js如何判断当前设备是安卓还是iphone（获取手机机型型号）

var events = navigator.userAgent;
if(events.indexOf('Android')>-1 || events.indexOf('Linux')>-1 || events.indexOf('Adr')>-1){
  console.log("安卓手机");
}else if(events.indexOf('iPhone')>-1){
  //根据尺寸进行判断 苹果的型号
  if(screen.height == 812 && screen.width == 375){
    console.log("苹果X");
  }else if(screen.height == 736 && screen.width == 414){
    console.log("iPhone7P - iPhone8P - iPhone6");
  }else if(screen.height == 667 && screen.width == 375){
    console.log("iPhone7 - iPhone8 - iPhone6");
  }else if(screen.height == 568 && screen.width == 320){
    console.log("iPhone5");
  }else{
    console.log("iPhone4");
  }
}else if(events.indexOf('Windows Phone')>-1){
  console.log("诺基亚手机");
}else if(events.indexOf("iPad")>-1){
  console.log("平板");
}