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...

文本颜色 <!-- BootStrap4 文字颜色 --> <p class='text-muted'>柔和的文本</p> <p class='text-primary'>重要的文本</p> <p class='text-success'>执行成...