JSFiddle - React, Tailwind, and code Playground

HTML

<button type="button" id="1" onclick=""></button>
<button type="button" id="2" onclick=""></button>
<button type="button" id="3" onclick=""></button>

JavaScript

function location0() {
  equip = ["Spada", "Corda", "Acciarino"]
  for (let i = 1; i < 4; i++) {
    document.getElementById(i).innerHTML = equip[i - 1]
    document.getElementById(i).addEventListener('click', ()=>{addinv(i)})
  }
}
location0();
function addinv(j){
	console.log(j)
}