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這很簡單。如果引用所有流行的，並且我與我正在觀看的視頻完全相同的代碼，所以我不知道發生了什麼。如果點擊我的下拉菜單，會發生什麼情況，它不會下降。下拉菜單不工作引導程序
這裏是我的代碼：
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>Bootstrap 101 Template</title>
<!-- Bootstrap -->
<link href="css/bootstrap.min.css" rel="stylesheet">
<!-- HTML5 Shim and Respond.js IE8 support of HTML5 elements and media queries -->
<!-- WARNING: Respond.js doesn't work if you view the page via file:// -->
<!--[if lt IE 9]>
<script src="https://oss.maxcdn.com/libs/html5shiv/3.7.0/html5shiv.js"></script>
<script src="https://oss.maxcdn.com/libs/respond.js/1.4.2/respond.min.js"></script>
<![endif]-->
</head>
<body>
<div class="container">
<div class="row">
<div class="cox-md-12">
<ul class="nav nav-pills">
<li class="active"><a href="#">Index</a></li>
<li><a href="#">Push Pull</a></li>
<li><a href="#">Nesting</a></li>
<li><a href="#" class="dropdown-toggle" data-toggle="dropdown">Dropdown<span class="caret"></span></a>
<ul class="dropdown-menu">
<li><a href="#">Item 1</a></li>
<li><a href="#">Item 2</a></li>
</ul>
</li>
</ul>
</div>
</div>
</div>
<!-- jQuery (necessary for Bootstrap's JavaScript plugins) -->
<script src="js/jquery.min.js"></script>
<!-- Include all compiled plugins (below), or include individual files as needed -->
<script src="js/bootstrap.min.js"></script>
</body>
</html>
我的CSS代碼：
html{
position: relative;
width: 100%;
min-height: 100%;
}
body{
font-family: "Roboto";
margin-bottom: 60px;
}
a{
color:#00A0F0;
}
.spacer{
height:70px;
width: 100%;
}
.spacer-1{width:100%;height:10px;}.spacer-2{width:100%;height:20px;}.spacer-3{width:100%;height:30px;}.spacer-4{width:100%;height:40px;}
.spacer-5{width:100%;height:50px;}.spacer-6{width:100%;height:60px;}.spacer-7{width:100%;height:70px;}.spacer-8{width:100%;height:80px;}
.spacer-9{width:100%;height:90px;}.spacer-10{width:100%;height:100px;}.spacer-11{width:100%;height:110px;}.spacer-12{width:100%;height:120px;}
.locationTitle{
text-align: left;
font-weight: 700;
font-size: 2em;
color:#06a;
margin-bottom: 24px;
margin-left: 24px;
margin-top: 24px;
}
.subTitle{
text-align: center;
}
.subHead{
line-height: 1em;
font-size: .6em;
}
.navbar{
border: 0px solid #white;
border-bottom: 2px solid #CCC;
box-shadow: 0 0 2px 1px grey;
height: 100px;
background-color: white;
}
.navbar>.container-fluid{
height: 100px;
padding: 0;
}
.navbar>.container-fluid>*{
height: 100px;
}
.navbar>.container-fluid img{
height: 100px;
}
.branding *{
display: block;
text-align: center;
padding: 2px 6px 6px;
color: #06a
}
.navRows{
height: 100%;
padding: 0px;
}
.navRows>div{
font-size: 1.4em;
line-height: 40px;
padding: 5px 0;
text-align: center;
}
.navRows[data-expand="false"]>div{
height: 50%;
}
.navRows[data-expand="true"]>div{
background-color: #06a;
text-align: left;
z-index: 9999;
}
.contactspacer {
margin-top: 45px;
}
.navIcon{
padding: 10px;
border-radius: 50%;
color:white;
background-color: #06a;
}
.navTopRow{
background-color: #06a;
color: white
margin-top: 50px;
}
.navTopRow a{
margin-top: 25px;
color: white;
font-size: 16px;
}
.navbar > li > a:hover{
text-shadow: 0 1px 3px #CDF;
}
.navbar li:not(.navSep):hover{
margin: 0 0 -2px 0;
border-bottom: 2px solid white;
}
.navSep{
width:2px;
height: 40px;
margin: 5px 2px 5px 2px;
background-color: #A9AFDD;
}
.imgCon{
max-height: 100%;
max-width:100%;
}
.imgCon img{
width: auto;
height: auto;
max-width:100%;
max-height: 100%;
}
.page{
width: 100%;
height: 100%;
padding-bottom:50px;
}
@media (max-width:768px){
div[aria-expanded="true"] .navSep{
display: none;
}
}
.mainTitle{
font-size: 1.5em;
font-weight: 700;
background-color: white;
}
.extraInfo{
background-color: #333;
color:white;
box-shadow: 1px 1px 2px 1px grey;
font-size: 1.2em;
}
.footer{
background-color: #06a;
position: absolute;
bottom: 0;
width: 100%;
height: 100px;
text-align: right;
}
.footer a{
text-align: center;
border-top: 1px solid grey;
height: 100%;
color: white;
}
.footer p{
text-align: center;
height: 100%;
color: white;
}
@media (min-width : 1200px) {
.col-xl-0{display:none;}
}
@media (max-width : 1200px){
.col-lg-0{display:none;}
}
@media (max-width : 992px){
.col-md-0{display:none;}
}
@media (max-width : 768px){
.col-sm-0{display:none;}
}
@media (max-width : 480px){
.col-xs-0{display:none;}
}
@font-face {
font-family: 'Roboto';
font-style: normal;
font-weight: 400;
src: local('Roboto'), local('Roboto-Regular'), url(https://fonts.gstatic.com/s/roboto/v15/CWB0XYA8bzo0kSThX0UTuA.woff2) format('woff2');
}
@font-face {
font-family: 'Roboto';
font-style: normal;
font-weight: 700;
src: local('Roboto Bold'), local('Roboto-Bold'), url(https://fonts.gstatic.com/s/roboto/v15/d-6IYplOFocCacKzxwXSOFtXRa8TVwTICgirnJhmVJw.woff2) format('woff2');
}
感謝輸入，但我找到了答案。我的jquery文件是jquery-1.2.0.min.js，並且我的代碼是jquery.min.js。 –