68 lines
1.5 KiB
Markdown
68 lines
1.5 KiB
Markdown
---
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title: Props
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localeTitle: 道具
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---
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## React Native - 道具
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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。
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在React中，子组件可以通过props访问父级的信息：
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```jsx
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// the child Header component receives the text prop and can access it via this.props.text
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class Header extends Component {
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render () {
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return (
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<Text>{this.props.text}</Text>
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)
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}
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}
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class App extends Component {
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render () {
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return (
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<Header text="Welcome!" />
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);
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}
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}
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```
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这在功能组件中的工作方式也相同：
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```jsx
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// in functional components, props will be received as a parameter 'props'
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const Header = (props) => {
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return (
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<Text>{props.title}</Text>
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);
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};
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class App extends Component {
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render () {
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return (
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<View>
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<Header text="Welcome!" />
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</View>
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);
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}
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}
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```
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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。
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```jsx
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import { Button } from 'react-native-elements';
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// here 'buttonStyle' and 'title' are props passed into the Button component
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class App extends Component {
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render () {
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return (
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<Button
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buttonStyle={{backgroundColor: 'red', borderRadius: 10}}
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title={`Submit`}
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/>
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);
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}
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}
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``` |