JSX中绑定属性

在JSX中只要看到 {} 就会当做JS来解析(执行里面的JS代码)，所以无论是绑定属性, 还是绑定类名, 还是绑定样式, 只需要将字符串改为 {} 然后再通过JS动态获取, 动态绑定即可，对于普通属性而言, 过去怎么绑定, 现在就怎么绑定，以下将会给出一些案例，和测试的效果图，如下所示。

绑定普通属性

<p title="我是标题">我是段落</p>

<p title={message}>我是段落</p>

<!doctype html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport"
          content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <script src="./react.development.v17.js"></script>
    <script src="./react-dom.development.v17.js"></script>
    <script src="./babel.min.js"></script>
</head>
<body>
<div id="app"></div>
<script type="text/babel">
    class Home extends React.Component {
        constructor() {
            super();
            this.state = {
                message: 'BNTang'
            }
        }

        render() {
            return (
                <div>
                    <p id="box">{this.state.message}</p>
                    <p title={this.state.message}>{this.state.message}</p>
                </div>
            )
        }
    }

    ReactDOM.render(<Home/>, document.getElementById('app'));
</script>
</body>
</html>

绑定类名 (class)

由于JSX本质是转换成JS代码, 而在JS中 class 有特殊含义, 所以不能使用，同理可证, 但凡是属性名称是JS关键字的都不能直接使用。

<!doctype html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport"
          content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <script src="./react.development.v17.js"></script>
    <script src="./react-dom.development.v17.js"></script>
    <script src="./babel.min.js"></script>
</head>
<body>
<div id="app"></div>
<script type="text/babel">
    class Home extends React.Component {
        constructor() {
            super();
            this.state = {
                message: 'BNTang'
            }
        }

        render() {
            return (
                <div>
                    <p className="active">{this.state.message}</p>
                </div>
            )
        }
    }

    ReactDOM.render(<Home/>, document.getElementById('app'));
</script>
</body>
</html>

绑定样式 (style)

由于样式是键值对形式的, 所以在JSX中如果想要动态绑定样式，必须将样式放到一个对象中, 并且所有以 - 连接的样式名称都要转换成驼峰命名的形式，

<p style={{color:'red', fontSize:'50px'}}>绑定样式</p>

<!doctype html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport"
          content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <script src="./react.development.v17.js"></script>
    <script src="./react-dom.development.v17.js"></script>
    <script src="./babel.min.js"></script>
</head>
<body>
<div id="app"></div>
<script type="text/babel">
    class Home extends React.Component {
        constructor() {
            super();
            this.state = {
                message: 'BNTang'
            }
        }

        render() {
            return (
                <div>
                    <p style={{color: 'red', fontSize: '100px'}}>{this.state.message}</p>
                </div>
            )
        }
    }

    ReactDOM.render(<Home/>, document.getElementById('app'));
</script>
</body>
</html>