Bootstrap禁用下拉项

<!DOCTYPE html>
<html>
   <head>
      <title>Bootstrap Example</title>
      <link href = /bootstrap/css/bootstrap.min.css rel = stylesheet>
      <script src = /scripts/jquery.min.js></script>
      <script src = /bootstrap/js/bootstrap.min.js></script>
   </head>
   <body>
      <div class = container>
         <h2>Beverages</h2>
         <p>The following are the beverages available in India:</p>
         <div class = dropdown>
            <button class = btn btn-primary dropdown-toggle type = button data-toggle=dropdown>Beverages
            <span class=caret></span></button>
            <ul class = dropdown-menu>
               <li><a href = #>Gatorade</a></li>
               <li class = disabled><a href = #>Sting</a></li>
               <li><a href = #>Red Bull</a></li>
               <li><a href = #>Pepsi</a></li>
               <li><a href = #>Coca Cola</a></li>
            </ul>
         </div>
      </div>
   </body>
</html>

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