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if(window.navigator.userAgent.toLowerCase().indexOf("msie") > 0){
return “IE”;
}
if(window.navigator.userAgent.toLowerCase().indexOf("msie 8.0") > -1){
return “IE 8”;
}
firefox判断应该是ua.match(/firefox[\/\s](\d+)/);
var isIE=!!window.ActiveXObject;
var isIE6=isIE&&!window.XMLHttpRequest;
var isIE8=isIE&&!!document.documentMode;
var isIE7=isIE&&!isIE6&&!isIE8;
if (isIE){
if (isIE6){
alert("ie6");
}else if (isIE8){
alert("ie8");
}else if (isIE7){
alert("ie7");
}
}
f(navigator.appName == "Microsoft Internet Explorer" && navigator.appVersion.match(/6./i)=="6."){
alert("IE 6");
}
else if(navigator.appName == "Microsoft Internet Explorer" && navigator.appVersion.match(/7./i)=="7."){
alert("IE 7");
}
else if(navigator.appName == "Microsoft Internet Explorer" && navigator.appVersion.match(/8./i)=="8."){
alert("IE 8");
}
else if(navigator.appName == "Microsoft Internet Explorer" && navigator.appVersion.match(/9./i)=="9."){
alert("IE 9");
}
if(navigator.userAgent.indexOf("Opera") != -1) {
alert(‘Opera‘);
}
else if(navigator.userAgent.indexOf("MSIE") != -1) {
alert(‘Internet Explorer‘);
}
else if(navigator.userAgent.indexOf("Firefox") != -1) {
alert(‘Firefox‘);
}
else if(navigator.userAgent.indexOf("Netscape") != -1) {
alert(‘Netscape‘);
}
else if(navigator.userAgent.indexOf("Safari") != -1) {
alert(‘Safari‘);
}
else{
alert(‘无法识别的浏览器。‘);
}
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原文地址:http://www.cnblogs.com/fang51/p/4496776.html