/**
* @author yukaizhao
*/
$.extend($.fn.validatebox.defaults.rules, { 
/*必须和某个字段相等*/
equalTo: {
validator:function(value,param){
return $(param[0]).val() == value;
},
message:'字段不匹配'
}
}); 

<input id="password" name="password" validType="length[4,32]" class="easyui-validatebox" required="true" type="password" value=""/>
<br/>

<input type="password" name="repassword" id="repassword" required="true" class="easyui-validatebox" validType="equalTo['#password']" invalidMessage="两次输入密码不匹配"/>