Class notes

Java script for begginers

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Course
Java script

Institution
Java Script

JavaScript is a programming language that enables you to create dynamic, interactive web pages. JavaScript is easy to learn for beginners and has many advanced features for experienced programmers. This tutorial will teach you the basics of JavaScript, including how to write code, execute scripts, ...

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Uploaded on February 25, 2023
Number of pages 10
Written in 2022/2023
Type Class notes
Professor(s) Sudha agarwal
Contains All classes

java script begginers
java script course

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INDEX

Introduction JS Math

JS Syntax JS Dates

JS Statement JS Arrays

JS Comments JS Comparisons

JS Variables JS Conditions

JS Operators JS Loops

JS Arithmetic JS Type Conversion

JS Data Types JS Regular Expressions

JS Functions JS Debugging

JS Objects JS Hoisting

JS Scope JS Strict Mode

JS Events JS Forms

JS Strings JS Objects

JS Numbers JS DOM

JS Browser BOM

WHAT IS JAVASCRIPT
JavaScript is:
Is a lightweight, interpreted programming language.
used to create interactive effects within web browsers.
Designed for creating network-centric applications
Complementary to and integrated with Java
Complementary to and integrated with HTML
Open and cross-platform
JAVASCRIPT SYNTAX
A JavaScript consists of JavaScript statements that are placed
within the <script>... </script> HTML tags in a web page.

, The <script> tag alert the browser program to begin interpreting all the text between these tags
as a script. So simple syntax of your JavaScript will be as follows
JAVASCRIPT IN <HEAD> OR <BODY>
Scripts can be placed in the <body>, or in the <head> section of
an HTML page, or in both.

External JavaScript:
Scripts can also be placed in external files.
External scripts are practical when the same code is used in
many different web pages.
JavaScript files have the file extension .js.
<!DOCTYPE html>
<html>
<head>
<script src="firstScript.js"></script>
</head>
</html>
EXTERNAL JAVASCRIPT ADVANTAGES
Placing JavaScript in external files has some advantages:

It separates HTML and code
It makes HTML and JavaScript easier to read and maintain
Cached JavaScript files can speed up page loads

JAVASCRIPT FUNCTIONS AND EVENTS
A JavaScript function is a block of JavaScript code, that can be
executed when "asked" for.

For example, a function can be executed when an event occurs,
like when the user clicks a button.
SEMICOLONS ARE OPTIONAL
Simple statements in JavaScript are generally followed by a
semicolon character, just as they are in C, C++, and Java.

JavaScript, however, allows you to omit this semicolon if your statements are each placed on a
separate line. For example, the following code could be written without semicolons

<script language="javascrip”>
<!–
var1 = 10 var2 = 20
//--> </script>

CASE SENSITIVITY
JavaScript is a case-sensitive language. This means that language keywords, variables,
function names, and any other identifiers must always be typed with a consistent capitalization
of letters.

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