JavaScript判断是否移动设备，哪种移动设备

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;
}

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

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

function isAndroidMobileDevice(){
	return (/android/i.test(navigator.userAgent.toLowerCase()));
}

function isTouchScreen(){
	return (('ontouchstart' in window) || window.DocumentTouch && document instanceof DocumentTouch);
}

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;
}

function isViewportOpen() {
	return !!document.getElementById('wixMobileViewport');
}

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;
}

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;
	}
}

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;
}

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