代码： var formidable=require(“formidable”);

function upload(response,request) { console.log(“Request handler ‘upload’ was called.”); //已输出

var form = new formidable.IncomingForm(); //日志显示，此行报错

console.log(“about to parse”); form.uploadDir="./tmp"; form.parse(request, function(error, fields, files) { console.log(“parsing done”); fs.renameSync(files.upload.path, “./tmp/test2.png”); response.writeHead(200, {“Content-Type”: “text/html”}); response.write(“received image:<br/>”); response.write("<img src=’/show’ />"); response.end(); }); }

错误日志： Request handler ‘upload’ was called.

D:\node_modules\formidable\lib\incoming_form.js:28 this.uploadDir = opts.uploadDir || os.tmpDir(); ^ TypeError: Object #<Object> has no method 'tmpDir’ at new IncomingForm (D:\node_modules\formidable\lib\incoming_form.js:28:41) at Object.upload [as /upload] (D:\requestHandlers.js:29:14) at route (D:\route.js:4:25) at Server.onRequest (D:\server.js:8:3) at Server.emit (events.js:70:17) at HTTPParser.onIncoming (http.js:1479:12) at HTTPParser.onHeadersComplete (http.js:102:31) at Socket.ondata (http.js:1375:22) at TCP.onread (net.js:334:27)

而且formidable模块也已经成功安装 我使用npm list查看，输入结果：

D:>npm list D:
├── formidable@1.0.14

错误是什么原因引发的呢？