处理：end value has mixed support, consider using flex-end instead

提示：end value has mixed support, consider using flex-end instead
经检查，没有规范的写flex的属性，正确的写法是 flex-end 或 flex-start

错误的写法

align-items：end;

正确写法是

align-items：flex-end;

如出现：start value has mixed support, consider using flex-start instead
也是同样的问题，要使用flex-start 而不是start