<html>
<body>
<h1>JavaScript Promise Object</h1>
<h2>The then() Method</h2>
<p>Wait 3 seconds (3000 milliseconds) for this page to change.</p>
<h1 id="demo"></h1>
<script>
const myPromise = new Promise(function(myResolve, myReject) {
setTimeout(function(){ myResolve("I love You !!"); }, 3000);
});
myPromise.then(function(value) {
document.getElementById("demo").innerHTML = value;
});
</script>
</body>
</html>