It is a client-side script that is used to perform the dynamic operation under an HTML Web page. HTML only provides a set of elements and attributes, CSS provides a set of properties and Javascript provides dynamic code, client-side logic development, validation and animation in the HTML web page.
Javascript can be executed in any Web Browser as compare to other scripts.
Syntax of JavaScript:-
We can write JS Code into two different ways:-
1) Under HTML Web page in <head></head> using <script> </script> tag
example of internal JS:-
<!DOCTYPE html>
<html>
<head>
<title></title>
<script type="text/javascript">
alert("welcome in JS");
</script>
</head>
<body>
<h1>Welcome in HTML</h1>
</body>
</html>
2) Create separate file for .js and link under web pages
<script src="filename" ></script>
Create Separate File script.js
alert("welcome in JS");
Create .html file and call .js file under head section
<!DOCTYPE html>
<html>
<head>
<title></title>
<script src="script.js"></script>
</head>
<body>
<h2>Welcome in SCS</h2>
</body>
</html>
Javascript code based on event:-
<!DOCTYPE html>
<html>
<head>
<title></title>
<script type="text/javascript">
function fun()
{
alert("welcome in JS");
document.getElementById("b").bgColor='cyan';
}
</script>
</head>
<body id="b">
<h1>Welcome in HTML</h1>
<input type="button" onclick="fun()" value="Click" />
</body>
</html>
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