<!doctype html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport"
content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Document</title>
第一坑
<script src="./bootstrap-3.3.7-dist/js/jQuery.js"></script>
<script src="./bootstrap-3.3.7-dist/js/bootstrap.js"></script>
<link rel="stylesheet" href="./bootstrap-3.3.7-dist/css/bootstrap.css">
先引入jQuery ./引入
</head>
<body>
<script>
console.log($)
</script>
<div class="dropdown">
<button class="btn btn-default dropdown-toggle" type="button" id="dropdownMenu1" data-toggle="dropdown" aria-haspopup="true" aria-expanded="true">
Dropdown <span class="caret"></span>
</button>
<ul class="dropdown-menu" aria-labelledby="dropdownMenu4">
<li><a href="#">Regular link</a></li>
<li class="disabled"><a href="#">Disabled link</a></li>
<li role="separator" class="divider"></li>
<li><a href="#">Another link</a></li>
</ul>
</div>
</body>
</html>