1.运行效果如图所示
2.实现代码如下
<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <meta http-equiv="X-UA-Compatible" content="IE=edge"> <title>表单控件——下拉选择框select元</title> <!-- 最新版本的 Bootstrap 核心 CSS 文件 --> <link rel="stylesheet" href="https://cdn.bootcss.com/bootstrap/3.3.7/css/bootstrap.min.css" integrity="sha384-BVYiiSIFeK1dGmJRAkycuHAHRg32OmUcww7on3RYdg4Va+PmSTsz/K68vbdEjh4u" crossorigin="anonymous"> <!-- 可选的 Bootstrap 主题文件（一般不用引入） --> <link rel="stylesheet" href="https://cdn.bootcss.com/bootstrap/3.3.7/css/bootstrap-theme.min.css" integrity="sha384-rHyoN1iRsVXV4nD0JutlnGaslCJuC7uwjduW9SVrLvRYooPp2bWYgmgJQIXwl/Sp" crossorigin="anonymous"> </head> <body> <form role="form"> <!-- 单选 --> <div class="form-group"> <select name="" id="" class="form-control"> <option value="">1</option> <option value="">2</option> <option value="">3</option> <option value="">4</option> <option value="">5</option> </select> </div> <!-- 多选 --> <div class="form-group"> <select multiple="multiple" name="" id="" class="form-control"> <option value="">a</option> <option value="">b</option> <option value="">c</option> <option value="">d</option> <option value="">e</option> </select> </div> </form> <script src="https://cdn.bootcss.com/jquery/3.2.1/jquery.min.js"></script> <!-- 最新的 Bootstrap 核心 JavaScript 文件 --> <script src="https://cdn.bootcss.com/bootstrap/3.3.7/js/bootstrap.min.js" integrity="sha384-Tc5IQib027qvyjSMfHjOMaLkfuWVxZxUPnCJA7l2mCWNIpG9mGCD8wGNIcPD7Txa" crossorigin="anonymous"></script> </body> </html>
本文转自 素颜猪 51CTO博客，原文链接:http://blog.51cto.com/suyanzhu/1927463