Update for Bootstrap 4 (2018) The hidden-* and visible-* classes no longer exist in Bootstrap 4. If you want to hide an element on specific tiers or breakpoints in Bootstrap 4, use...

初始化一个空仓库 git init 关联远程仓库 git remote add origin [url] 拉取远程内容 git pull 将远程仓库复制至到本地 git clone [url] 推送本地内容到远程仓库 git push origin master 添加到...