node.js接收前端上传的图片

主要用到了formidable模块：

/**
 * [导出一个中间件，formupload，用于处理文件上传；]
 */
exports.formupload = function(req,res,next){
    //console.log(req);
    var form = new formidable.IncomingForm();
    var uploadDir = path.normalize(__dirname+'/'+"../avatar");
    form.uploadDir = uploadDir;
    console.log(uploadDir);
    form.parse(req, function(err, fields, files) {
        for(item in files){
            (function(){
                var oldname = files[item].path;
                var newname = files[item].name === 'blob' ? oldname+'.xml' : oldname+"."+files[item].name.split('.')[1];
                fs.rename(oldname,newname,function(err){
                    if(err) console.log(err);
                    console.log('修改成功');
                })
            })(item);
        }
        console.log(util.inspect({fields: fields, files: files}));
        res.send('2');
    });