jquery-php jQuery for no-refresh validation issues

Phpjquery

Front-end to achieve: focus out of the input box, automatically to verify the card coupons, and the validation results no refresh back to the Prompt box

Now the problem is that the page code in the foreground

     $(document).ready(function(){       //DOM的onload事件处理函数          $("#button").click(function(){   //当按钮button被点击时的处理函数            postdata();                    //button被点击时执行postdata函数          });       });       function postdata(){            //提交数据函数          $.ajax({                     //调用jquery的ajax方法            type: "POST",              //设置ajax方法提交数据的形式            url: "checkCard.php",             //把数据提交到checkCard.php            data: "codeno="+$("#codeno").val(),  //交的数据            success: function(msg){     //提交成功后的回调，msg变量是checkCard.php输出的内容。              $('check').innerHTML+=msg;            //alert("数据提交成功");    //如果有必要，可以把msg变量的值显示到某个DIV元素中            }          });       

Front display area:

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is not successful Ah, detailed visible
http://bbs.csdn.net/topics/391014234?page=1#post-399081723
Thank you

