JSFiddle - React, Tailwind, and code Playground

by guyyar

HTML

<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>
<a href="https://www.banggood.com/VIOFO-A119-1440P-160-Degree-Wide-Angle-Car-DVR-With-GPS-Black-p-1068196.html" class="btn_offer_block re_track_btn" target="_blank" rel="nofollow">banggood</a>
<br>
<br>
<br>
<a href="http://www.gearbest.com/robot-vacuum/pp_615997.html" class="btn_offer_block re_track_btn" target="_blank" rel="nofollow">gearbest</a>

JavaScript

var myRef=jQuery("a.btn_offer_block").attr("href");
if(myRef.indexOf("banggood")!="-1"){
myRef+="?p=BQ06121739480201506E";
}
else if(myRef.indexOf("gearbest")!="-1"){
myRef+="1234";
}
jQuery("a.btn_offer_block").attr("href",myRef);