jQuery key up

HTML

<input id="name" placeholder='İsminizi Yazın'>
<h2>Hoşgeldiniz </h2>
<h2 id="user-name"></h2>

CSS

h2 {
    display:inline-block;
}

JavaScript

$("#name").keyup(updateName)

function updateName() {
   var name=$("#name").val();
   $("#user-name").text(name);   
}