七牛 js 使用plupload 小文件上传没问题，超过4M的文件上传失败
err{"status":400,"response":"{"error":"block 0: expect 4194304 bytes but only 0 bytes uploaded"}","file":{"id":"o_1atb6ecae1ug243c1binr9a1b147","name":"flower.png","type":"image/png","size":18752502,"origSize":18752502,"loaded":18752502,"percent":100,"status":5,"lastModifiedDate":"2016-09-23T06:41:02.000Z","speed":"18366799"},"code":-200} at index.html:171
errTip"请求报文格式错误。(400：block 0: expect 4194304 bytes but only 0 bytes uploaded)" at index.html:172
![[Web front-end] Démarrage rapide de Node.js](https://img.php.cn/upload/course/000/000/067/662b5d34ba7c0227.png)
用真机试成功了，又被模拟器坑惨了，不过还是想知道为什么在模拟器上不行