JavaScript is a scripting language that
is lightweight, open source and cross-platform.
Uses
JavaScript is a case-sensitive language.
It is object oriented
language because it supports OOPS(object oriented programming system).
Extension of JavaScript is .js
Uses
JavaScript is used to
create interactive websites.
It is used for Client-side
validation.
It is used for Displaying
popup windows and dialog boxes (like alert dialog box, confirm dialog box and
prompt dialog box)
Example:
<script>
document.write("Welcome to
LearningPoint92");
</script>
OR
<script type="text/javascript">
document.write("Welcome to LearningPoint92");
</script>
Note:
Script : We have to write all data in
Script tag when we are using JavaScript
text/javascript: It is the content type
that provides information to the browser about the data.
document.write() function is used to
display the output .
Where to put JavaScript code
1. Between the body tag of
html
2. Between the head tag of
html
3. external
javaScript
Between
the body tag of html
<html>
<body>
<script
type="text/javascript">
alert("Hello LearningPoint92");
</script>
</body>
</html>
Between
the head tag of html
<html>
<head>
<script type="text/javascript">
function display(){
alert("Hello LearningPoint92");
}
</script>
</head>
<body>
<p>Heyy </p>
<form>
<input type="button" value="click" onclick="display()"/>
</form>
</body>
</html>
External
JavaScript:
Here we have to create separate JavaScript file (demo.js)
Index.html
<html>
<head>
<script type="text/javascript" src="demo.js"></script>
</head>
<body>
<p>Welcome to LearningPoint92 </p>
<form>
<input type="button" value="click" onclick="display()"/>
</form>
</body>
</html>
demo.js
function display(){
alert("Hello users");
}
Comments
Comments are not executed by compiler.
Comments are used to highlight the statements.
You can explain code, variable, method, object, property or class but not execute the code.
There are two types of comments in PHP.
· Single Line comment (//)
· Multi Line comment (/∗ ..... ∗/).
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