JSFiddle - React, Tailwind, and code Playground

HTML

<div id="arr">
    <div class="test">sdvsdvsdv</div>
    <div class="test">4349567294</div>
</div>

<div id="result">

</div>

CSS

#result {
    margin-top: 20px;
    border-top: 2px solid #ccc;
    padding-top: 10px;
}

JavaScript

var test_items = document.getElementsByClassName("test");
var result = document.getElementById("result");

for (var i = 0; i < test_items.length; i++) {
	test_items[i].addEventListener("click", function () {
    	result.innerHTML = this.innerHTML;
    }, false);
}