learningVueJS/4.class-binding.html at master · tushargugnani/learningVueJS · GitHub

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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>
    <!-- development version, includes helpful console warnings -->
    <script src="https://cdn.jsdelivr.net/npm/vue/dist/vue.js"></script>
    <style>
        .active{
            color: green;
        }
        .notActive{
            color: red;
        }
    </style>
</head>
<body>
    <div id="app">
        <h3 v-bind:class="{active : isActive}">This is a sample text</h3>

        <h3 v-bind:class="[isActive ? 'active' : 'notActive']">This is a sample text</h3>
    </div>
</body>
<script type="text/javascript">
    var app = new Vue({
        el: '#app',
        data: {
            isActive : true,
        }
    });
</script>
</html>