<!DOCTYPE html>
<html lang="pl">
<head>
<meta charset="UTF-8">
<title>jd</title>
<Style>
</style>
</head>
<body>
<table border="1">
<tr>
<td>Znak</td>
<td>Odpowiedź</td>
</tr>
<tr>
<td><input onclick="l()" id="dana"> <input type="submit" value="sprawdź"> </td>
<td><div id="wynik"></div> </td>
</table>
<script>
function l(){
var a=document.getElementById("dana");
var wynik=document.getElementById("wynik");
if(isNan(dana)){
wynik.innerHTML="Liczba";
} else{
wynik.innerHTML="litera";
}
</script>
</body>
</html
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