分享原生JavaScript技巧大收集(31~40)移动篇

31、原生JavaScript判断是否移动设备

function isMobile(){

if (typeof this._isMobile === 'boolean'){

return this._isMobile;

}

var screenWidth = this.getScreenWidth();

var fixViewPortsExperiment = rendererModel.runningExperiments.FixViewport || rendererModel.runningExperiments.fixviewport;

var fixViewPortsExperimentRunning = fixViewPortsExperiment && (fixViewPortsExperiment.toLowerCase() === "new");

if(!fixViewPortsExperiment){

if(!this.isAppleMobileDevice()){

screenWidth = screenWidth/window.devicePixelRatio;

}

}

var isMobileScreenSize = screenWidth < 600;

var isMobileUserAgent = false;

this._isMobile = isMobileScreenSize && this.isTouchScreen();

return this._isMobile;

}

32、原生JavaScript判断是否移动设备访问

function isMobileUserAgent(){

return (/iphone|ipod|android.*mobile|windows.*phone|blackberry.*mobile/i.test(window.navigator.userAgent.toLowerCase()));

}

33、原生JavaScript判断是否苹果移动设备访问

function isAppleMobileDevice(){

return (/iphone|ipod|ipad|Macintosh/i.test(navigator.userAgent.toLowerCase()));

}

34、原生JavaScript判断是否安卓移动设备访问

function isAndroidMobileDevice(){

return (/android/i.test(navigator.userAgent.toLowerCase()));

}

35、原生JavaScript判断是否Touch屏幕

function isTouchScreen(){

return (('ontouchstart' in window) || window.DocumentTouch && document instanceof DocumentTouch);

}

36、原生JavaScript判断是否在安卓上的谷歌浏览器

function isNewChromeOnAndroid(){

if(this.isAndroidMobileDevice()){

var userAgent = navigator.userAgent.toLowerCase();

if((/chrome/i.test(userAgent))){

var parts = userAgent.split('chrome/');

var fullVersionString = parts[1].split(" ")[0];

var versionString = fullVersionString.split('.')[0];

var version = parseInt(versionString);

if(version >= 27){

return true;

}

}

}

return false;

}

37、原生JavaScript判断是否打开视窗

function isViewportOpen() {

return !!document.getElementById('wixMobileViewport');

}

38、原生JavaScript获取移动设备初始化大小

function getInitZoom(){

if(!this._initZoom){

var screenWidth = Math.min(screen.height, screen.width);

if(this.isAndroidMobileDevice() && !this.isNewChromeOnAndroid()){

screenWidth = screenWidth/window.devicePixelRatio;

}

this._initZoom = screenWidth /document.body.offsetWidth;

}

return this._initZoom;

}

39、原生JavaScript获取移动设备最大化大小

function getZoom(){

var screenWidth = (Math.abs(window.orientation) === 90) ? Math.max(screen.height, screen.width) : Math.min(screen.height, screen.width);

if(this.isAndroidMobileDevice() && !this.isNewChromeOnAndroid()){

screenWidth = screenWidth/window.devicePixelRatio;

}

var FixViewPortsExperiment = rendererModel.runningExperiments.FixViewport || rendererModel.runningExperiments.fixviewport;

var FixViewPortsExperimentRunning = FixViewPortsExperiment && (FixViewPortsExperiment === "New" || FixViewPortsExperiment === "new");

if(FixViewPortsExperimentRunning){

return screenWidth / window.innerWidth;

}else{

return screenWidth / document.body.offsetWidth;

}

}

40、原生JavaScript获取移动设备屏幕宽度

function getScreenWidth(){

var smallerSide = Math.min(screen.width, screen.height);

var fixViewPortsExperiment = rendererModel.runningExperiments.FixViewport || rendererModel.runningExperiments.fixviewport;

var fixViewPortsExperimentRunning = fixViewPortsExperiment && (fixViewPortsExperiment.toLowerCase() === "new");

if(fixViewPortsExperiment){

if(this.isAndroidMobileDevice() && !this.isNewChromeOnAndroid()){

smallerSide = smallerSide/window.devicePixelRatio;

}

}

return smallerSide;

}

文章来源：jquery教程 - http://www./Show.aspx?id=303