17-nodejs 之 connect 更新说明

之前的使用 connect 创建服务器的方法：

require("connect").createServer()

现在报错：TypeError: connect.createServer is not a function。

• 因为 connect 在更新之后就取消了这种创建服务的方法，connect 作为一个继承自 http 的中间件（Connect is an extensible HTTP server framework for node using "plugins" known as middleware），现在使用和创建服务的方法调整如下：

/**
 * Created by yjw on 2017/12/23.
 */
var http = require("http");
var connect = require("connect");
var app = connect();
var time = require("./time.js");

//记录请求情况
//app.use(connect.logger("dev"));

//实现中间件
app.use(time({time:500}));
//实现快速响应
app.use(function(req,res,next){
    if("/a"==req.url){
        res.writeHead(200);
        res.end("Fast!!!");
    }else{
        next();
    }
});
//实现模拟的慢速响应
app.use(function(req,res,next){
    if("/b"==req.url){
        setTimeout(function(){
            res.writeHead(200);
            res.end("Slow!!!");
        },1000);
    }else{
        next();
    }
});
//create node.js http server and listen on port
http.createServer(app).listen(3011);

• time.js 为我实现的一个中间件，不再 po 出，这里主要说明 connect 更新之后如何创建服务。

其中 app.use(connect.logger("dev")); 报错：TypeError: connect.logger is not a function：

• 原因是一些中间件和库都做了更新，目前被抛弃和与之对应的新库或者中间件总结如下：

1.body-parser - previous bodyParser, json, and urlencoded. You may also be interested in:body,co-body,raw-body
2.compression - previously compress
3.connect-timeout - previously timeout
4.cookie-parser - previously cookieParser
5.cookie-session - previously cookieSession
6.csurf - previously csrf
7.errorhandler - previously error-handler
8.express-session - previously session
9.method-override - previously method-override
10.morgan - previously logger
11.response-time - previously response-time
12.serve-favicon - previously favicon
13.serve-index - previously directory
14.serve-static - previously static
15.vhost - previously vhost

`app.use(connect.logger("dev"));修改完用法如下：

var morgan = require("morgan");
//记录请求情况
app.use(morgan("dev"));

• 前提：使用 npm 安装 connect 和 morgan。