G：vue watch props change
https://stackoverflow.com/questions/44584292/vuejs-2-0-how-to-listen-for-props-changes
https://stackoverflow.com/questions/44584292/vuejs-2-0-how-to-listen-for-props-changes
數(shù)組監(jiān)聽變化
https://segmentfault.com/q/1010000008079455
對(duì)象監(jiān)聽變化
https://www.zhihu.com/question/39155535
image.png
https://cn.vuejs.org/v2/api/#vm-watch
