我希望这可以正常工作。可运行的代码：
<!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">
<title>Text editor</title>
<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.1.1/css/bootstrap.min.css">
<script src="https://code.jquery.com/jquery-3.3.1.slim.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.3/umd/popper.min.js"></script>
<script src="https://stackpath.bootstrapcdn.com/bootstrap/4.1.1/js/bootstrap.min.js"></script>
</head>
<body>
<!-- Button trigger modal -->
<button class="btn btn-primary btn-lg" href="#signin" data-toggle="modal" data-target="#myModal">Sign In/Register</button>
<!-- Modal -->
<div class="modal fade bs-modal-sm" id="myModal" tabindex="-1" role="dialog" aria-labelledby="mySmallModalLabel" aria-hidden="true">
<div class="modal-dialog modal-sm">
<div class="modal-content">
<br>
<ul id="myTab" class="nav nav-tabs">
<li class="nav-item"><a class="nav-link active" href="#signin" data-toggle="tab">Sign In</a></li>
<li class="nav-item"><a class="nav-link" href="#signup" data-toggle="tab">Register</a></li>
<li class="nav-item"><a class="nav-link" href="#why" data-toggle="tab">Why?</a></li>
</ul>
<div class="modal-body">
<div id="myTabContent" class="tab-content">
<div class="tab-pane fade in" id="why">
<p>We need this information so that you can receive access to the site and its content. Rest assured your information will not be sold, traded, or given to anyone.</p>
<p>
<br> Please contact <a mailto:href="JoeSixPack@Sixpacksrus.com">JoeSixPack@Sixpacksrus.com for any other inquiries.</a></p>
</div>
<div class="tab-pane fade in active" id="signin">
<form class="form-horizontal">
<fieldset>
<!-- Sign In Form -->
<!-- Text input-->
<div class="control-group">
<label class="control-label" for="userid">Alias:</label>
<div class="controls">
<input required="" id="userid" name="userid" type="text" class="form-control" placeholder="JoeSixpack" class="input-medium" required="">
</div>
</div>
<!-- Password input-->
<div class="control-group">
<label class="control-label" for="passwordinput">Password:</label>
<div class="controls">
<input required="" id="passwordinput" name="passwordinput" class="form-control" type="password" placeholder="********" class="input-medium">
</div>
</div>
<!-- Multiple Checkboxes (inline) -->
<div class="control-group">
<label class="control-label" for="rememberme"></label>
<div class="controls">
<label class="checkbox inline" for="rememberme-0">
<input type="checkbox" name="rememberme" id="rememberme-0" value="Remember me">
Remember me
</label>
</div>
</div>
<!-- Button -->
<div class="control-group">
<label class="control-label" for="signin"></label>
<div class="controls">
<button id="signin" name="signin" class="btn btn-success">Sign In</button>
</div>
</div>
</fieldset>
</form>
</div>
<div class="tab-pane fade" id="signup">
<form class="form-horizontal">
<fieldset>
<!-- Sign Up Form -->
<!-- Text input-->
<div class="control-group">
<label class="control-label" for="Email">Email:</label>
<div class="controls">
<input id="Email" name="Email" class="form-control" type="text" placeholder="JoeSixpack@sixpacksrus.com" class="input-large" required="">
</div>
</div>
<!-- Text input-->
<div class="control-group">
<label class="control-label" for="userid">Alias:</label>
<div class="controls">
<input id="userid" name="userid" class="form-control" type="text" placeholder="JoeSixpack" class="input-large" required="">
</div>
</div>
<!-- Password input-->
<div class="control-group">
<label class="control-label" for="password">Password:</label>
<div class="controls">
<input id="password" name="password" class="form-control" type="password" placeholder="********" class="input-large" required="">
<em>1-8 Characters</em>
</div>
</div>
<!-- Text input-->
<div class="control-group">
<label class="control-label" for="reenterpassword">Re-Enter Password:</label>
<div class="controls">
<input id="reenterpassword" class="form-control" name="reenterpassword" type="password" placeholder="********" class="input-large" required="">
</div>
</div>
<!-- Multiple Radios (inline) -->
<br>
<div class="control-group">
<label class="control-label" for="humancheck">Humanity Check:</label>
<div class="controls">
<label class="radio inline" for="humancheck-0">
<input type="radio" name="humancheck" id="humancheck-0" value="robot" checked="checked">I'm a Robot</label>
<label class="radio inline" for="humancheck-1">
<input type="radio" name="humancheck" id="humancheck-1" value="human">I'm Human</label>
</div>
</div>
<!-- Button -->
<div class="control-group">
<label class="control-label" for="confirmsignup"></label>
<div class="controls">
<button id="confirmsignup" name="confirmsignup" class="btn btn-success">Sign Up</button>
</div>
</div>
</fieldset>
</form>
</div>
</div>
</div>
<div class="modal-footer">
<center>
<button type="button" class="btn btn-default" data-dismiss="modal">Close</button>
</center>
</div>
</div>
</div>
</div>
</body>
</html>
您可以看到它正在加载选项卡窗格，因为如果将鼠标悬停在模式区域上，则可以看到光标在未显示的不可见输入框上变化。另外，您可以单击其他选项卡，然后就可以返回第一个选项卡了。这是怎么回事？
帮助？
答案 0 :(得分：1)
fade会导致您的问题，只需将fade中的tabpane删除，它应该可以正常工作。
<!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">
<title>Text editor</title>
<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.1.1/css/bootstrap.min.css">
<script src="https://code.jquery.com/jquery-3.3.1.slim.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.3/umd/popper.min.js"></script>
<script src="https://stackpath.bootstrapcdn.com/bootstrap/4.1.1/js/bootstrap.min.js"></script>
</head>
<body>
<!-- Button trigger modal -->
<button class="btn btn-primary btn-lg" href="#signin" data-toggle="modal" data-target="#myModal">Sign In/Register</button>
<!-- Modal -->
<div class="modal fade bs-modal-sm" id="myModal" tabindex="-1" role="dialog" aria-labelledby="mySmallModalLabel" aria-hidden="true">
<div class="modal-dialog modal-sm">
<div class="modal-content">
<br>
<ul id="myTab" class="nav nav-tabs">
<li class="nav-item"><a class="nav-link active" href="#signin" data-toggle="tab">Sign In</a></li>
<li class="nav-item"><a class="nav-link" href="#signup" data-toggle="tab">Register</a></li>
<li class="nav-item"><a class="nav-link" href="#why" data-toggle="tab">Why?</a></li>
</ul>
<div class="modal-body">
<div id="myTabContent" class="tab-content">
<div class="tab-pane " id="why">
<p>We need this information so that you can receive access to the site and its content. Rest assured your information will not be sold, traded, or given to anyone.</p>
<p>
<br> Please contact <a mailto:href="JoeSixPack@Sixpacksrus.com">JoeSixPack@Sixpacksrus.com for any other inquiries.</a></p>
</div>
<div class="tab-pane active" id="signin">
<form class="form-horizontal">
<fieldset>
<!-- Sign In Form -->
<!-- Text input-->
<div class="control-group">
<label class="control-label" for="userid">Alias:</label>
<div class="controls">
<input required="" id="userid" name="userid" type="text" class="form-control" placeholder="JoeSixpack" class="input-medium" required="">
</div>
</div>
<!-- Password input-->
<div class="control-group">
<label class="control-label" for="passwordinput">Password:</label>
<div class="controls">
<input required="" id="passwordinput" name="passwordinput" class="form-control" type="password" placeholder="********" class="input-medium">
</div>
</div>
<!-- Multiple Checkboxes (inline) -->
<div class="control-group">
<label class="control-label" for="rememberme"></label>
<div class="controls">
<label class="checkbox inline" for="rememberme-0">
<input type="checkbox" name="rememberme" id="rememberme-0" value="Remember me">
Remember me
</label>
</div>
</div>
<!-- Button -->
<div class="control-group">
<label class="control-label" for="signin"></label>
<div class="controls">
<button id="signin" name="signin" class="btn btn-success">Sign In</button>
</div>
</div>
</fieldset>
</form>
</div>
<div class="tab-pane fade" id="signup">
<form class="form-horizontal">
<fieldset>
<!-- Sign Up Form -->
<!-- Text input-->
<div class="control-group">
<label class="control-label" for="Email">Email:</label>
<div class="controls">
<input id="Email" name="Email" class="form-control" type="text" placeholder="JoeSixpack@sixpacksrus.com" class="input-large" required="">
</div>
</div>
<!-- Text input-->
<div class="control-group">
<label class="control-label" for="userid">Alias:</label>
<div class="controls">
<input id="userid" name="userid" class="form-control" type="text" placeholder="JoeSixpack" class="input-large" required="">
</div>
</div>
<!-- Password input-->
<div class="control-group">
<label class="control-label" for="password">Password:</label>
<div class="controls">
<input id="password" name="password" class="form-control" type="password" placeholder="********" class="input-large" required="">
<em>1-8 Characters</em>
</div>
</div>
<!-- Text input-->
<div class="control-group">
<label class="control-label" for="reenterpassword">Re-Enter Password:</label>
<div class="controls">
<input id="reenterpassword" class="form-control" name="reenterpassword" type="password" placeholder="********" class="input-large" required="">
</div>
</div>
<!-- Multiple Radios (inline) -->
<br>
<div class="control-group">
<label class="control-label" for="humancheck">Humanity Check:</label>
<div class="controls">
<label class="radio inline" for="humancheck-0">
<input type="radio" name="humancheck" id="humancheck-0" value="robot" checked="checked">I'm a Robot</label>
<label class="radio inline" for="humancheck-1">
<input type="radio" name="humancheck" id="humancheck-1" value="human">I'm Human</label>
</div>
</div>
<!-- Button -->
<div class="control-group">
<label class="control-label" for="confirmsignup"></label>
<div class="controls">
<button id="confirmsignup" name="confirmsignup" class="btn btn-success">Sign Up</button>
</div>
</div>
</fieldset>
</form>
</div>
</div>
</div>
<div class="modal-footer">
<center>
<button type="button" class="btn btn-default" data-dismiss="modal">Close</button>
</center>
</div>
</div>
</div>
</div>
</body>
</html>