让我们一起学习《Node.js入门》一书吧！

Node.js入门读完本书之后，你将完成一个完整的web应用，该应用允许用户浏览页面以及上传文件。

里面对一些知识的讲解，让你略窥Node.js的门径。最好一段代码一段代码的写下来，我的习惯是手里拿着笔，边写重点的词，边思索，再敲敲代码。一天到两天你能看完这本书，我看过一遍了，计划再寻摸一遍。有问题大家可以一起探讨。

四个文件在同一个目录下

启动

cmd窗口：

输入 node D:workspace odejsindex.js

也可以定位到当前目录后：

D:workspace odejs node index.js

打开

localhost:8080/start

说下，此书最后的例子完整代码中有点问题。你应该会出现类似no such file or directory ，或者是此文件已经存在的错误提示。修改处已经做了标注：

具体文件：

index.js

var server=require("./server");

var router=require("./router");

var requestHandlers=require("./requestHandlers");

 

var handle={};

handle["/"]=requestHandlers.start;

handle["/start"]=requestHandlers.start;

handle["/upload"]=requestHandlers.upload;

handle["/show"]=requestHandlers.show;

server.start(router.route,handle);

server.js

var http = require("http");

var url=require("url");

function start(route,handle){

function onRequest(request,response){

var postData="";

var pathname=url.parse(request.url).pathname;

   console.log("Request for"+pathname+" received");

route(handle,pathname,response,request);

}

http.createServer(onRequest).listen(8080);

console.log("Server has started");

}

exports.start=start;

router.js

var http = require("http");
var url=require("url");
function start(route,handle){
function onRequest(request,response){
var postData="";
var pathname=url.parse(request.url).pathname;
   console.log("Request for"+pathname+" received");
route(handle,pathname,response,request);
}
http.createServer(onRequest).listen(8080);
console.log("Server has started");
}
exports.start=start;

requestHandler.js

//var exec=require("child_process").exec;

var querystring=require("querystring"),

fs=require("fs"),

formidable=require("formidable");

 

function start(response){

console.log("start was called");

var body="<!DOCTYPE html>"+

'<head><meta http-equiv="content-type" content="text/html;charset=utf-8" /><title>'+

'这是个测试</title></head><body>'+

'<form action="/upload" enctype="multipart/form-data" method="post">'+

    '<input type="file" name="upload" />'+

    '<input type="submit" value="Upload file" />'+

    '</form>'+'</body></html>';

response.writeHead(200,{"Content-Type":"text/html"});

response.write(body);

response.end();

}

function upload(response,request){

console.log("upload was called");

var form=new formidable.IncomingForm({uploadDir:"tmp"});//Modify

console.log("about to parse");

form.parse(request,function(error,fields,files){

console.log("parsing done");

fs.renameSync(files.upload.path,"tmp/test.jpg");//The Dir,pay attention

response.writeHead(200, {"Content-Type": "text/html"});

    response.write("Received image:<br /><img src='/show' />");

    response.end();

});

}

function show(response){

console.log("Show was callde");

fs.readFile("tmp/test.jpg","binary",function(error,file){//The Dir,pay attention

if(error){

response.writeHead(500,{"Content-Type":"text/plain"})

response.write(error + "
");

response.end();

} else {

response.writeHead(200, {"Content-Type": "image/jpeg"});

response.write(file, "binary");

response.end();

 }

})

}

exports.start=start;

exports.upload=upload;

exports.show=show;

你可以下载 node.js入门正确示例