<span class="icon-bar"></span> 不显示?

<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
    <meta charset="utf-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>@ViewBag.Title - 我的 ASP.NET 应用程序</title>
    @Styles.Render("~/Content/css")
    @Scripts.Render("~/bundles/modernizr")
</head>
<body>
    <div class="navbar navbar-inverse navbar-fixed-top">    
        <div class="container">
            <div class="navbar-header"><button type="button" class="navbar-toggle" data-toggle="collapse" data-target=".navbar-collapse">
            
<span class="icon-bar"></span>
            
<span class="icon-bar"></span>
            
<span class="icon-bar"></span>
</button> @Html.ActionLink("应用程序名称", "Index", "Home", new { area = "" }, new { @class = "navbar-brand" }) </div> <div class="navbar-collapse collapse"> <ul class="nav navbar-nav"> <li>@Html.ActionLink("主页", "Index", "Home")</li> <li>@Html.ActionLink("关于", "About", "Home")</li> <li>@Html.ActionLink("联系方式", "Contact", "Home")</li> </ul> </div> </div> </div> <div class="container body-content"> @RenderBody() <hr /> <footer> <p>&copy; @DateTime.Now.Year - 我的 ASP.NET 应用程序</p> </footer> </div> @Scripts.Render("~/bundles/jquery") @Scripts.Render("~/bundles/bootstrap") @RenderSection("scripts", required: false) </body> </html>

为什么这个三横杠不显示 ?

原文地址:https://www.cnblogs.com/wfy680/p/15127117.html