FLEX justify-content 属性项目在主轴上的对齐方式
1,justify-content: flex-start
2,justify-content: flex-end
3,justify-content: center
4,justify-content: space-between
5,justify-content: space-around
标签：FLEX,主轴,space,content,对齐,justify From： https://www.cnblogs.com/96net/p/16609563.html