React 是一个用于构建用户界面（UI）的 JavaScript 库，用户界面由按钮、文本和图像等小单元内容构建而成。React 帮助你把它们组合成可重用、可嵌套的组件。从 web 端网站到移动端应用，屏幕上的所有内容都可以被分解成组件。在本章节中，你将学习如何创建、定制以及有条件地显示 React 组件。

第一个组件

了不起的科学家

TodoList

Hedy Lamarr's Todos

Invent new traffic lights
Rehearse a movie scene
Improve spectrum technology

将 Props 传递给组件

条件渲染

Sally Ride's Packing List

Space Suit ✅
Helmet with a Golden Leaf ✅
Photo of Tam ❌

渲染列表

科学家

Creola Katherine Johnson mathematician known for spaceflight calculations
Mario José Molina-Pasquel Henríquez chemist known for discovery of Arctic ozone hole
Mohammad Abdus Salam physicist known for electromagnetism theory
Percy Lavon Julian chemist known for pioneering cortisone drugs, steroids and birth control pills
Subrahmanyan Chandrasekhar astrophysicist known for white dwarf star mass calculations