识别 Android、iOS，判断是否在微信、小程序中访问
2021-11-25 21:55:59
利用userAgent，识别 Android、iOS，判断是否在微信、小程序中访问
```
var ua = navigator.userAgent.toLowerCase();
var isWeixin = ua.indexOf('micromessenger') !== -1;
var isAndroid = ua.indexOf('android') !== -1;
var isIos = (ua.indexOf('iphone') !== -1) || (ua.indexOf('ipad') !== -1);
var isMiniProgram = ua.indexOf('miniprogram') !== -1
```