updates were rejected because the tip of your current branch is behind

报错"updates were rejected because the tip of your current branch is behind"的原因是你在尝试推送代码时，本地分支的提交落后于远程分支的提交。这意味着有其他人在你推送之前已经对远程分支进行了更新。为了解决这个问题，你可以使用git pull命令来将远程分支的更改合并到本地分支上，然后再次尝试推送。