在本地电脑上新建了一个分支，代码写完之后，新关联远程代码库并提交代码：
git init
git add .
git commit -m "标注释"
git remote add origin https://gitee.com/fangfu/xxxx.git
在执行到git push的时候报了个错：
git push
fatal: The current branch master has no upstream branch.
To push the current branch and set the remote as upstream, use
git push --set-upstream origin master
这个意思是说没有和远程库相关联。 按照提示，推送当前分支并将远程设置为上游，执行git push –set-upstream origin master
这里第一次执行的时候，会弹出输入用户名密码的对话框。如果密码输错了，会报下面这个错误：
git push --set-upstream origin master
remote: Incorrect username or password ( access token )
fatal: Authentication failed for 'https://gitee.com/fangfu/xxxx.git/'
而且再次执行，不会弹出之前的对话框了。
这里需要改windows的凭据：
我是win10系统。点击开始–设置，出现windows设置，直接搜索“凭据管理器”，
找到普通凭据–编辑刚刚生成的git:https://gitee.com的凭据，修改用户密码就可以了。
如果执行git push过程中出现如下错误：
git push --set-upstream origin master
To https://gitee.com/fangfu/xxxx.git
! [rejected] master -> master (fetch first)
error: failed to push some refs to 'https://gitee.com/fangfu/xxxx.git'
hint: Updates were rejected because the remote contains work that you do
hint: not have locally. This is usually caused by another repository pushing
hint: to the same ref. You may want to first integrate the remote changes
hint: (e.g., 'git pull ...') before pushing again.
hint: See the 'Note about fast-forwards' in 'git push --help' for details.
大概是说，本地和远程的文件要先合并以后，才能上传新的文件， 所以我们需要先把远程的拉下来
git pull origin master
如果在执行git pull中报下面的这个错误：
git pull origin master
From https://gitee.com/fangfu/xxxx
* branch master -> FETCH_HEAD
fatal: refusing to merge unrelated histories
就表示这是两个不同的项目，无法合并，
如果要合并，需要添加一行代码：–allow-unrelated-histories：
git pull origin master --allow-unrelated-histories
执行git clone，报错：
error: The requested URL returned error: 401 Unauthorized while accessing https://gitee.com/fangfu/demo.git/info/refs
fatal: HTTP request failed
这个问题一般是由于git版本太旧的问题。
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