JSFiddle - React, Tailwind, and code Playground

HTML

<button id="btn_1">btn</button>

JavaScript

function adding() {
  var elm_add = document.createElement('button');
  elm_add.id = "hoge";
  elm_add.textContent='btn added';
  var objBody = document.getElementsByTagName("body").item(0);
  objBody.appendChild(elm_add);
}
var elm = document.getElementById("btn_1");
elm.addEventListener("click", adding, false);


document.addEventListener("click", function(e){
console.log(e);
if (e.target.id==='hoge') {
alert('it works! congraturations!!')
}
});