JSFiddle - React, Tailwind, and code Playground
HTML
<div id="allofers">0</div>
JavaScript
var allofers = document.getElementById('allofers'),
offers = 1;
var addOne = 0;
allofers.onclick = function(){
if (offers >1){
addOne++;
console.log(addOne);
allofers.innerHTML= '+'+addOne;
} else {
addOne--;
console.log(addOne);
allofers.innerHTML= addOne;
}}