<html>
<head>
<meta charset="utf-8">
<title>jQuery</title>
</head>
<body>
İsim:<input id="isimInput" type="text"/>
Merhaba <span id="isimSpan"></span>!
<script>
$('#isimInput').on('keyup', function(){
$('#isimSpan').html($('#isimInput').val());
});
</script>
</body>
</html>