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JavaScript Tutorial

JS Introduction
JS Variables
JS Operators
JS Data Types
JS Decision
JS Loops
JS Objects
JS Function
JS Events
JS Cookies
JS Date/Time
JS HTML DOM
JS Browser
JS CSS
JS Error

Javascript Variables

Variables are used to store values.Before you use a variable in a JavaScript program, you should declare it. Variables are declared with the var keyword.

Syntax

var variableName;

var variableName = value;

Example of Variable

var m;
var v = "HELLO JAVASCRIPT";
var i = 0, j = 0, k = 0;
var i = 13, j = 2, k = 432.42;

Variable Scope

It is the place where you can defined and use a variable. Variable Scope are of two types Global Variable, Local Variable.

Global Variable: global variables are those variables which is defined anywhere in your javascript code and you can use that variable wherever you want.

Local Variable: local variables are those variables which is defined within a javascript function and you can use that variable only in that function.You cannot use that variable outside from that function.

Example of Global Variable

var v=24;

Example of Local Variable

function demo()
{
var v=24;
}

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