在研究动态导航标签的过程中，我决定在用户点击他们选择的标签时添加淡入效果。
首次加载模态时，以下html行会使故障显示HOME标签。
<div id="home" class="tab-pane active">
以上工作正常，但......
如果我用以下html代码替换上面的代码......
<div id="home" class="tab-pane active fade in">
首次加载模态时，div home 不会褪色。只有当用户点击其他标签然后返回“首页”标签时，它才会生效。
我的问题是，这种行为是否正常？
<!-- 1. BOOTSTRAP v4.0.0 CSS !-->
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css" integrity="sha384-Gn5384xqQ1aoWXA+058RXPxPg6fy4IWvTNh0E263XmFcJlSAwiGgFAW/dAiS6JXm" crossorigin="anonymous">
<!-- 2. GOOGLE JQUERY JS v3.2.1 JS !-->
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<!-- 3. BOOTSTRAP v4.0.0 JS !-->
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/js/bootstrap.min.js" integrity="sha384-JZR6Spejh4U02d8jOt6vLEHfe/JQGiRRSQQxSfFWpi1MquVdAyjUar5+76PVCmYl" crossorigin="anonymous"></script>
<!-- Toggleable / Dynamic Tabs -->
<nav class="nav nav-tabs nav-justified">
<a class="nav-item nav-link active" data-toggle="tab" href="#home">Home</a>
<a class="nav-item nav-link" data-toggle="tab" href="#menu1">Menu 1</a>
<a class="nav-item nav-link" data-toggle="tab" href="#menu2">Menu 2</a>
<a class="nav-item nav-link disabled" data-toggle="tab" href="#menu3">Disabled</a>
</nav>
<div class="tab-content">
<div id="home" class="tab-pane active fade in">
<h3>HOME</h3>
<p>Some content in menu HOME.</p>
</div>
<div id="menu1" class="tab-pane fade">
<h3>Menu 1</h3>
<p>Some content in menu 1.</p>
</div>
<div id="menu2" class="tab-pane fade">
<h3>Menu 2</h3>
<p>Some content in menu 2.</p>
</div>
<div id="menu3" class="tab-pane fade">
<h3>Menu 3</h3>
<p>Some content in menu 3.</p>
</div>
</div>
答案 0 :(得分：17)
在标签内容类
中使用fade show而不是fade in
参考 https://getbootstrap.com/docs/4.0/components/navs/?#javascript-behavior
这是在bootstrap 4上解决它的方法。但是在bootstrap 3中，你的代码应该正常工作。
bootstrap的相关问题3。 Bootstrap tab - active class not working on page loading
<!-- 1. BOOTSTRAP v4.0.0 CSS !-->
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css" integrity="sha384-Gn5384xqQ1aoWXA+058RXPxPg6fy4IWvTNh0E263XmFcJlSAwiGgFAW/dAiS6JXm" crossorigin="anonymous">
<!-- 2. GOOGLE JQUERY JS v3.2.1 JS !-->
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<!-- 3. BOOTSTRAP v4.0.0 JS !-->
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/js/bootstrap.min.js" integrity="sha384-JZR6Spejh4U02d8jOt6vLEHfe/JQGiRRSQQxSfFWpi1MquVdAyjUar5+76PVCmYl" crossorigin="anonymous"></script>
<!-- Toggleable / Dynamic Tabs -->
<nav class="nav nav-tabs nav-justified">
<a class="nav-item nav-link active" data-toggle="tab" href="#home">Home</a>
<a class="nav-item nav-link" data-toggle="tab" href="#menu1">Menu 1</a>
<a class="nav-item nav-link" data-toggle="tab" href="#menu2">Menu 2</a>
<a class="nav-item nav-link disabled" data-toggle="tab" href="#menu3">Disabled</a>
</nav>
<div class="tab-content">
<div id="home" class="tab-pane fade show active">
<h3>HOME</h3>
<p>Some content in menu HOME.</p>
</div>
<div id="menu1" class="tab-pane fade">
<h3>Menu 1</h3>
<p>Some content in menu 1.</p>
</div>
<div id="menu2" class="tab-pane fade">
<h3>Menu 2</h3>
<p>Some content in menu 2.</p>
</div>
<div id="menu3" class="tab-pane fade">
<h3>Menu 3</h3>
<p>Some content in menu 3.</p>
</div>
</div>
答案 1 :(得分：1)
您只需要添加以下元素和bootstrap css。
<!-- 1. BOOTSTRAP v4.0.0 CSS !-->
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css" integrity="sha384-Gn5384xqQ1aoWXA+058RXPxPg6fy4IWvTNh0E263XmFcJlSAwiGgFAW/dAiS6JXm" crossorigin="anonymous">
<!-- 2. GOOGLE JQUERY JS v3.2.1 JS !-->
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<!-- 3. BOOTSTRAP v4.0.0 JS !-->
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/js/bootstrap.min.js" integrity="sha384-JZR6Spejh4U02d8jOt6vLEHfe/JQGiRRSQQxSfFWpi1MquVdAyjUar5+76PVCmYl" crossorigin="anonymous"></script>
<ul class="nav nav-tabs" id="myTab" role="tablist">
<li class="nav-item">
<a class="nav-link active" id="home-tab" data-toggle="tab" href="#home" role="tab" aria-controls="home" aria-selected="true">Home</a>
</li>
<li class="nav-item">
<a class="nav-link" id="profile-tab" data-toggle="tab" href="#profile" role="tab" aria-controls="profile" aria-selected="false">Profile</a>
</li>
<li class="nav-item">
<a class="nav-link" id="contact-tab" data-toggle="tab" href="#contact" role="tab" aria-controls="contact" aria-selected="false">Contact</a>
</li>
</ul>
<div class="tab-content" id="myTabContent">
<div class="tab-pane fade show active" id="home" role="tabpanel" aria-labelledby="home-tab"><p>Raw denim you probably haven't heard of them jean shorts Austin. Nesciunt tofu stumptown aliqua, retro synth master cleanse. Mustache cliche tempor, williamsburg carles vegan helvetica. Reprehenderit butcher retro keffiyeh dreamcatcher synth. Cosby sweater eu banh mi, qui irure terry richardson ex squid. Aliquip placeat salvia cillum iphone. Seitan aliquip quis cardigan american apparel, butcher voluptate nisi qui.</p></div>
<div class="tab-pane fade" id="profile" role="tabpanel" aria-labelledby="profile-tab"><p>Raw denim you probably haven't heard of them jean shorts Austin. Nesciunt tofu stumptown aliqua, retro synth master cleanse. Mustache cliche tempor, williamsburg carles vegan helvetica. Reprehenderit butcher retro keffiyeh dreamcatcher synth. Cosby sweater eu banh mi, qui irure terry richardson ex squid. Aliquip placeat salvia cillum iphone. Seitan aliquip quis cardigan american apparel, butcher voluptate nisi qui.</p></div>
<div class="tab-pane fade" id="contact" role="tabpanel" aria-labelledby="contact-tab"><p>Raw denim you probably haven't heard of them jean shorts Austin. Nesciunt tofu stumptown aliqua, retro synth master cleanse. Mustache cliche tempor, williamsburg carles vegan helvetica. Reprehenderit butcher retro keffiyeh dreamcatcher synth. Cosby sweater eu banh mi, qui irure terry richardson ex squid. Aliquip placeat salvia cillum iphone. Seitan aliquip quis cardigan american apparel, butcher voluptate nisi qui.</p></div>
</div>