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function isIE() { //ie?
if (!!window.ActiveXObject || "ActiveXObject" in window)
return true;
else
return false;
}
alert(isIE())
<script language="JavaScript" type="text/javascript">
if ((navigator.userAgent.indexOf('MSIE') >= 0)
&& (navigator.userAgent.indexOf('Opera') < 0)){
alert('你是使用IE')
}else if (navigator.userAgent.indexOf('Firefox') >= 0){
alert('你是使用Firefox')
}else if (navigator.userAgent.indexOf('Opera') >= 0){
alert('你是使用Opera')
}else{
alert('你是使用其他的浏览器浏览网页!')
}
</script>