form.getData 取不到checkboxlist的值 - jQuery MiniUI

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>CheckBoxList</title>
<meta http-equiv="content-type" content="text/html; charset=UTF-8" /><link href="../demo.css" rel="stylesheet" type="text/css" />
<script src="../../scripts/boot.js" type="text/javascript"></script>
</head>
<body>
<h1>CheckBoxList 复选框组</h1>
<div id="editform" class="form" >
<div id="cbl1" class="mini-checkboxlist" repeatItems="3" repeatLayout="table"
textField="text" valueField="id" value="cn,usa"
url="../data/countrys.txt" >
</div>
<input type="button" value="getValue" onclick="getValue()"/>
</div>
<script type="text/javascript">
function getValue() {
var form = new mini.Form("#editform");
var o = form.getData();
var json = mini.encode([o]);
alert(json);
}
</script>
</body>
</html>

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