下拉框多选
<!DOCTYPE html> <html> <head> <meta charset="UTF-8" /> <title>BootStrap-Select</title> <link rel="stylesheet" href="https://cdn.bootcss.com/twitter-bootstrap/3.3.7/css/bootstrap.min.css" /> <link rel="stylesheet" href="https://cdn.bootcss.com/font-awesome/4.5.0/css/font-awesome.min.css" /> <link rel="stylesheet" href="https://cdn.bootcss.com/bootstrap-select/1.13.6/css/bootstrap-select.css" /> <script src="https://cdn.bootcss.com/jquery/1.11.1/jquery.min.js"></script> <script src="https://cdn.bootcss.com/twitter-bootstrap/3.3.7/js/bootstrap.min.js"></script> <script src="https://cdn.bootcss