JS代碼判斷浏覽器版本,支援IE6,IE7,IE8,IE9！

web開發的時候有時候會用到JS檢測IE的版本，下面是檢測Microsoft Internet Explorer版本的三種代碼！

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"); 
} 
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>