https://blog.youkuaiyun.com/webxiaoma/article/details/56495585 https://blog.youkuaiyun.com/mergerly/article/details/81702264 http://www.360doc.com/content/17/1010/09/33093582_693680058.shtml 详解git pull和git fetch的区别: https://blog.youkuaiyun.com/weixin_41975655/article/details/82887273