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@@ -0,0 +1,58 @@
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+<!DOCTYPE html>
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+<html lang="en">
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+
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+<head>
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+ <meta charset="UTF-8">
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+ <meta name="viewport" content="width=device-width, initial-scale=1.0">
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+ <title>Document</title>
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+</head>
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+
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+<body>
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+ <div id="app">
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+ <!-- v-for="(item,index) in xxx" :key="index"
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+ 如果循环中没有绑定key
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+ 1.列表再删除或者排序时 dom操作错乱
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+ 2.复选框中状态容易错位
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+ 3.组件状态更新不及时
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+ 4.性能变差
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+ -->
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+ <h1>{{msg}}</h1>
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+ <div v-for="(item,index) in list" :key="index">{{item.name}}--{{index}}</div>
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+ <br><br>
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+ <div v-for="(item,index) in num" :key="index">{{item}}--{{index}}</div>
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+ <br><br>
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+ <div v-for="(item,index) in str" :key="index">{{item}}--{{index}}</div>
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+ <br><br>
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+ <div v-for="(item,index) in obj" :key="index">{{item}}--{{index}}</div>
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+
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+ </div>
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+ <script src="./vue.js"></script>
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+ <script>
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+ var app = new Vue({
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+ el: "#app",
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+ data: {
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+ msg: "你好啊",
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+ num: 10,
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+ str: "hello",
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+ obj: {
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+ name: '图图',
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+ age: 3
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+ },
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+ list: [
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+ {
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+ name: '图图',
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+ age: 3
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+ }, {
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+ name: 'Lucy',
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+ age: 13
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+ }, {
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+ name: 'Tom',
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+ age: 23
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+ }
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+ ]
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+ }
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+ })
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+ </script>
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+</body>
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+
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+</html>
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zheng