<p id="js-text">これはHTMLにかいてあるテキストです</p>
<button id="js-button">押してね！</buttton>
const button = document.getElementById("js-button");
const text = document.getElementById("js-text");
const changeText =()=>{
 　text.textContent="→ DOMがテキストを書き換えました！"
}
button.addEventListener("click", changeText);

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