我在本地新建html文件，代码如下：<!DOCTYPE html><html> <head> <meta charset="utf-8"> <meta http-equiv="X-UA-Compatible" content="IE=edge"> <meta name="viewport" content="width=device-width, initial-scale=1"> <!-- The above 3 meta tags *must* come first in the head; any other head content must come *after* these tags --> <title>Bootstrap 101 Template</title> <!-- Bootstrap --> <link href="css/bootstrap.min.css" rel="stylesheet"> <link rel="stylesheet" href="css/style.css"> <!-- HTML5 shim and Respond.js for 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/html5shiv/3.7.3/html5shiv.min.js"></script> <script src="https://oss.maxcdn.com/respond/1.4.2/respond.min.js"></script> <![endif]--> </head> <body> <div> <button class="btn btn-default dropdown-toggle" type="button" id="dropdownMenu1" data-toggle="dropdown"> 下拉菜单 <span></span> </button> <ul role="menu" aria-labelledby="dropdownMenu1"> <li role="presentation"><a role="menuitem" tabindex="-1" href="#">下拉菜单项</a></li> <li role="presentation"><a role="menuitem" tabindex="-1" href="#">下拉菜单项</a></li> <li role="presentation"><a role="menuitem" tabindex="-1" href="#">下拉菜单项</a></li> <li role="presentation"></li> <li role="presentation"><a role="menuitem" tabindex="-1" href="#">下拉菜单项</a></li> </ul></div> <!-- jQuery (necessary for Bootstrap's JavaScript plugins) --> <script src="https://ajax.googleapis.com/ajax/libs/jquery/1.12.4/jquery.min.js"></script> <!-- Include all compiled plugins (below), or include individual files as needed --> <script src="js/bootstrap.min.js"></script> </body></html>用火狐和google浏览器打开文件后点击下拉菜单能正常显示二级菜单，但用IE和Edge浏览器打开文件后点击下拉菜单无反应。请问是什么原因？
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