http模块

var http = require("http");var items = [];http.createServer((req,res)=>{    switch (req.method){        case "POST":        var item = "";        req.on("data",(chunk)=>{            item += chunk;        });        req.on("end",()=>{            items.push(item);            items.forEach((e)=>{res.write(e)});            res.end();        })        break;        case "GET":        var body = items.map((item,i)=>{            return i + ")" + item;        });        res.setHeader("Content-Length",Buffer.byteLength(body));        res.setHeader("Content-Type","text/plain;charset='utf8'");        res.end(body);        break;        default:        res.end("404 not found");        break;    };}).listen(4002);