weui-flex这个css不存在

[lmguo]

**Do you want to request a feature or report a bug (建议还是bug) ?BUG

**What is the current behavior? (现有状况)weiui-flex css不存在

What is the expected behavior? （应有状况）

Which versions of React-weui, weui, and which OS and device are affected by this issue? (React-weui版本 weui版本 机型和系统)