<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>javascript - Obtener el valor de un input type=text de varias maneras</title>
<script>
function copiar() { if( document.getElementById("text1").value == '261') { document.getElementById("text2").value='mza'; }
else if( document.getElementById("text1").value == '11') { document.getElementById("text2").value='bsas'; }
else if( document.getElementById("text1").value == '381') { document.getElementById("text2").value='cba'; } else
document.getElementById("text2").value=''; ;
}
function deshabilita()
{ if(document.getElementById('text2').value='') { document.getElementById('enviar').disabled=true; }
else
{ document.getElementById('enviar').disabled=false; }
}
</script>
<form>
<label></label>
<form name="form1" method="post" action="">
<label>
<input type="password" name="text1" id="text1" onBlur="copiar() deshabilita()">
<input type="text" name="text2" id="text2">
<input type="submit" name="Submit" value="Enviar">
<br>
</form>
</html>