js判断jsp页面的浏览器类型与版本

<script>
/**
* 判断浏览器类型和版本号
* by www.jb200.com
*/
function allinfo(){
var ua = navigator.userAgent;
ua = ua.toLowerCase();
var match = /(webkit)[ /]([w.]+)/.exec(ua) ||
/(opera)(?:.*version)?[ /]([w.]+)/.exec(ua) ||
/(msie) ([w.]+)/.exec(ua) ||
!/compatible/.test(ua) && /(mozilla)(?:.*? rv:([w.]+))?/.exec(ua) || [];

//如果需要获取浏览器版本号：match[2]
switch(match[1]){
case "msie": //ie
if (parseInt(match[2]) === 6){ //ie6
alert("ie6");
alert("暂时不支持IE7.0及以下版本浏览器，请升级您的浏览器版本！");
//document.getElementById("hid").style.display = "none";
// document.getElementById("show").style.display = "block";
//document.getElementById("nosee_b").style.display = "none";
}
else if (parseInt(match[2]) === 7) { //ie7
alert("ie7");
//document.getElementById("hid").style.display = "none";
// document.getElementById("show").style.display = "block";
}
else if (parseInt(match[2]) === 8){ //ie8
alert("ie8");
}
else if(parseInt(match[2]) === 9){
alert("ie9");
//document.getElementById("hid").style.display = "none";
}
break;
case "webkit": //safari or chrome
//alert("safari or chrome");
// document.getElementById("middle").style.display = "none";
break;
case "opera": //opera
alert("opera");
break;
case "mozilla": //Firefox
alert("Firefox");
//document.getElementById("hid").style.display = "none";
break;
default:
break;
}
}
</script>