我有以下html和JS，但无法让step参数工作几分钟：
<!DOCTYPE html>
<html>
<head>
<title>jQM Complex Demo</title>
<meta name="viewport" content="width=device-width; initial-scale=1.0; maximum-scale=1.0; minimum-scale=1.0; user-scalable=no; target-densityDpi=device-dpi"/>
<link rel="stylesheet" href="http://code.jquery.com/mobile/1.2.0/jquery.mobile-1.2.0.min.css" />
<link rel="stylesheet" href="http://example.gajotres.net/iscrollview/mobiscroll-2.4.custom.min.css" />
<link rel="stylesheet" href="http://www.fajrunt.org/mobiscroll.custom-2.5.1.min.css"/>
<script src="http://code.jquery.com/mobile/1.2.0/jquery.mobile-1.2.0.min.js"></script>
<script src="http://example.gajotres.net/iscrollview/mobiscroll-2.4.custom.min.js"></script>
</head>
<body>
<div data-role="page" id="index">
<div data-theme="a" data-role="header">
<h3>
First Page
</h3>
</div>
<div data-role="content">
<input name="demo" id="demo" class="i-txt" />
</div>
</div>
</body>
</html>
这是给我提问的JS代码：
$(function(){
$('#demo').mobiscroll().time({
display: 'inline',
mode: 'scroller',
steps: {
minute: 15,
zeroBased: true
}
});
});