接上篇，还是笔记，还是干货。
深入 JSX
如果使用 JSX 表达式 ，Foo 必须在范围内，因为这些标签被编译为对指定变量的直接引用。
由于 JSX 编译为对 React.createElement() 的调用，因此 React 库必须始终在 JSX 代码的作用域中。
可以使用 JSX 中的点表示法来引用 React 组件。如果有一个模块导出很多 React 组件，这很方便。
用户定义的组件必须以大写开头。
当构建通用容器时，扩展属性可能很有用。然而，扩展属性很容易将大量不相关的属性传递给不关心它们的组件。建议谨慎使用扩展属性。
在包含开始标记和结束标记的 JSX 表达式中，这些标记之间的内容作为特殊的属性 this.props.children 传递。
React 组件不能返回多个 React 元素，但是一个 JSX 表达式可以有多个子元素。因此，如果想要一个组件呈现多个元素，可以将它包装在 div 中。
传递给自定义组件的子项可以是任何东西，只要该组件将它们转换为 React 在渲染之前可以理解的东西即可。
一些“假”值，仍然会被 React 渲染。
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