javascript在localhost上工作正常，但在实时服务器上却不能

Question

i have a comment system in php,ajax and javascript this code used to work fine in localhost but when i transfered my website to live server it does not work idk why this is my script

 <script type="text/javascript">
$(document).on('click','.submit',function(e){
     e.preventDefault();
     $post = $(this);
    var username2 = $(this).parent().find("#username").val();
    var comment2 = $(this).parent().find("#comment").val();

    $commentsec = $(this).closest("form").next(".comments");

    //Get values of input fields from DOM structure 
    var dataString = {
        id: $(this).parent().find("#id").val(),
        username: $(this).parent().find("#username").val(),
        uid: $(this).parent().find("#uid").val(),
        comment: $(this).parent().find("#comment").val()
    };
   //Get values of input fields from DOM structure 



    $.ajax({
   url:'comments.php',  
   data:dataString,
   success:function(){
$commentsec.append('<p class="written"><a href="users.php?id= <?php echo $id3; ?>"><b style=color:black !important>'+username2+'</b> </a>'+comment2+"</p>"+'<div class="dropdown"><img src="images/ellipsis.png" class="dots"><div class="dropdown-content"><br><p  class="delete" data-delete=<?php echo $commentid; ?>">delete</p></div></div>');
     $(" #comment").val("");     
   }
   });
});

is there any way i can get error in my error log??

this is my network tab network tab

console tab

Answer 1

For you php error check

ini_set('display_errors', 1);
ini_set('display_startup_errors', 1);
error_reporting(E_ALL);

You can check any kind of your javascript error by inspect your browser and go to your console and debug with console.log

Hope this will help you

Answer 2

1. open Developer Tools

2. Go to Network tab

try to look for 'comments.php' ... If 'comments.php' appears in red text, it means the url you provide is returning ERROR (or the URL is invalid)