新文件没有自动保存

![image](https://user-images.githubusercontent.com/26532614/28363857-b01de948-6cb4-11e7-9974-1ba9421d716f.png)
![image](https://user-images.githubusercontent.com/26532614/28363881-c2ea4cce-6cb4-11e7-9eff-a609c5bed042.png)
![image](https://user-images.githubusercontent.com/26532614/28363900-d9d32f00-6cb4-11e7-9acd-904dc225ddc4.png)
