flex属性
flex属性决定你的弹性盒子怎么排列
缩放:
flex为:flex-grow,flex-shrink,flex-basis属性的集合
https://blog.csdn.net/aliven1/article/details/78853725
方向:
flex-direction四个常用值:row,row-reverse,column,column-reverse,分别为横排,横着倒排,竖排,竖着倒排
换行:
flex-wrap: nowrap|wrap|wrap-reverse|initial|inherit;
放在哪个位置:
justify-content: flex-start|flex-end|center|space-between|space-around|initial|inherit;