Bootstrap CSS glyphicon不显示我该怎么办？

问题描述

因此，如果您仔细阅读这段代码，我在密码和电子邮件条目输入选项卡旁边使用了一个锁和用户glyphicon，但它似乎不起作用。我一直在尝试从YouTube视频中获取此代码，并且其他所有功能都可以正常运行-只是glyphicon不起作用，即，它根本不显示，但也没有任何错误。可能是什么问题？（P.S.我使用的是Mac，以防可能影响此效果）

 <div class = "container">
            <div class = "row">
                <div class = "col-md-5">
                    <h1 class = "text-center">Log-in form</h1>
                    <label class = "label control - label"> User E-mail</label>
                    <div class = "input-group">
                        <span class = "input-group-addon"><span class = "glyphicon glyphicon-user"></span></span>
                        <input type = "text" class = "form-control" name = "mail" placeholder="E-mail">
                    </div>
                    <label class = "label control - label"> User Password</label>
                    <div class = "input-group">
                        <span class = "input-group-addon"><span class = "glyphicon glyphicon-lock"></span></span>
                        <input type = "password" class = "form-control" name = "pass" placeholder="Password">
                    </div>
                    <div class = "row">
                        <div class = "col-md-6">
                            <input type = "checkBox"> <small>Remember me</small>
  

              </div>
                <div class = "col-md-6"> 
                    <a href = "#"><p class = "text-right">Forgot Password?</p> </a>
                </div>
            </div>
            <a href = "#"><div class = "btn btn-default">LOG IN</div></a>
            <p class = "text-center">Not a member yet? <a href = "#">Sign up</a></p>
        </div>
        <div class = "col-md-2"></div>
        <div class = "col-md-5"></div>
    </div>
</div>

解决方法

暂无找到可以解决该程序问题的有效方法，小编努力寻找整理中！

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glyphicons html twitter-bootstrap