Summary of several methods for determining browser types and IE versions using JS

Copy codeThe Code is as follows: var isIE = !! Window. ActiveXObject;
Var isIE6 = isIE &&! Window. XMLHttpRequest;
Var isIE8 = isIE &&!! Document.doc umentMode;
Var isIE7 = isIE &&! IsIE6 &&! IsIE8;
If (isIE ){
If (isIE6 ){
Alert ("ie6 ");
} Else if (isIE8 ){
Alert ("ie8 ");
} Else if (isIE7 ){
Alert ("ie7 ");
}
}

--------------------------------------------------------------------------------Copy codeThe Code is as follows: if (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 ");
}

--------------------------------------------------------------------------------Copy codeThe Code is as follows: 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 ('unrecognized browser. ');
}

--------------------------------------------------------------------------------Copy codeThe Code is as follows: if (! + '\ V1 '&&! '1' [0]) {
Alert ("ie6 or ie7 ")
}