Javascript 浏览器设备识别

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Javascript Browser OS

<!DOCTYPE html>
<html lang="en">
<head>
        <meta charset="utf-8" />
        <title>Screen Width Test</title>
<style type="text/css">
@media all and (max-device-width: 1024px) {
        body {
        background-color: yellow;
        }
}

</style>

</head>
<body>
<script type="text/javascript">
var agent = navigator.userAgent.toLowerCase();
var scrWidth = screen.width;
var scrHeight = screen.height;
// The document.documentElement dimensions seem to be identical to
// the screen dimensions on all the mobile browsers I've tested so far
var elemWidth = document.documentElement.clientWidth;
var elemHeight = document.documentElement.clientHeight;
// We need to eliminate Symbian, Series 60, Windows Mobile and Blackberry
// browsers for this quick and dirty check. This can be done with the user agent.
var otherBrowser = (agent.indexOf("series60") != -1) || (agent.indexOf("symbian") != -1) || (agent.indexOf("windows ce") != -1) || (agent.indexOf("blackberry") != -1);
// If the screen orientation is defined we are in a modern mobile OS
var mobileOS = typeof orientation != 'undefined' ? true : false;
// If touch events are defined we are in a modern touch screen OS
var touchOS = ('ontouchstart' in document.documentElement) ? true : false;
// iPhone and iPad can be reliably identified with the navigator.platform
// string, which is currently only available on these devices.
var iOS = (navigator.platform.indexOf("iPhone") != -1) ||
        (navigator.platform.indexOf("iPad") != -1) ? true : false;
// If the user agent string contains "android" then it's Android. If it
// doesn't but it's not another browser, not an iOS device and we're in
// a mobile and touch OS then we can be 99% certain that it's Android.
var android = (agent.indexOf("android") != -1) || (!iOS && !otherBrowser && touchOS && mobileOS) ? true : false;

document.write("<p><b>Screen width:</b> " + scrWidth +"px<br />" +
                                "<b>Screen height:</b> " + scrHeight + "px<br />" +
                                "<b>Document element width:</b> " + elemWidth +"px<br />" +
                                "<b>Document element height:</b> " + elemHeight + "px<br />" +
                                "<b>iOS device:</b> "+iOS+"<br />"+
                                "<b>Mobile OS:</b> "+mobileOS+"<br />"+
                                "<b>Touch OS:</b> "+touchOS+"<br />"+
                                "<b>Android device:</b> "+android+"</p>" +
                                "<p><b>User agent string:</b> "+navigator.userAgent+"</p>"
                                );
</script>
</body>
</html>

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span元素的width问题 | PPTP/L2TP over PPPoE的準確MTU/MRU值

2012-08-28 10:29
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分类:Web前端
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