``` 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; } ```