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			Сообщение от yozuul
			
		
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		3. Есть такой код
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<!DOCTYPE html>
<html>
<head>
    <title>Untitled</title>
    <meta charset="utf-8">
    <style type="text/css">
        .item {
            border: 1px solid #008000;
            margin: 4px;
        }
        .active {
            border: 1px solid red;
        }
    </style>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/vue/2.5.17/vue.min.js"></script>
</head>
<body>
    <div id="app">
        <div v-for="item in items" :key="item.id" :class="[{ active: item.isActive },'item']">
            <button @click="item.isActive = !item.isActive">Клик</button>
        </div>
    </div>
    <script>
        const app = new Vue({
            el: "#app",
            data: {
                
                items: [{
                    id: 1,
                    isActive: false
                }, {
                    id: 2,
                    isActive: false
                }, {
                    id: 3,
                    isActive: false
                }]
            }
        });
    </script>
</body>
</html>