仓库地址
https://github.com/Megasu/current-device
CURRENT-DEVICE
This module makes it easy to write conditional CSS and/or JavaScript based on
device operating system (iOS, Android, Blackberry, Windows, MacOs, Firefox OS, MeeGo,
AppleTV, etc), orientation (Portrait vs. Landscape), and type (Tablet vs.
Mobile).
EXAMPLES
This module inserts CSS classes into the <html> element.
iPhone
Android Tablet
Blackberry Tablet
DEVICE SUPPORT
- iOS: iPhone, iPod, iPad
- Android: Phones & Tablets
- Blackberry: Phones & Tablets
- Windows: Phones & Tablets
- Firefox OS: Phones & Tablets
USAGE
Just include the script. The script then updates the <html> section with the
appropriate classes
based on the device's characteristics.
Installation
npm install current-device
And then import it:
// using es modules
import device from "current-device";
// common.js
const device = require("current-device").default;
Or use script tags and globals.
<script src="https://unpkg.com/current-device/umd/current-device.min.js"></script>
And then access it off the global like so:
console.log("device.mobile() === %s", device.mobile());
CONDITIONAL CSS
The following tables map which CSS classes are added based on device and
orientation.
Device CSS Class Names
| Device | CSS Classes |
|---|---|
| iPad | ios ipad tablet |
| iPhone | ios iphone mobile |
| iPod | ios ipod mobile |
| Android Phone | android mobile |
| Android Tablet | android tablet |
| BlackBerry Phone | blackberry mobile |
| BlackBerry Tablet | blackberry tablet |
| Windows Phone | windows mobile |
| Windows Tablet | windows tablet |
| Firefox OS Phone | fxos mobile |
| Firefox OS Tablet | fxos tablet |
| MeeGo | meego |
| Desktop | desktop |
| Television | television |
Orientation CSS Class Names
| Orientation | CSS Classes |
|---|---|
| Landscape | landscape |
| Portrait | portrait |
CONDITIONAL JAVASCRIPT
This module also includes support for conditional JavaScript, allowing you to
write checks on the following device characteristics:
Device JavaScript Methods
| Device | JavaScript Method |
|---|---|
| Mobile | device.mobile() |
| Tablet | device.tablet() |
| Desktop | device.desktop() |
| 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() |
| Television | device.television() |
Orientation JavaScript Methods
| Orientation | JavaScript Method |
|---|---|
| Landscape | device.landscape() |
| Portrait | device.portrait() |
Orientation JavaScript Callback
device.onChangeOrientation(newOrientation => {
console.log(`New orientation is ${newOrientation}`);
});
Utility Methods
device.noConflict()
Run current-device in noConflict mode, returning the device variable to its
previous owner. Returns a reference to the device object.
const currentDevice = device.noConflict();
Useful Properties
Access these properties on the device object to get the first match on that
attribute without looping through all of its getter methods.
| JS Property | Returns |
|---|---|
| device.type | 'mobile', 'tablet', 'desktop', or 'unknown' |
| device.orientation | 'landscape', 'portrait', or 'unknown' |
| device.os | 'ios', 'iphone', 'ipad', 'ipod', 'android', 'blackberry', 'windows', 'macos', 'fxos', 'meego', 'television', or 'unknown' |
BEST PRACTICES
Environment detection has a high rate of misuse. Often times, folks will attempt
to work around browser feature support problems by checking for the affected
browser and doing something different in response. The preferred solution for
those kinds of problems, of course, is to check for the feature, not the browser
(ala Modernizr).
However, that common misuse of device detection doesn't mean it should never be
done. For example, current-device could be employed to change the interface of
your web app such that it uses interaction patterns and UI elements common to
the device it's being presented on. Android devices might get a slightly
different treatment than Windows or iOS, for instance. Another valid use-case is
guiding users to different app stores depending on the device they're using.
In short, check for features when you need features, and check for the browser
when you need the browser.
Contributors ✨
Thanks goes to these wonderful people (emoji key):
 Matthew Hudson |
 Rafael Terán |
 Allan |
 martinwepner |
This project follows the all-contributors specification. Contributions of any kind welcome!
源码参考
// Save the previous value of the device variable.
const previousDevice = window.device
const device = {}
const changeOrientationList = []
// Add device as a global object.
window.device = device
// The <html> element.
const documentElement = window.document.documentElement
// The client user agent string.
// Lowercase, so we can use the more efficient indexOf(), instead of Regex
const userAgent = window.navigator.userAgent.toLowerCase()
// Detectable television devices.
const television = [
'googletv',
'viera',
'smarttv',
'internet.tv',
'netcast',
'nettv',
'appletv',
'boxee',
'kylo',
'roku',
'dlnadoc',
'pov_tv',
'hbbtv',
'ce-html'
]
// Main functions
// --------------
device.macos = function() {
return find('mac')
}
device.ios = function() {
return device.iphone() || device.ipod() || device.ipad()
}
device.iphone = function() {
return !device.windows() && find('iphone')
}
device.ipod = function() {
return find('ipod')
}
device.ipad = function() {
const iPadOS13Up =
navigator.platform === 'MacIntel' && navigator.maxTouchPoints > 1
return find('ipad') || iPadOS13Up
};
device.android = function() {
return !device.windows() && 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')
}
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.windowsPhone())
}
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.cordova = function() {
return window.cordova && location.protocol === 'file:'
}
device.nodeWebkit = function() {
return typeof window.process === 'object'
}
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.desktop = function() {
return !device.tablet() && !device.mobile()
}
device.television = function() {
let i = 0
while (i < television.length) {
if (find(television[i])) {
return true
}
i++
}
return false
}
device.portrait = function() {
if (
screen.orientation &&
Object.prototype.hasOwnProperty.call(window, 'onorientationchange')
) {
return includes(screen.orientation.type, 'portrait')
}
if (
device.ios() &&
Object.prototype.hasOwnProperty.call(window, 'orientation')
) {
return Math.abs(window.orientation) !== 90
}
return window.innerHeight / window.innerWidth > 1
}
device.landscape = function() {
if (
screen.orientation &&
Object.prototype.hasOwnProperty.call(window, 'onorientationchange')
) {
return includes(screen.orientation.type, 'landscape')
}
if (
device.ios() &&
Object.prototype.hasOwnProperty.call(window, 'orientation')
) {
return Math.abs(window.orientation) === 90
}
return window.innerHeight / window.innerWidth < 1
}
// Public Utility Functions
// ------------------------
// Run device.js in noConflict mode,
// returning the device variable to its previous owner.
device.noConflict = function() {
window.device = previousDevice
return this
}
// Private Utility Functions
// -------------------------
// Check if element exists
function includes(haystack, needle) {
return haystack.indexOf(needle) !== -1
}
// Simple UA string search
function find(needle) {
return includes(userAgent, needle)
}
// Check if documentElement already has a given class.
function hasClass(className) {
return documentElement.className.match(new RegExp(className, 'i'))
}
// Add one or more CSS classes to the <html> element.
function addClass(className) {
let currentClassNames = null
if (!hasClass(className)) {
currentClassNames = documentElement.className.replace(/^\s+|\s+$/g, '')
documentElement.className = `${currentClassNames} ${className}`
}
}
// Remove single CSS class from the <html> element.
function removeClass(className) {
if (hasClass(className)) {
documentElement.className = documentElement.className.replace(
` ${className}`,
''
)
}
}
// HTML Element Handling
// ---------------------
// Insert the appropriate CSS class based on the _user_agent.
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.macos()) {
addClass('macos desktop')
} 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('windows desktop')
}
} else if (device.fxos()) {
if (device.fxosTablet()) {
addClass('fxos tablet')
} else {
addClass('fxos mobile')
}
} else if (device.meego()) {
addClass('meego mobile')
} else if (device.nodeWebkit()) {
addClass('node-webkit')
} else if (device.television()) {
addClass('television')
} else if (device.desktop()) {
addClass('desktop')
}
if (device.cordova()) {
addClass('cordova')
}
// Orientation Handling
// --------------------
// Handle device orientation changes.
function handleOrientation() {
if (device.landscape()) {
removeClass('portrait')
addClass('landscape')
walkOnChangeOrientationList('landscape')
} else {
removeClass('landscape')
addClass('portrait')
walkOnChangeOrientationList('portrait')
}
setOrientationCache()
}
function walkOnChangeOrientationList(newOrientation) {
for (let index = 0; index < changeOrientationList.length; index++) {
changeOrientationList[index](newOrientation)
}
}
device.onChangeOrientation = function(cb) {
if (typeof cb == 'function') {
changeOrientationList.push(cb)
}
}
// Detect whether device supports orientationchange event,
// otherwise fall back to the resize event.
let orientationEvent = 'resize'
if (Object.prototype.hasOwnProperty.call(window, 'onorientationchange')) {
orientationEvent = 'orientationchange'
}
// Listen for changes in orientation.
if (window.addEventListener) {
window.addEventListener(orientationEvent, handleOrientation, false)
} else if (window.attachEvent) {
window.attachEvent(orientationEvent, handleOrientation)
} else {
window[orientationEvent] = handleOrientation
}
handleOrientation()
// Public functions to get the current value of type, os, or orientation
// ---------------------------------------------------------------------
function findMatch(arr) {
for (let i = 0; i < arr.length; i++) {
if (device[arr[i]]()) {
return arr[i]
}
}
return 'unknown'
}
device.type = findMatch(['mobile', 'tablet', 'desktop'])
device.os = findMatch([
'ios',
'iphone',
'ipad',
'ipod',
'android',
'blackberry',
'macos',
'windows',
'fxos',
'meego',
'television'
])
function setOrientationCache() {
device.orientation = findMatch(['portrait', 'landscape'])
}
setOrientationCache()
export default device