JavaScript判断终端机型

var browser = {
  iphone: (/(iPhone|iPad|iPod|iOS)/i.test(navigator.userAgent)),
  android: (/(Android)/i.test(navigator.userAgent)),
  micromessenger: (/(MicroMessenger)/i.test(navigator.userAgent)),
  pc: !(/(iPhone|iPad|iPod|iOS|Android)/i.test(navigator.userAgent))
}

if (browser.micromessenger) {
  alert('在微信内');
}

if (browser.iphone) {
  alert('iOS');
} else if (browser.android) {
  alert('Android');
} else if (browser.pc) {
  alert('电脑');
};

更多参考

​​https://www.feiniaomy.com/post/305.html​​​​​​

​​https://www.kancloud.cn/yby_123/yang1/787276​​​