判断是否是PC

isPC(){
				const ua = navigator.userAgent;
				const mobileKeywords = [
					/Mobile/i,
					/Android/i,
					/iPhone/i,
					/iPad/i,         
					/iPod/i,
					/BlackBerry/i,
					/Windows Phone/i
				];
				return !mobileKeywords.some(regex => regex.test(ua));
			},