$.extend($.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"
          }
        }
      });