javascript - How to make JS be called only once for all pages? -


i have header.html page keep loading dynamically javascript webpages via add_header.js.

the header.html includes notification badge shows red span number of notifications.

in add_header.js have js function removes red span when badge clicked.

everything works great 1 page, when go other page, header.html gets loaded again notification red again.

how can fix this, in order function executed 1 time pages?

webpage.html

<script src="js/add_header.js"></script>  <div id="header"> </div>

my header.html

<div class="bootstrap-iso">   <li class="nav-item d-md-down-none">     <a id="notif-link" class="nav-link" href="#" title="notifications">      <span id="notif" class="badge badge-pill" style="background-color:red;"></span>     </a>   </li> </div>

my add_header.js

$(function(){   $("#header").load("header.html");  });  $(document).ready(function(){  var list_notif=["notification1","notification2","notification3","notification4"];  var number_notif=list_notif.length;  $('#notif').text(number_notif);   $('#notif-link').focus(     function(){       $('#notif').remove();      });  });


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