vuex知识学习笔记

https://vuex.vuejs.org/zh/#%E4%BB%80%E4%B9%88%E6%98%AF%E2%80%9C%E7%8A%B6%E6%80%81%E7%AE%A1%E7%90%86%E6%A8%A1%E5%BC%8F%E2%80%9D%EF%BC%9F