swiftwwj 2020-02-09
bootstrap下拉框由div>button ul>li>a 构成
div的类为:dropdown
a标签必须写
button的类为: dropdown-toggle 必带属性:data-toggle="dropdown"
ul的类为:dropdown-menu
获取事件触发的对象为:event.target
<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title>下拉框</title> <link rel="stylesheet" type="text/css" href="css/bootstrap.min.css"/> </head> <body> <div id="" class="dropdown"> <button type="button" class="btn btn-default dropdown-toggle" data-toggle="dropdown">切换</button> <ul class="dropdown-menu"> <li><a href="javascrip:void(0)">嘻嘻</a></li> <li><a href="javascrip:void(0)">哈哈</a></li> <li><a href="javascrip:void(0)">吼吼</a></li> </ul> </div> <script src="js/jQuery-3.4.1.js" type="text/javascript" charset="utf-8"></script> <script src="js/bootstrap.min.js" type="text/javascript" charset="utf-8"></script> <script type="text/javascript"> var btn = $(".dropdown-toggle"); var ul = $(".dropdown-menu"); ul.click(function(){ btn.html(event.target.innerHTML); }) </script> </body> </html>