距离上次发布 4.0 的最后一个 alpha 版已经过去了 7 个月。今天，Bootstrap 4 的首个 Beta 版终于发布了。 该版本取消将 Normalize.css 作为依赖关系，而是 fork 其中的一部分并和 Bootstrap 自家的 Reboot 混合，以获得更稳定的标准化方法。还对导航、网格进行了改进以及对 Flexbox 进行一些兼容性的处理。
此外，该版本将 jQuery 和 Popper 移动到了 peerDependencies ，因为它们不是 Bootstrap 每个部分所要求的。往下阅读更多的更新内容。 值得关注的更新： Dropped
Normalize.css as a dependency, forking some of it and remixing it with
our own Reboot for a more stable normalization approach. Update navbar responsive behaviors to be mobile first, use a new class name .navbar-expandinstead of .navbar-toggleable, remove toggler position modifiers (relies on flex utils now), and fix a handful of bugs. Stabilize some grid behaviors and update the docs. Updated the grid to drop push, pull, and offset in favor of new .order- modifiers and margin utilities. Renamed tons of variables (see #22414 and #22092) for a more consistent naming scheme. Removed remaining cursor: pointers to restore browser defaults and better indicate actions vs hyperlinks. Renamed flexbox order utilities to better match utility naming scheme of .property-value. Restored Alpha 5's placement of _custom.scss in our import order. Rewrote display and responsive utilities to de-dupe a bunch of functionality. Removed Gruntfile and docs from package manager builds. Overhauled our color system with new Sass maps, variables, classes, and component variants. Updated browser support to bring ranges up to more recent versions. Added a bash script for linting unused variables. Moved jQuery and Popper to peerDependencies as they're not requirements for every part of Bootstrap.
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