<!DOCTYPE html>
<html>
    <head>
        <meta charset="utf-8">
        <meta name="viewport" content="width=device-width, initial-scale=1">
        <link rel="stylesheet" href="https://cdn.staticfile.org/twitter-bootstrap/3.3.7/css/bootstrap.min.css">
    </head>

    <body>
        <div class="container">
            <h2>Heart Glyph</h2>
            <p>Heart icon: <span class="glyphicon glyphicon-heart"></span></p>    
            <p>Heart icon as a link:
                <a href="#">
                    <span class="glyphicon glyphicon-heart"></span>
                </a>
            </p>
            <p>Heart icon on a button:
                <button type="button" class="btn btn-default btn-sm">
                    <span class="glyphicon glyphicon-heart"></span> Heart
                </button>
            </p>
            <p>Heart icon on a styled link button:
                <a href="#" class="btn btn-info btn-lg">
                    <span class="glyphicon glyphicon-heart"></span> Heart
                </a>
            </p> 
        </div>

        <script src="https://cdn.staticfile.org/jquery/2.1.1/jquery.min.js"></script>
        <script src="https://cdn.staticfile.org/twitter-bootstrap/3.3.7/js/bootstrap.min.js"></script>
    </body>

</html>

吴裕雄 Bootstrap 前端框架开发——Bootstrap 字体图标(Glyphicons)：glyphicon glyphicon-heart_html