---
title: Props
localeTitle: 道具
---
## React Native - 道具
术语props是“属性”的缩写，表示从一个组件传递到另一个组件的某种类型的数据。道具总是从父组件向下流向子组件。
在React中，子组件可以通过props访问父级的信息：
```jsx
// the child Header component receives the text prop and can access it via this.props.text
class Header extends Component {
render () {
return (
{this.props.text}
)
}
}
class App extends Component {
render () {
return (
);
}
}
```
这在功能组件中的工作方式也相同：
```jsx
// in functional components, props will be received as a parameter 'props'
const Header = (props) => {
return (
{props.title}
);
};
class App extends Component {
render () {
return (
);
}
}
```
您导入的其他库还可以访问组件中的其他属性。以下是来自[react-native-elements](https://github.com/react-native-training/react-native-elements)库的示例。
```jsx
import { Button } from 'react-native-elements';
// here 'buttonStyle' and 'title' are props passed into the Button component
class App extends Component {
render () {
return (
);
}
}
```