React - 组件和 props
定义组件可以写函数或者创建 class
function Welcome(props) {
return <h1>Hello, {props.name}</h1>;
}
该函数是一个有效的 React 组件，因为它接收唯一带有数据的 “props”（代表属性）对象与并返回一个 React 元素。这类组件被称为“函数组件”，因为它本质上就是 JavaScript 函数。
class Welcome extends React.Component {
render() {
return <h1>Hello, {this.props.name}</h1>;
}
}
上述两个是等价的。
自定义组件必须开头大写。
所有 React 组件都必须像纯函数一样保护它们的 props 不被修改。
Dec 28, 2022 03:52:06 PM
In React, every user interface is created using small, reusable pieces called components. Every React component has two parts: props and state. props are immutable and are passed to the component by the parent component. state is mutable and is managed within the component itself. diamond rings When a component's state changes, the component will re-render itself.
Jan 09, 2024 02:29:16 PM
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