React不存在 子component向父component溝通的專門機制
Synopsis
原理: 1. 呼叫setState 觸發的re-render的component 是固定的。 不管setState在哪裡（上面這句結論很重要要直接印在腦海） 2.
![[React新手指南] 11 让组件更灵活1 父子数据传递｜网站开发技术教程 HTML CSS JavaScript React Threejs vite](https://i.ytimg.com/vi/dtF0ESbiHEU/hq720.jpg?sqp=-oaymwEcCNAFEJQDSFXyq4qpAw4IARUAAIhCGAFwAcABBg==&rs=AOn4CLAQcg74ZG03p0_j03fmL8nkR-rpBA)
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