xxxxxxxxxx
<input type="button" value="Button Text Here">
xxxxxxxxxx
const btn = document.getElementById("btn");
btn.addEventListener("click", ()=>{
if(btn.innerText === "Red"){
btn.innerText = "Blue";
}else{
btn.innerText= "Red";
}
});
xxxxxxxxxx
<input onclick="change()" type="button" value="Open Curtain" id="myButton1"></input>