doUpload() {
  var formData = new FormData($("#uploadForm")[0]);
  $.ajax({
   url: 'http://localhost:3011/upload',
   type: 'POST',
   data: formData,
   async: false,
   cache: false,
   contentType: false,
   processData: false,
   success: function (returndata) {
    alert(returndata);
   },
   error: function (returndata) {
    // alert(returndata);
   }
  });
 }
<form id="uploadForm">
     <p>上传文件：
      <input id="UpImage" type="file" name="file"/>
      <input id="text" type="text" name="text" value="232323"/>
     </p>
     <input type="button" value="上传" onClick={this.doUpload.bind(this)}/>
     <input type="button" onClick={()=>{this.submit()}} value="确定"/>
 </form>

exports.upload = function (req,res,next) {
//keepExtensions为true时，显示文件扩展名
 var form = new formidable.IncomingForm({keepExtensions:true});
//指定文件目录
 form.uploadDir = path.join(__dirname);
 form.parse(req,function (err,fields,files) {
  //fields存放的为json数据
  //files存放的是文件信息
  //更改文件目录,并且显示上传之前的名字
  fs.rename(files.file.path,__dirname+'/'+files.file.name,function (a,b) {
  });
  res.json({success:'修改成功'})
 });
};