JSFiddle - React, Tailwind, and code Playground

HTML

<a href="#" id="btn_1">Btn1</a>
<a href="#" id="btn_2">Btn1</a>
<a href="#" id="btn_3">Btn1</a>
<a href="#" id="btn_4">Btn1</a>

JavaScript

for(i = 0; i < 5; i++) {
    $("#btn_"+i).click({ counter: i }, function(e) {
        alert(e.data.counter);                                 
    });
}