代码语言:txt 复制 import React, { useState } from 'react'; const App = () => { const [showComponent, setShowComponent] = useState(false); const handleClick = () => { setShowComponent(!showComponent); }; return ( 点击渲染特定组件 {showComponent && <SpecialComponent />} ); ...
import React, { useState } from 'react'; function App() { const [showComponent, setShowComponent] = useState(false); const handleClick = () => { setShowComponent(true); }; return ( 点击显示组件 {showComponent && <Component />} ); } function Component() { return 这是一个组件; ...
render() {return(ES6方式创建的组件); } } exportdefaultMyComponent; 也可以将绑定方法写到constructor中: import React,{ Component } from 'react'; class MyComponent extends Component { constructor(props) { super(props);this.handleClick =this.handleClick.bind(this); } handleClick() { console.log...
toggleTip = shouldShowTip => () =>{this.setState({ shouldShowTip: shouldShowTip }) }
function MyButton() { const [count, setCount] = useState(0); function handleClick() { setCount(count + 1); } return ( Clicked {count} times ); } React will call your component function again. This time, count will be 1. Then it will be 2. And so on. If you render the sa...
class App extends React.Component {//设置一个ref的容器oIpt = React.createRef();render() {console.log(this);return (点我弹出input中输入的内容);}showMsg = () => {alert(this.oIpt.current.value);};}const root = ReactDOM.createRoot(document.getElementById("app"));root.render(<App />...
Infinite Scroll Component，首先需要安装这个库：npm install react-infinite-scroll-component# 或者yarn add react-infinite-scroll-component接下来，你可以在组件中这样使用它：import React, { useState, useEffect } from'react';import InfiniteScroll from'react-infinite-scroll-component';functionApp() {const [...
exportdefaultclassBindEventextendsReact.Component{ constructor(){ super() this.state={} } render(){ return BindEvent组件 {this.show('wdg')}}>按钮 } btnClickFunc(){ console.log("22222222222"); } show(name){ console.log(name) } } 1. 2. 3. 4. 5. ...
在Text组件上我们可以绑定点击事件onPress class MyBodyText extends Component{ onClick = ()=>{} render() { return ( <Text onPress={this.onClick}> {this.props.children} </Text> ) } } Image 在深入学习RN样式布局我们已经介绍了Image组件通过source属性来加载本地图片或者网络,这里不再赘述了。
export default class EightteenChildOne extends React.Component { static propTypes = { //propTypes校验传入类型,详情在技巧11 name: PropTypes.string }; click = () => { // 通过触发方法子传父 this.props.eightteenChildOneToFather("这是 props 改变父元素的值"); ...