问题一：
当push代码上去仓库时，出现
! [rejected] master -> master (fetch first) error: failed to push some refs to 'https://github.com/Jierism/MyLocations.git' hint: Updates were rejected because the remote contains work that you do hint: not have locally. This is usually caused by 。。。
解决：
git push -f
git pull
git config branch.master.remote origin
git config branch.master.merge refs/heads/master
git pull
详细参考：http://blog.csdn.net/chain2012/article/details/7476493
问题二：
push代码，插入注释git commit -m "注释语句"时，出现
On branch master Your branch is ahead of 'origin/master' by 2 commits. (use "git push" to publish your local commits) nothing to commit, working directory clean。。。
解决：
git pull --rebase
再继续push
问题三：
push代码，输入git remote add origin git@github.com:djqiang（github帐号名）/gitdemo（项目名）.git，出现
fatal: remote origin already exists
解决：
git remote rm origin
接着再输入一次地址就OK