<span style="font-size:12px">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) || [];

//如果需要獲取瀏覽器版本號：match[2]

switch(match[1]){
case "msie": //ie
if (parseInt(match[2]) === 6){ //ie6
alert("ie6");
alert("暫時不支持IE7.0及以下版本瀏覽器，請升級您的瀏覽器版本！");
//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;
}
} </span>

<!--[if IE]><p>You are using Internet Explorer.</p><![endif]-->
<!--[if IE 7]><p>Welcome to Internet Explorer 7!</p><![endif]-->
<!--[if !(IE 7)]><p>You are not using version 7.</p><![endif]-->
<!--[if gte IE 7]><p>You are using IE 7 or greater.</p><![endif]-->
<!--[if (IE 5)]><p>You are using IE 5 (any version).</p><![endif]-->
<!--[if (gte IE 5.5)&(lt IE 7)]><p>You are using IE 5.5 or IE 6.</p><![endif]-->
<!--[if lt IE 5.5]><p>Please upgrade your version of Internet Explorer.</p><![endif]-->