js 判断浏览器类型以及操作系统

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var sUserAgent = navigator.userAgent;//浏览器判断值//检测Opera、KHTMLvar isOpera = sUserAgent.indexOf("Opera") > -1;var isKHTML = sUserAgent.indexOf("KHTML") > -1 || sUserAgent.indexOf("Konqueror") > -1 || sUserAgent.indexOf("AppleWebKit") > -1;//检测IE、Mozillavar isIE = sUserAgent.indexOf("compatible") > -1 && sUserAgent.indexOf("MSIE") > -1 && !isOpera;var isMoz = sUserAgent.indexOf("Gecko") > -1 && !isKHTML;//检测操作系统//navigator.platform  运行浏览器的计算机平台的字符串表示var isWin = (navigator.platform == "Win32") || (navigator.platform == "Windows");var isMac = (navigator.platform == "Mac68K") || (navigator.platform == "MacPPC") || (navigator.platform == "Macintosh");var isUnix = (navigator.platform == "X11") && !isWin && !isMac;if(isOpera) document.write("Opera ");if(isKHTML) document.write("KHTML ");if(isIE) document.write("IE ");if(isMoz) document.write("Mozilla ");if(isWin) document.write("Windows");if(isMac) document.write("Mac");if(isUnix) document.write("Unix");