JS判断是手机还是PC

if (window.navigator.userAgent.match(/(phone|pad|pod|iPhone|iPad|iPod|ios|Android|Mobile|BlackBerry|IEMobile|MQQBrowser|JUC|Fennec|wOSBrowser|BrowserNG|WebOS|Symbian|Windows Phone)/i)) {
    return 'mobile'
} else {
    return 'pc'
}