这里暂时不是入门教学，是flex知识收集
兼容性
display: flex;
display: -webkit-flex;
其余新属性前面加-webkit-
Flex属性(the first value is the default one of the property)
direction:ltr/rtl //the flex line
flex-direction:flex-start/flex-end/center/space-between/space-around //the main axis
align-items:flex-start/flex-end/center/baseline/stretch //the cross axis
flex-wrap:nowrap/wrap/wrap-reverse
align-content:stretch/flex-start/flex-end/center/space-between/space-around
flex-flow: [flex-direction] [flex-wrap]
Flex Item属性
order:0
margin:auto
align-self:stretch/flex-start/flex-end/center/baseline //overrides Flex Container‘s align-items
flex: 0 1 auto/[Number]/initial/auto/none //不要用，除非把flex-basis部分设置auto，否则在ie里，box-sizing强制变content box
flex: [flex-grow] [flex-shrink] [flex-basis]
flex-basis:auto/[width]
flex-grow:0
flex-shrink:1