Javascript 浏览器设备识别
<!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 farvar 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 OSvar mobileOS = typeof orientation != 'undefined' ? true : false;// If touch events are defined we are in a modern touch screen OSvar 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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