JS代码判断IE不同版本

方法一：

<script type="text/javascript"> 
var browser=navigator.appName 
var b_version=navigator.appVersion 
var version=b_version.split(";"); 
var trim_Version=version[1].replace(/[ ]/g,""); 
if(browser=="Microsoft Internet Explorer" && trim_Version=="MSIE6.0") 
{ 
alert("IE 6.0"); 
} 
else if(browser=="Microsoft Internet Explorer" && trim_Version=="MSIE7.0") 
{ 
alert("IE 7.0"); window.location.href="http://xxxx.com";
} 
else if(browser=="Microsoft Internet Explorer" && trim_Version=="MSIE8.0") 
{ 
alert("IE 8.0"); 
} 
else if(browser=="Microsoft Internet Explorer" && trim_Version=="MSIE9.0") 
{ 
alert("IE 9.0"); 
} 
</script>

　　方法二：

<script type="text/javascript"> 
if(navigator.appName == "Microsoft Internet Explorer" && navigator.appVersion .split(";")[1].replace(/[ ]/g,"")=="MSIE6.0") 
{ 
alert("IE 6.0"); 
} 
else if(navigator.appName == "Microsoft Internet Explorer" && navigator.appVersion .split(";")[1].replace(/[ ]/g,"")=="MSIE7.0") 
{ 
alert("IE 7.0"); 
} 
else if(navigator.appName == "Microsoft Internet Explorer" && navigator.appVersion .split(";")[1].replace(/[ ]/g,"")=="MSIE8.0") 
{ 
alert("IE 8.0"); 
} 
else if(navigator.appName == "Microsoft Internet Explorer" && navigator.appVersion .split(";")[1].replace(/[ ]/g,"")=="MSIE9.0") 
{ 
alert("IE 9.0"); 
} 
</script>

方法三：

<script type="text/javascript"> 
if(navigator.appName == "Microsoft Internet Explorer" && navigator.appVersion.match(/7./i)=="7.") 
{ 
alert("IE 7.0"); 
} 
else if(navigator.appName == "Microsoft Internet Explorer" && navigator.appVersion.match(/8./i)=="8.") 
{ 
alert("IE 8.0"); 
} 
else if(navigator.appName == "Microsoft Internet Explorer" && navigator.appVersion.match(/9./i)=="9.") 
{ 
alert("IE 9.0"); 
} 
else if(navigator.appName == "Microsoft Internet Explorer") 
{ 
alert("IE 6.0"); 
} 
</script>

　　朋友又发现了俩，继续补充

方法四：

function browser (){

		var ua=window.navigator.userAgent,
			ret="";

		if(/Firefox/g.test(ua)){

		ua=ua.split(" ");
		ret="Firefox|"+ua[ua.length-1].split("/")[1];

		}else if(/MSIE/g.test(ua)){

		ua=ua.split(";");
		ret="IE|"+ua[1].split(" ")[2];

		}else if(/Opera/g.test(ua)){

		ua=ua.split(" ");
		ret="Opera|"+ua[ua.length-1].split("/")[1];

		}else if(/Chrome/g.test(ua)){

		ua=ua.split(" ");
		ret="Chrome|"+ua[ua.length-2].split("/")[1];

		}else if(/^apples+/i.test(navigator.vendor)){

		ua=ua.split(" ");
		ret="Safair|"+ua[ua.length-2].split("/")[1];

		}else{
			ret="未知浏览器";
			}

	 return ret.split("|");
}


//调用函数，返回一个数组,r[0]是浏览器名称，r[1]是版本号
var r=browser();
alert(r);

 五：

function validBrowser(){ 
var u_agent = navigator.userAgent; 
var browser_name='Failed to identify the browser'; 
if(u_agent.indexOf('Firefox')>-1){ 
browser_name='Firefox'; 
}else if(u_agent.indexOf('Chrome')>-1){ 
browser_name='Chrome'; 
}else if(u_agent.indexOf('Trident')>-1&&u_agent.indexOf('rv:11')>-1){ 
browser_name='IE11'; 
}else if(u_agent.indexOf('MSIE')>-1&&u_agent.indexOf('Trident')>-1){ 
browser_name='IE(8-10)'; 
}else if(u_agent.indexOf('MSIE')>-1){ 
browser_name='IE(6-7)'; 
}else if(u_agent.indexOf('Opera')>-1){ 
browser_name='Opera'; 
}else{ 
browser_name+=',info:'+u_agent; 
} 
document.write('browser_name:'+browser_name+'<br>'); 
document.write('u_agent:'+u_agent+'<br>'); 
}