IE8版本以下浏览器升级提醒

<!--[if lt IE 9]>
	<div id="iealert" style="padding:5px 10px;background:#F2DEDE;color:#a94442;position:relative;"><dl><dt style="font-size:16px;">Detect your browser use a low version</dt><dd style="font-size:14px;">Detect your browser use a low version, in order to ensure that let you have the best browsing experience,please upgrade your browser<dd style="font-size:14px;"><a style="color:#3879D9" href="http://windows.microsoft.com/en-US/internet-explorer/download-ie">Click to download the latest version of IE browser</a>, Or use other advanced browser, such as <a style="color:#3879D9" href="https://www.google.com/chrome/index.html">Chrome</a> or <a style="color:#3879D9" href="http://www.mozilla.org/en-US/firefox/new">Firefox</a></dd></dl><span style="position:absolute;top:2px;right:5px;font-size:20px;cursor:pointer;" onclick="document.getElementById('iealert').parentNode.removeChild(document.getElementById('iealert'))">×</span></div>
	<script src="https://cdn.bootcss.com/respond.js/1.4.2/respond.min.js"></script>
	<script src="https://cdn.bootcss.com/html5shiv/r29/html5.min.js"></script>
<![endif]-->