lovecoding
/
VIP29


			
				
					
						
						
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							<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>模板</title>
    <!-- 引入文件   -->
    <script src="https://unpkg.com/vue@3/dist/vue.global.js"></script>
    <style>
        .active {
            height: 200px;
            width: 200px;
            border: 1px solid red;
        }
    </style>
</head>
<body>
<div id="app">
    <div :class="{ active: isActive }">456</div>

    <!--<div class="active"> 123 </div>-->
    <button @click="isActive = !isActive">切换</button>
</div>
</body>
<script>
    const { createApp, ref } = Vue;
    createApp({
        setup() {
            //响应
            const isActive = ref(true)

            return {
                isActive
            };
        }
    }).mount('#app'); //createApp创建对象 挂在到app
</script>
</html>