jq页面加载完后按钮延迟5s才能点击

<!DOCTYPE html>
<html>
    <head>
        <meta charset="UTF-8">
        <title>按钮倒数5秒后才能点击</title>
    </head>
    <script src="http://libs.baidu.com/jquery/2.0.0/jquery.min.js"></script>
    <body>
        <button type="button" id="test" disabled>点击</button>
    </body>
    <script type="text/javascript">
        setTimeout(function(){
            $("button[id='test']").removeAttr("disabled");
        },5000)
    </script>
</html>