JS Implementation alert shows the method of line wrapping _javascript tips

The example in this article describes the method of displaying line wrapping in JS implementation alert. Share to everyone for your reference, specific as follows:
Let's start with a more complicated approach, but this approach can be used to identify any type of browser:

Browser type decision
function Getos ()
{
  if (navigator.userAgent.indexOf ("MSIE") >0) {return
     "IE"; Internetexplor
  }
  else if (Isfirefox=navigator.useragent.indexof ("Firefox") >0) {return
     "FF"; Firefox
  }
  else if (Issafari=navigator.useragent.indexof ("Safari") >0) {return
     "SF";//safari
  }
  Else if (Iscamino=navigator.useragent.indexof ("Camino") >0) {return
     "C";//camino
  }
  else if ( Ismozilla=navigator.useragent.indexof ("gecko/") >0) {return
     "G";//gecko
  }
  else if (ismozilla= Navigator.userAgent.indexOf ("Opera") >=0) {return
     "O";//opera
  }else{return
    ' other ';
  }
function Alert_br () {
  var os=getos ();
  if (os== ' FF ' | | | | | os== ' SF ') {//firefox, Google Browser with this
    alert (' first row \ second row ');
  } else{  //ie Series with this
    alert (' first line \ r \ n second line);
  }
}
ALERT_BR ();

The second is relatively simple, but only a simple distinction between IE and other browsers:

function Alert_br () {
  if (!document.all)//ff/{Google Browser with this
    alert (' first row \ second row ');
  } else{  //ie Series with this
    alert (' first line \ r \ n second line);
  }
}
ALERT_BR ();

I hope this article will help you with JavaScript programming.