判断是移动端还是PC端

function judge() {
	let str = (navigator.userAgent.match(/(phone|pad|pod|iPhone|iPod|ios|iPad|Android|Mobile|BlackBerry|IEMobile|MQQBrowser|JUC|Fennec|wOSBrowser|BrowserNG|WebOS|Symbian|Windows Phone)/i)) ? 'app': 'pc';
	return str;
}
console.log(judge()) //pc 或者 app