引入js

<script src="https://cdn.bootcdn.net/ajax/libs/mobile-detect/1.4.5/mobile-detect.min.js"></script>

使用

var md = new MobileDetect(window.navigator.userAgent);
var a = md.mobile();
var b = md.os();
var c = md.userAgent();

详见 mobile-detect 中文网  ​​https://www.mobile-detect.cn/​​

CND:  ​​https://www.bootcdn.cn/mobile-detect/​​