JSFiddle - React, Tailwind, and code Playground

HTML

<!doctype html>
<html lang="ru">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Урок 1</title>
    <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css" integrity="sha384-BVYiiSIFeK1dGmJRAkycuHAHRg32OmUcww7on3RYdg4Va+PmSTsz/K68vbdEjh4u" crossorigin="anonymous">
    <script src="https://cdn.jsdelivr.net/npm/vue"></script>
</head>
<body>
    <hr>
    <div class="container">
        <div class="sample">
            <button class="btn btn-primary" 
                    v-on:click="showH2 = !showH2"
                    v-bind:title="showH2 ? 'Hide' : 'Show'"
                    >
                Toggle header
            </button>
            <hr>
            <h2 v-show="showH2">Hello, World!</h2>
            <hr>
            <button class="btn btn-success" 
                    v-on:click="numbers.push(Math.random())"
                    >
                Add number
            </button>
            <hr>
            <ul class="list-group">
                <li class="list-group-item"
                    v-for="number in numbers"
                >
                    {{ number }}
                </li>
            </ul>
        </div>
         <hr>
        <div>
          <a href="http://js.dmitrylavrik.ru/vue/" target="_blank">Курс по Vue.js</a>
        </div>
    </div>
</body>
</html>

JavaScript

let sample = new Vue({
    el: '.sample',
    data: {
        showH2: true,
        numbers: []
    }
});