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 rel="stylesheet" href="http://maxcdn.bootstrapcdn.com/bootstrap/3.2.0/css/bootstrap.min.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="http://maxcdn.bootstrapcdn.com/bootstrap/3.2.0/js/bootstrap.min.js"></script>
</body>
</html>
我用火狐和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，不显示二级菜单。请问是什么原因？我应该怎么办才能解决浏览器兼容问题？
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