Use JavaScript to determine whether the user is using IE6 or IE7_javascript techniques

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js determines IE6/IE7/ FF

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The code is as follows:

if (window.XMLHttpRequest) { //Mozilla, Safari,IE7
alert('Mozilla, Safari,IE7 ');
if(!window.ActiveXObject){ // Mozilla, Safari,
alert('Mozilla, Safari');
} else {
alert('IE7');
}
} else {
alert('IE6');
}

More detailed code is available Refer to JavaScript to determine the browser type and version