学习使用express

向右看齐 2022-06-13 23:16 233阅读 0赞

根据推酷的一篇文章学习express，途中遇到下列的问题：  
文章地址：[http://www.tuicool.com/articles/jueARjE\#c-25892][http_www.tuicool.com_articles_jueARjE_c-25892]  
\- 运行mongodb

E:\Program Files\MongoDB\Server\3.4\bin>mongod.exe --dbpath ../blog/

*  依赖模块更新  
    在不知道最新版本是多少的情况下可以用“\*”或者“latest”代替版本号  
    还有个插件npm-check（还没用过，查到的）

$ npm install -g npm-check     //安装
    $ npm-check -u                 //检查版本

*  Error: Connection strategy not found
    
    connect-mongo版本问题  
    new MongoStore: \{ url: ‘your\_db\_url’\}  
    [https://github.com/kcbanner/connect-mongo\#create-a-new-connection-from-a-mongodb-connection-string][https_github.com_kcbanner_connect-mongo_create-a-new-connection-from-a-mongodb-connection-string]
 *  启动报错express-session

Sun, 04 Jun 2017 13:56:30 GMT express-session deprecated undefined resave option; provide resave option at app.js:56:9
    Sun, 04 Jun 2017 13:56:30 GMT express-session deprecated undefined saveUninitialized option; provide saveUninitialized option at app.js:56:9

解决：  
添加前两行配置

app.use(session({
        resave:false,//添加这行 
        saveUninitialized: true,//添加这行 
        //防止篡改 cookie
        secret: settings.cookieSecret,
        //key 的值为 cookie 的名字
        key: settings.db,
        //设置 cookie 的 maxAge 值设定 cookie 的生存期 30天
        cookie: {maxAge: 100*60*60*24*30},
        // store 参数为 MongoStore 实例 把会话信息存储到数据库中，以避免丢失
        store: new MongoStore({
            /*db: settings.db, host: settings.host, port: settings.port,*/
            url:'mongodb://localhost/'+settings.db
        })
    }));

*  Error: req.flash() requires sessions

var session = require('express-session');
    var flash = require('connect-flash');//上面要引用这个插件
    var routes = require('./routes/index');
    
    app.use(session({
       ...}));//flash依赖session模块
    
    app.use(flash());//这句话卸载session后面
    
    routes(app);//路由文件写在最后

[http_www.tuicool.com_articles_jueARjE_c-25892]: http://www.tuicool.com/articles/jueARjE#c-25892
[https_github.com_kcbanner_connect-mongo_create-a-new-connection-from-a-mongodb-connection-string]: https://github.com/kcbanner/connect-mongo#create-a-new-connection-from-a-mongodb-connection-string