现在很多时候会用@media来控制页面在不同分辨率的设备商展示不同效果，但是有些时候想在直接在PC上展示一个做好的页面，在mobile展示另一个页面。这个时候可以借助device.js来检测设备，然后打开不同的页面（device.js 是一个可以用来检测设备，操作系统和方向的js库）。当然这种做法需要一次跳转。
假设有个m.html想用于mobile端展示，pc.html想用于pc端展示。这个时候可以用index.html作为入口，在<head>内引入device.js来检测设备，然后用js来实现跳转。
当设备为Mobile和tablet的时候展示m.html
否则展示pc.html
<!doctype html> <html lang="en"> <head> <meta charset="utf-8"> <title>responsive demo</title> <script src="device.js"></script> </head> <body style="margin: auto; position: absolute; 100%; height: 100%"> <script> var isMobile = device.mobile(), isTable = device.tablet(); if(isMobile || isTable){ window.open("m.html","_self"); } else{ window.open("pc.html","_self"); } </script> </body> </html> 其中device.js代码如下 (function() { var previousDevice, _addClass, _doc_element, _find, _handleOrientation, _hasClass, _orientation_event, _removeClass, _supports_orientation, _user_agent; previousDevice = window.device; window.device = {}; _doc_element = window.document.documentElement; _user_agent = window.navigator.userAgent.toLowerCase(); device.ios = function() { return device.iphone() || device.ipod() || device.ipad(); }; device.iphone = function() { return _find('iphone'); }; device.ipod = function() { return _find('ipod'); }; device.ipad = function() { return _find('ipad'); }; device.android = function() { return _find('android'); }; device.androidPhone = function() { return device.android() && _find('mobile'); }; device.androidTablet = function() { return device.android() && !_find('mobile'); }; device.blackberry = function() { return _find('blackberry') || _find('bb10') || _find('rim'); }; device.blackberryPhone = function() { return device.blackberry() && !_find('tablet'); }; device.blackberryTablet = function() { return device.blackberry() && _find('tablet'); }; device.windows = function() { return _find('windows'); }; device.windowsPhone = function() { return device.windows() && _find('phone'); }; device.windowsTablet = function() { return device.windows() && _find('touch'); }; device.fxos = function() { return (_find('(mobile;') || _find('(tablet;')) && _find('; rv:'); }; device.fxosPhone = function() { return device.fxos() && _find('mobile'); }; device.fxosTablet = function() { return device.fxos() && _find('tablet'); }; device.meego = function() { return _find('meego'); }; device.mobile = function() { return device.androidPhone() || device.iphone() || device.ipod() || device.windowsPhone() || device.blackberryPhone() || device.fxosPhone() || device.meego(); }; device.tablet = function() { return device.ipad() || device.androidTablet() || device.blackberryTablet() || device.windowsTablet() || device.fxosTablet(); }; device.portrait = function() { return Math.abs(window.orientation) !== 90; }; device.landscape = function() { return Math.abs(window.orientation) === 90; }; device.noConflict = function() { window.device = previousDevice; return this; }; _find = function(needle) { return _user_agent.indexOf(needle) !== -1; }; _hasClass = function(class_name) { var regex; regex = new RegExp(class_name, 'i'); return _doc_element.className.match(regex); }; _addClass = function(class_name) { if (!_hasClass(class_name)) { return _doc_element.className += " " + class_name; } }; _removeClass = function(class_name) { if (_hasClass(class_name)) { return _doc_element.className = _doc_element.className.replace(class_name, ""); } }; if (device.ios()) { if (device.ipad()) { _addClass("ios ipad tablet"); } else if (device.iphone()) { _addClass("ios iphone mobile"); } else if (device.ipod()) { _addClass("ios ipod mobile"); } } else if (device.android()) { if (device.androidTablet()) { _addClass("android tablet"); } else { _addClass("android mobile"); } } else if (device.blackberry()) { if (device.blackberryTablet()) { _addClass("blackberry tablet"); } else { _addClass("blackberry mobile"); } } else if (device.windows()) { if (device.windowsTablet()) { _addClass("windows tablet"); } else if (device.windowsPhone()) { _addClass("windows mobile"); } else { _addClass("desktop"); } } else if (device.fxos()) { if (device.fxosTablet()) { _addClass("fxos tablet"); } else { _addClass("fxos mobile"); } } else if (device.meego()) { _addClass("meego mobile"); } else { _addClass("desktop"); } _handleOrientation = function() { if (device.landscape()) { _removeClass("portrait"); return _addClass("landscape"); } else { _removeClass("landscape"); return _addClass("portrait"); } }; _supports_orientation = "onorientationchange" in window; _orientation_event = _supports_orientation ? "orientationchange" : "resize"; if (window.addEventListener) { window.addEventListener(_orientation_event, _handleOrientation, false); } else if (window.attachEvent) { window.attachEvent(_orientation_event, _handleOrientation); } else { window[_orientation_event] = _handleOrientation; } _handleOrientation(); }).call(this);
当然，也可以用device.js来逐个检测设备。
javascript方法如下。
| Device | JavaScript Method |
|---|---|
| Mobile | device.mobile() |
| Tablet | device.tablet() |
| iOS | device.ios() |
| iPad | device.ipad() |
| iPhone | device.iphone() |
| iPod | device.ipod() |
| Android | device.android() |
| Android Phone | device.androidPhone() |
| Android Tablet | device.androidTablet() |
| BlackBerry | device.blackberry() |
| BlackBerry Phone | device.blackberryPhone() |
| BlackBerry Tablet | device.blackberryTablet() |
| Windows | device.windows() |
| Windows Phone | device.windowsPhone() |
| Windows Tablet | device.windowsTablet() |
| Firefox OS | device.fxos() |
| Firefox OS Phone | device.fxosPhone() |
| Firefox OS Tablet | device.fxosTablet() |
| MeeGo | device.meego() |
比如可以用如下代码来检测设备是否为IOS设备
var isIPhone = device.iphone(),
isIPad = device.ipad();
var isIOS = isIPhone || isIPad;
if(isIOS){
alert(
"is this iOS?"+isIOS
);
}
或者可以用来控制当为mobile或者tablet的时候加载m.css, PC的时候加载pc.css
if(isMobile | isTable){
document.write( ' <link rel="stylesheet" href="m.css">');
}
else{
document.write('<link rel="stylesheet" href="pc.css">');
}