$.extend($.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' 
 } 
    
}); 

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

$("#aspnetForm").validate({
    rules: {
     txtName: {
      required: true
     },
     txtTrueName: {
      required: true
     },
     txtPass: {
      required: true,
      minlength: 3
     },
     txtTwoPass: {
      required: true,
      minlength: 3,
      equalTo: "#txtPass"
     },
     txtEmail: {
      required: true,
      email: true
     },
     txtAddress: {
      required: true
     },
     txtPhone: {
      required: true
     }
    },
    messages: {
     txtName: {
      required: "*请输入用户名"
     },
     txtTrueName: {
      required: "*请输入姓名"
     },
     txtPass: {
      required: "*请输入密码",
      minlength: "*密码不能小于3个字符"
     },
     txtTwoPass: {
      required: "*请输入确认密码",
      minlength: "*密码不能小于3个字符",
      equalTo: "*请再次输入相同的值"
     },
     txtEmail: {
      required: "*请输入邮箱",
      email: "*请输入正确的邮箱格式"
     },
     txtAddress: {
      required: "*请输入地址"
     },
     txtPhone: {
      required: "*请输入手机号码"
     }
    }
   });