app.post('/uploadImg’,function(req, res, next){ console.log(req.body.localUrl);//成功 console.log(req.files.imgFile.path);//成功

    var form = new formidable.IncomingForm();
    form.keepExtensions = true;//保留后缀 .jpg/.png

    
    var folderName = new Date().Format('yyyy-MM-dd');
    var dirPath = __dirname+"/../public/uploadimg/"+folderName+"/";

    console.log(dirPath);
    if(!fs.existsSync(dirPath)){//如果没有这个文件夹就创建文件夹
        fs.mkdirSync(dirPath);
    }

    form.uploadDir = dirPath;//设置文件上传的目录

    form.parse(req, function(err, fields, files){
        console.log(files.imgFile);//问题出现在这里，怎么返回的是undefined?
        var filePath = files.imgFile.path.replace(/\\/g, '/');
        var resPath = '/uploadimg/'+folderName+'/'+filePath.substring(filePath.lastIndexOf('/')+1);
        res.send({"error":0,"url":resPath});
    })
})