ON?OFF
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
</head>
<body>
<button id="btt" onclick="but()" > ON</button>
<img id="light" src="https://www.w3schools.com/js/pic_bulboff.gif" alt="">
<!-- <img src="https://www.w3schools.com/js/pic_bulbon.gif" alt=""> -->
</body>
<script>
function but(){
const elemnt = document.getElementById("btt");
const bulp = document.getElementById("light");
if(elemnt.innerText == "ON"){
elemnt.innerText="OFF";
bulp.src = "https://www.w3schools.com/js/pic_bulbon.gif";
}else {
elemnt.innerText="ON";
bulp.src = "https://www.w3schools.com/js/pic_bulboff.gif";
}
console.log(elemnt.innerText);
}
</script>
</html>
Output
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