easy-ui表单（提交后）一一验证

<script>
function submitForm2(){
$('#nn').numberbox({
required: true,
min:0,
precision:2
});
$('#ff2').form('submit');
}
</script>

<form id="ff2" method="post">
<input class="easyui-numberbox" id="nn" type="text" name="email" ></input>
<div style="text-align:left;padding:5px">
<a href="javascript:void(0)" class="easyui-linkbutton" onclick="submitForm2()">Submit</a>
</div>
</form>