最近学习nodejs，参考文章：。

其中在最后一个实例中，按照教程编写代码会出现以下错误：

Error: EXDEV, cross-device link not permitted 'C:\Users\DONGQI~1\AppData\Local\Temp\726b6c28afd4cc33c2644e203756d4cd'    at Object.fs.renameSync (fs.js:543:18)    at F:\nodejsSpace\requestHandlers.js:34:8    at IncomingForm.
    
      (F:\nodejsSpace\node_modules\formidable\lib\incoming_form.js:92:9)    at IncomingForm.EventEmitter.emit (events.js:92:17)    at IncomingForm._maybeEnd (F:\nodejsSpace\node_modules\formidable\lib\incoming_form.js:533:8)    at F:\nodejsSpace\node_modules\formidable\lib\incoming_form.js:211:12    at WriteStream.
     
       (F:\nodejsSpace\node_modules\formidable\lib\file.js:70:5)    at WriteStream.g (events.js:175:14)    at WriteStream.EventEmitter.emit (events.js:117:20)    at finishMaybe (_stream_writable.js:354:12)
     
    

查找资料说是windows下没有相关权限导致，只需要在var form = new formidable.IncomingForm();后加一句：form.uploadDir = 'tmp' 改变上传目录的地址就可以了。

以下为示例代码：

1、server.js

var http = require("http");var url = require("url");function start(route, handle) {  function onRequest(request, response) {    var pathname = url.parse(request.url).pathname;    console.log("Request for " + pathname + " received.");    route(handle, pathname, response, request);  }  http.createServer(onRequest).listen(8888);  console.log("Server has started.");}exports.start = start;

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);

function route(handle, pathname, response, request) {  console.log("About to route a request for " + pathname);  if (typeof handle[pathname] === 'function') {    handle[pathname](response, request);  } else {    console.log("No request handler found for " + pathname);    response.writeHead(404, {"Content-Type": "text/html"});    response.write("404 Not found");    response.end();  }}exports.route = route;

var querystring = require("querystring"), fs = require("fs"),    formidable = require("formidable");function start(response, postData) {  console.log("Request handler 'start' was called.");  var body = ''+    ''+    '
    '+    ''+    ''+    '
    
     '+    '
     '+    '
     '+    '
    
'+    ''+    '';    response.writeHead(200, {"Content-Type": "text/html"});    response.write(body);    response.end();}function upload(response, request) {  console.log("Request handler 'upload' was called.");  var form = new formidable.IncomingForm();  form.uploadDir = 'tmp';  console.log("about to parse");  form.parse(request, function(error, fields, files) {    console.log("parsing done");    fs.renameSync(files.upload.path, "./tmp/test.png");    response.writeHead(200, {"Content-Type": "text/html"});    response.write("received image:
");    response.write("");    response.end();  });}function show(response, postData) {  console.log("Request handler 'show' was called.");  fs.readFile("./tmp/test.png", "binary", function(error, file) {    if(error) {      response.writeHead(500, {"Content-Type": "text/plain"});      response.write(error + "\n");      response.end();    } else {      response.writeHead(200, {"Content-Type": "image/png"});      response.write(file, "binary");      response.end();    }  });}exports.start = start;exports.upload = upload;exports.show = show;