node. JS Web Development: EXPRESS 4.x above using session and Cookie Records

About session and cookies I've been doing this for 2-3 days, and I find this thing a lot of trouble. Many tutorials keep this conversation in NoSQL, such as MONGO, or Redis, and so on. But I still want to keep it in my computer's memory, which is more traditional. There are many articles on the Internet, but basically you copy me, I copy you, And Express has a lot of this session/cookie middleware, always confusing. Many articles are donuts, completely rely on their own slowly to try, to read the document, to explore.

I am based on the middleware of Connect. This middleware feature is very powerful

Interested students can refer to: http://blog.fens.me/nodejs-connect/

Installation here will not say. Here we come to realize, we hope to be useful to everyone

Import module in App.js

1 var connect = require (' Connect ');

Join before routing the distribution statement.

1 App.use (Bodyparser.json ()); 2 App.use (bodyparser.urlencoded ()); 3 App.use (Cookieparser ()); 4 App.use (Connect.session ({secret: ' lgphp ', key: ' lgphp ', cookie: {maxage:20000}}));  // Session duration is 20 seconds, this is in milliseconds, so we have a session, this is a global setting 5 routes (APP);

First say session, set the session KV

Req.session.sessname = ' I am a sesion ';

So we set up a session variable named Sessname, the value is Iam a sesion, the session duration is 20 seconds. Typing on Ubuntu is still not very flexible

Get session

Res.send (' session: ' + req.session.sessname)

Delete session

   Req.session.destroy ();

Determine if the session exists

if (req.session) {   // determine if session is destroyed

The above session operation is enough to complete the usual logic.

The following is a cookie, which we often use.

Set cookies

1   Res.cookie (' cookiename ', ' I am a cookie ', {maxage:20000,httponly:true, Path: '/'}); // cooike Duration (sec)

Get the value of a cookie

var c = req.cookies.cookiename   // This is a Dictionary object, you can use parentheses to get

Delete cookies, many online, but it seems to be useless, some have set the expiration time to 0, I tried, the value of the cookie is not, but the cookie is still in, with Chrome to see there.

   Res.cookie (' cookiename ', ' null ', {maxage:0});

There's no problem with deleting it.

Determine if a cookie exists, such as login and permission verification. After the cookie expires, it becomes a undefined, so we judge

if (' undefined ' = = = (typeof  req.cookies.cookiename)) {             res.send (' deleted cookie ');         }