JSFiddle - React, Tailwind, and code Playground

HTML

<button>Показать еще</button>

JavaScript

let button = document.querySelector("button");
let shown = false;

button.addEventListener("click", event => {
  if (shown) {
  	button.textContent = "Показать еще";
  } else {
  	button.textContent = "Скрыть";
  }
  
  shown = shown ? false : true;
}, false);