Glyphicons Bootstrap4

Question

Glyphicons在以下代码中不起作用。请检查并回答为什么它不起作用。

<div class="navbar navbar-expand-sm navbar-light bg-secondary">
    <div class="container">
            <div class="navbar-header">
            <a href="home.html" class="navbar-brand">
                 <img src="a.jpg" width="30" height="30" class="d-inline-block align-top brand" alt="">
                Portfolio
             </a>
            </div>
            <button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navtarget">
               <span class="navbar-toggler-icon"></span>
            </button>
            <div class="collapse navbar-collapse" id="navtarget">
                <ul class="navbar-nav">
                    <li class="nav-item"><a href = "#" class="nav-link"><span class ="glyphicon glyphicon-picture"  aria-hidden="true"></span> Products </a></li>
                    <li class="nav-item"><a href = "#" class="nav-link"><span class ="glyphicon glyphicon-pencil"  aria-hidden="true"></span> Feedback </a></li>
                    <li class="nav-item"><a href = "#" class="nav-link"><span class ="glyphicon glyphicon-user"  aria-hidden="true"></span> Profile </a></li>
                    <li class="nav-item"><a href="#" class="nav-link"><span class="glyphicon glyphicon-earphone"  aria-hidden="true"></span> Contact Us</a></li>
                </ul>
            </div>
        </div>
    </div>

Answer 1

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