Git 先创建项目后提交到仓库[Note about fast-forwards]

1.初始化： 

git init

2.把项目添加到本地仓储：

git add .
git commit -am "备注"

3.添加远程地址

git remote add origin https://gitee.com/xxx/xxx.git

4.提交到仓库

git push -u origin master

5.本地分支和远程分支 建立连接

git branch --set-upstream-to=origin/master master

6.因为远程仓库是刚创建的，本地仓库和远程仓库有不同的开始点【没有共同的commit】，需要拉取代码

git pull origin master --allow-unrelated-histories

7.异常就是由【4/5】导致的

$ git push
To https://gitee.com/xxx/xxx.git
 ! [rejected]        master -> master (non-fast-forward)
error: failed to push some refs to 'https://gitee.com/xxx/xxx.git'
hint: Updates were rejected because the tip of your current branch is behind
hint: its remote counterpart. Integrate the remote changes (e.g.
hint: 'git pull ...') before pushing again.
hint: See the 'Note about fast-forwards' in 'git push --help' for details.