<!doctype html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
</head>
<body>
<script>
function set(){
document.cookie = 'vasya=lol';
}
function get(){
alert(document.cookie);
}
</script>
<input type="button" value="set" onclick="set()"/>
<input type="button" value="get" onclick="get()"/>
</body>
</html>