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  • React--JSX语法

    粗浅的理解是把要展现的东西一股脑写道render{}里面就好,然后在页面指定的div内渲染出来。

    <!DOCTYPE html>
    <html lang="en">
    <head>
        <meta charset="UTF-8">
        <meta name="viewport" content="width=device-width, initial-scale=1.0">
        <meta http-equiv="X-UA-Compatible" content="ie=edge">
        <title>Document</title>
        <script src="./js/react.js"></script>
        <script src="./js/react-dom.js"></script>
        <script src="./js/browser.min.js"></script>
    </head>
    <body>
        <div id="example"></div>
    
        <script type="text/babel">
        var arr = [
            <h1 key="1">Hello world!</h1>,
            <h2 key="2">React is awesome</h2>,
          ];
    
        ReactDOM.render(
            <div>{arr}</div>,
            document.getElementById('example')
        )
    
         </script>
    </body>
    </html>
    
    <!DOCTYPE html>
    <html>
    
    <head>
        <script src="./js/react.js"></script>
        <script src="./js/react-dom.js"></script>
        <script src="./js/browser.min.js"></script>
    </head>
    
    <body>
        <div id="example"></div>
    
        <script type="text/babel">
            var names = ['andy','bob','kate'];
        
            ReactDOM.render(
                <div>
                    { 
                        names.map(function (name) { 
                            return <div>hello,{name}! </div>
                        }) 
                    }
                </div>,
    
                document.getElementById('example') 
            )
        </script>
    </body>
    
    </html>
    
    <!-- 顺便复习一下ES6的 Map 结构
    var names = ['andy','bob','kate'];
    names.map(function(name){
    	return {name};
    }) -->
    
    

    顺带复习一下es6中map:

    es6的Map结构用来表示键值对的集合,和js的Object的区别在于:

    object只能用字符串做键名,但是Map是可以包括各类值的 比如
    let map = new map{}
    map.set(NaN,123);
    map.get(+0)  // 123
    
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  • 原文地址:https://www.cnblogs.com/n2meetu/p/8804977.html
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