北京时间2017年8月12日，Bootstrap 4 的首个 Beta 版终于发布了。此次Beta版本距离上次发布 4.0 的最后一个 alpha 版已经过去了 7 个月。

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.

点此查看完整的更新说明。

下载地址

• bootstrap-4.0.0-beta-dist.zip 265KB
• Source code (zip)
• Source code (tar.gz)

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