bootstrap導航欄沒有顯示正確

我已經開始bootstrap最近和trytrong文本做一個導航欄不起作用。所以我看了John Doe的視頻，並下載了它在那裏工作的源代碼！比我橫向複製和粘貼他的導航欄，它並沒有在我的工作。bootstrap導航欄沒有顯示正確

<!DOCTYPE html> 
 
<html lang="en"> 
 
    <head> 
 
    <meta charset="UTF-8"> 
 
    <meta name="viewport" content="width=device-width, initial-scale=1.0"> 
 
    <meta http-equiv="X-UA-Compatible" content="ie=edge"> 
 
    <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-beta.2/css/bootstrap.min.css" integrity="sha384-PsH8R72JQ3SOdhVi3uxftmaW6Vc51MKb0q5P2rRUpPvrszuE4W1povHYgTpBfshb" crossorigin="anonymous"> 
 
    <title>Form</title> 
 
    </head> 
 
    <body> 
 
    <nav class="navbar navbar-inverse"> 
 
     <div class="container"> 
 
     <div class="navbar-header"> 
 
      <button type="button" class="navbar-toggle collapsed" data-toggle="collapse" data-target="#bs-example-navbar-collapse-1" aria-expanded="false"> 
 
      <span class="sr-only">Toggle navigation</span> 
 
      <span class="icon-bar"></span> 
 
      <span class="icon-bar"></span> 
 
      <span class="icon-bar"></span> 
 
      </button> 
 
      <a class="navbar-brand" href="#">Form</a> 
 
     </div> 
 
     <div class="collapse navbar-collapse" id="bs-example-navbar-collapse-1"> 
 
      <ul class="nav navbar-nav"> 
 
      <li class="active"><a href="#">Nav <span class="sr-only">(current)</span></a></li> 
 
      <li><a href="#">Random</a></li> 
 
      <li class="dropdown"> 
 
       <a href="#" class="dropdown-toggle" data-toggle="dropdown" role="button" aria-haspopup="true" aria-expanded="false">Dropdown <span class="caret"></span></a> 
 
       <ul class="dropdown-menu"> 
 
       <li><a href="#">Action</a></li> 
 
       <li><a href="#">Another action</a></li> 
 
       <li><a href="#">Something else here</a></li> 
 
       <li role="separator" class="divider"></li> 
 
       <li><a href="#">Separated link</a></li> 
 
       <li role="separator" class="divider"></li> 
 
       <li><a href="#">One more separated link</a></li> 
 
       </ul> 
 
      </li> 
 
      </ul> 
 
     </div> 
 
     </div> 
 
    </nav> 
 
    <!-- JS --> 
 
    <script src="https://code.jquery.com/jquery-3.2.1.slim.min.js" integrity="sha384-KJ3o2DKtIkvYIK3UENzmM7KCkRr/rE9/Qpg6aAZGJwFDMVNA/GpGFF93hXpG5KkN" crossorigin="anonymous"></script> 
 
    <script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.12.3/umd/popper.min.js" integrity="sha384-vFJXuSJphROIrBnz7yo7oB41mKfc8JzQZiCq4NCceLEaO4IHwicKwpJf9c9IpFgh" crossorigin="anonymous"></script> 
 
    <script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-beta.2/js/bootstrap.min.js" integrity="sha384-alpBpkh1PFOepccYVYDB4do5UnbKysX5WZXm3XxPqe5iKTfUKjNkCk9SaVuEZflJ" crossorigin="anonymous"></script> 
 
    </body> 
 
</html>

電流輸出：

來源

2017-11-11 Robin Dieu

-1

這是錯誤的版本。試用

<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css">

來源

2017-11-11 16:11:07 Sun

完美，謝謝！ –

歡迎您！請標記這個答案。 – Sun

bootstrap導航欄沒有顯示正確

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