react state的简写形式

geekymv 发表于:2024-08-19 22:19:00 阅读数:363

<div id="test"></div>

        <script src="https://unpkg.com/react@16/umd/react.development.js"></script>
        <script src="https://unpkg.com/react-dom@16/umd/react-dom.development.js"></script>

        <!-- 引入 babel, 用于将 jsx 转为 js -->
        <!-- Don't use this in production: -->
        <script src="https://unpkg.com/@babel/standalone/babel.min.js"></script>

        <!-- 此处一定要写 babel -->
        <script type="text/babel">
            class Weather extends React.Component {
                // 初始化状态
                state = {isHot: false}

                render() {
                    return <h2 onClick={this.changeWeather}>今天天气{this.state.isHot ? '很热' : '很冷'}</h2>
                }

                // 自定义方法,要用赋值语句的形式 + 箭头函数(日常开发中常使用这种方式)
                changeWeather = () => {
                    const isHot = this.state.isHot
                    this.setState({isHot: !isHot})
                }
            }

            ReactDOM.render(<Weather/>, document.getElementById('test'))

        </script>


Barbara Middleton
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Sean Brown
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