aっていれるとapple,action,archive,antがでる。
index.html
<!DOCTYPE html>
<html lang="ja">
<head>
<title></title>
<link href="css/bootstrap.min.css" rel="stylesheet">
</head>
<body>
<div class="container">
<input type="text" class="span3" data-provide="typeahead" data-items="4" data-source='["apple", "action", "archive", "ant"]'>
</div>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.7.1/jquery.min.js"></script>
<script src="js/bootstrap.min.js"></script>
</body>
</html>