浏览器检测
<html><head><script type="text/javascript">function detectBrowser(){var browser=navigator.appNamevar b_version=navigator.appVersionvar version=parseFloat(b_version)if ((browser=="Netscape"||browser=="Microsoft Internet Explorer")&& (version>=4)){alert("Your browser is good enough!")}else{alert("It's time to upgrade your browser!")}}</script></head><body ></body></html>
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