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; width: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">');
}