function myBrowser(){
var userAgent = navigator.userAgent; //取得浏览器的userAgent字符串
var isOpera = userAgent.indexOf("Opera") > -1; //判断是否Opera浏览器
var isIE = userAgent.indexOf("compatible") > -1 &&
userAgent.indexOf("MSIE") > -1 && !isOpera; //判断是否IE浏览器
var isFF = userAgent.indexOf("Firefox") > -1; //判断是否Firefox浏览器
var isSafari = userAgent.indexOf("Safari") > -1; //判断是否Safari浏览器
if (isIE) {
var IE5 = IE55 = IE6 = IE7 = IE8 = false;
var reIE = new RegExp("MSIE (\d+\.\d+);");
reIE.test(userAgent);
var fIEVersion = parseFloat(RegExp["$1"]);
IE55 = fIEVersion == 5.5;
IE6 = fIEVersion == 6.0;
IE7 = fIEVersion == 7.0;
IE8 = fIEVersion == 8.0;
if (IE55) {
return "IE55";
}
if (IE6) {
return "IE6";
}
if (IE7) {
return "IE7";
}
if (IE8) {
return "IE8";
}
}//isIE end
if (isFF) {
return "FF";
}
if (isOpera) {
return "Opera";
}
}//myBrowser() end
//以下是调用上面的函数
if (myBrowser() == "FF") {
alert("我是 Firefox");
}
if (myBrowser() == "Opera") {
alert("我是 Opera");
}
if (myBrowser() == "Safari") {
alert("我是 Safari");
}
if (myBrowser() == "IE55") {
alert("我是 IE5.5");
}
if (myBrowser() == "IE6") {
alert("我是 IE6");
}
if (myBrowser() == "IE7") {
alert("我是 IE7");
}
if (myBrowser() == "IE8") {
alert("我是 IE8");
}