Bootstrap 4 中 hidden-* 和 visible-* 类都去哪了？

之前使用过一个CMS开发过后台系统，使用了 Bootstrap3，里面有好个非常好用的css类 hidden-* 和 visible-*，可以方便地实现响应式。最近帮朋友改一个基于 Bootstrap 4 开发的系统，却发现找不到这两个好用的类啦。后来仔细看了一下，发现在 Bootstrap 4 中，这2个类前缀已经被移除了。

取而代之的是新的控制 display 的方法，见这里：Display property · Bootstrap

几个示例

下面的示例来自 Stackoverflow

Show/hide for breakpoint and down:

hidden-xs-down (hidden-xs) = d-none d-sm-block hidden-sm-down (hidden-sm hidden-xs) = d-none d-md-block hidden-md-down (hidden-md hidden-sm hidden-xs) = d-none d-lg-block hidden-lg-down = d-none d-xl-block hidden-xl-down (n/a 3.x) = d-none(same as hidden)

Show/hide for breakpoint and up:

hidden-xs-up = d-none (same as hidden) hidden-sm-up = d-sm-none hidden-md-up = d-md-none hidden-lg-up = d-lg-none hidden-xl-up (n/a 3.x) = d-xl-none

Show/hide only for a single breakpoint:

hidden-xs (only) = d-none d-sm-block (same as hidden-xs-down) hidden-sm (only) = d-block d-sm-none d-md-block hidden-md (only) = d-block d-md-none d-lg-block hidden-lg (only) = d-block d-lg-none d-xl-block hidden-xl (n/a 3.x) = d-block d-xl-none visible-xs (only) = d-block d-sm-none visible-sm (only) = d-none d-sm-block d-md-none visible-md (only) = d-none d-md-block d-lg-none visible-lg (only) = d-none d-lg-block d-xl-none visible-xl (n/a 3.x) = d-none d-xl-block