JavaScript 通过 useragent 判断当前的环境是微信 Android iOS

export const uaHelper = () => {
    let ua = navigator.userAgent;

    // 微信端
   let wx = /MicroMessenger/gi.test(ua);
    if(wx) return 'wx';

    // Android终端
    let android = ua.indexOf('Android') > -1 || ua.indexOf('Adr') > -1;
    if(android) return 'Android';

    // iOS终端
    let iOS = !!ua.match(/\(i[^;]+;( U;)? CPU.+Mac OS X/);
    if(iOS) return 'iOS';

    return null;
}