no: set a new cookie var randomNumber=Math.random().toString(); randomNumber=randomNumber.substring(2,randomNumber.length); res.cookie('cookieName',randomNumber, { maxAge: 900000, httpOnly: true }); console.log('cookie created successfully'); } else { // yes, cookie was already present console.log('cookie exists', cookie); } next(); // <-- important! }); // let static middleware do its job app.use(express.static(__dirname + '/public'));
此外,中间件需要 要么 结束请求(通过发回响应),要么将请求传递给下一个中间件。在这种情况下,我通过next()在设置 cookie 时调用来完成后者。
next()
更新
到目前为止,cookie 解析器是一个单独的 npm 包,所以不要使用
app.use(express.cookieParser());
您需要使用单独安装它npm i cookie-parser,然后将其用作:
npm i cookie-parser
const cookieParser = require('cookie-parser'); app.use(cookieParser());