如何在Java脚本和Ajax中解决此问题如果值正确，则在Ajax中显示一个Alert

Question

I know this is silly Question but i have occurred this error again and again

My Question is php script are send me the right data but when i set the if condition in

success:function(data)

data then show me the one alert if i put the right value and wrong value

This is Js Code

function SetTheAmount_man()
{   //Get
    var member_id = $('#mem_un_id').val();
    // alert(member_id);    

     $.ajax({  
        url:"<?php echo  
        base_url();?>demo_insert.php",  
        data: {member_id:member_id},  
        type: "POST",  
        success:function(data){  
            //alert(data);
            //  alert(member_id);   
            if (data == 'success') 
            {
                alert("123");
            }
            else
            {
                alert("456");
            }
            //window.open('http://www.google.com');

        //alert(data);
     // $("#secheme_interest_value").html(data);  
     }
  });  

}

This is PHP Code demo_insert

if(isset($_POST['member_id']))
{
    $mem_un_id=$_POST['member_id'];
    $sql_in= mysql_query("select mem_un_id,deleted from  phppos_customers where mem_un_id='".$_POST['member_id']."' and deleted='0'");
    //$row = mysql_affected_rows($sql_in);
    $row=mysql_fetch_array($sql_in);

    if($row['mem_un_id']!=''){
        echo "success";
    }else{
        echo "error";
    }

    //echo $row['mem_un_id'];
}

Answer 1

@Deepak Acharya: Use the datatype in you ajax hit and then check if it helps, try all the datatypes available most likely to use

1. text
2. html
3. json

Answer 2

What is the result of alerting the incoming response?
Uncomment this:

//alert(data);

---

Try to change this:

if(data == 'success')
{
alert("123");
} 
else
{
alert("456");
}

to this:

if( data == "success" ) {
  alert("123");
}
if( data == "error" ) {
  alert("456");
}