1.判断安卓

export function isAndroid() {const ua = navigator.userAgent;return ua.indexOf('Android') > -1 || ua.indexOf('Adr') > -1;
}

2.判断IOS

export function isiOS() {const ua = navigator.userAgent;return !!ua.match(/\(i[^;]+;( U;)? CPU.+Mac OS X/);
}

3.判断微信

export function isWeixinBrowser() {const ua = window.navigator.userAgent.toLowerCase();const tag = 'micromessenger';return ua.indexOf(tag) > -1;
}

4.判断某APP

export function isUserApp() {const tag = 'ZZZBrowser';const ua = navigator.userAgent;return ua.indexOf(tag) > -1;
}