lovecoding
/
W0407


			
				
					
						
						
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							<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>

<body>
    <div id="app">
        <!-- v-for="(item,index) in xxx" :key="index"
            如果循环中没有绑定key
            1.列表再删除或者排序时 dom操作错乱
            2.复选框中状态容易错位
            3.组件状态更新不及时
            4.性能变差 
        -->
        <h1>{{msg}}</h1>
        <div v-for="(item,index) in list" :key="index">{{item.name}}--{{index}}</div>
        <br><br>
        <div v-for="(item,index) in num" :key="index">{{item}}--{{index}}</div>
        <br><br>
        <div v-for="(item,index) in str" :key="index">{{item}}--{{index}}</div>
        <br><br>
        <div v-for="(item,index) in obj" :key="index">{{item}}--{{index}}</div>

    </div>
    <script src="./vue.js"></script>
    <script>
        var app = new Vue({
            el: "#app",
            data: {
                msg: "你好啊",
                num: 10,
                str: "hello",
                obj: {
                    name: '图图',
                    age: 3
                },
                list: [
                    {
                        name: '图图',
                        age: 3
                    }, {
                        name: 'Lucy',
                        age: 13
                    }, {
                        name: 'Tom',
                        age: 23
                    }
                ]
            }
        })
    </script>
</body>

</html>