I have written a JavaScript alert message code it displays the alert message first in both codes 1 and 2 before Html content. What should I do to run the HTML content first and then a javascript code?
Code 1
<!DOCTYPE html>
<html>
<head>
<title>Hello, World !</title>
</head>
<body>
<h1>I am learning JavaScript.</h1>
<div id="Content">
<p>This is a paragraph tag. Here the content of html.</p>
</div>
<script src="text.js"></script>
</body>
</html>
Code 2
<!DOCTYPE html>
<html>
<head>
<title>Hello, World !</title>
</head>
<body>
<h1>I am learning JavaScript.</h1>
<div id="Content">
<p>This is a paragraph tag. Here the content of html.</p>
</div>
<script>
alert(" This is alert message.");
</script>
</body>
</html>
There is a load event, which will fire AFTER the page is loaded. You can listen to the event:
window.addEventListener('load', function() {
console.log('All assets are loaded');
alert ("This is an alert MSG");
})
You can use setTimeout() for this
<html>
<head>
<title>Hello, World !</title>
</head>
<body>
<h1>I am learning JavaScript.</h1>
<div id="Content">
<p>This is a paragraph tag. Here the content of html.</p>
</div>
<script>
setTimeout(()=>{
alert(" This is alert message.")
},2000)
</script>
</body>
</html>
In your first code just put defer attribute as below
<script defer src="text.js"></script>
A script that will be downloaded in parallel to parsing the page, and executed after the page has finished parsing
for more detail refer to the URL
https://developer.mozilla.org/en-US/docs/Web/HTML/Element/script