if ( window.sidebar && "object" == typeof( window.sidebar ) && "function" == typeof( window.sidebar.addPanel ) ) //  firefox

{
  }
   else if ( document.all && "object" == typeof( window.external ) )   //  ie

   {
    }

<coding-1 lang="other">
<script type="text/javascript">
var browser={
versions:function(){
var u = navigator.userAgent, app = navigator.appVersion;
return {
trident: u.indexOf('Trident') > -1, //IE內核
presto: u.indexOf('Presto') > -1, //opera內核
webKit: u.indexOf('AppleWebKit') > -1, //蘋果、谷歌內核
gecko: u.indexOf('Gecko') > -1 && u.indexOf('KHTML') == -1, //火狐內核
mobile: !!u.match(/AppleWebKit.*Mobile.*/)||!!u.match(/AppleWebKit/), //是否為移動終端
ios: !!u.match(//(i[^;]+;( U;)? CPU.+Mac OS X/), //ios終端
android: u.indexOf('Android') > -1 || u.indexOf('Linux') > -1, //android終端或者uc瀏覽器
iPhone: u.indexOf('iPhone') > -1 || u.indexOf('Mac') > -1, //是否為iPhone或者QQHD瀏覽器
iPad: u.indexOf('iPad') > -1, //是否iPad
webApp: u.indexOf('Safari') == -1 //是否web應該程序，沒有頭部與底部
};
}()
}

document.writeln(" 是否為移動終端: "+browser.versions.mobile);
document.writeln(" ios終端: "+browser.versions.ios);
document.writeln(" android終端: "+browser.versions.android);
document.writeln(" 是否為iPhone: "+browser.versions.iPhone);
document.writeln(" 是否iPad: "+browser.versions.iPad);
document.writeln(navigator.userAgent);
</script>
</coding>