button单选和多选的实现逻辑，主要是index和事件对游标的改变，还有分步表单的实现，过滤器的适用场景

https://juejin.cn/post/6844903665447206926

https://p1-jj.byteimg.com/tos-cn-i-t2oaga2asx/gold-user-assets/2018/8/27/165796fd4730432b~tplv-t2oaga2asx-watermark.awebp

按钮的多选和单选
https://blog.csdn.net/qq_33492197/article/details/116520507

不使用radio也可以进行单选
https://segmentfault.com/a/1190000016313367

分步表单

https://blog.csdn.net/bbxylqf126com/article/details/114951576

过滤器的适用场景

http://www.javanx.cn/20181116/vue-filter/