JavaScript Syntax

Declare variables [var is lower case]
var cust;
var balance;

Declare on one line.
var cust, balance;

Declare and assign values together.
var cust = "Smith, John";
var balance = 456.30;
var totdue = price * .06;

Relational Operators

less than<
less than or equal to<=
greater than>
greater than or equal to>=
equal==
not equal (!=)

Logical Operators

AND &&
OR ||
NOT !

Arithmetic Operators

ADD +
SUBTRACT-
MULTIPY *
DIVIDE /
MODULO %
INCREMENT++
DECREMENT--

Escape Sequences

Backspace \b
Form feed\f
New line\n
Carriage return \r
Single quote \'
Double quote \"
Single backlash \\

Assignment Operators

Operator	Example	Process	Description
=	a=b	a=b	Assign
+=	a+=b	a=(a+b)	Add value then assign
-=	a-=b	a=(a-b)	Subtract value then assign
*=	a*=b	a=(a*b)	Multiply value then assign
/=	a/=b	a=(a/b)	Divide value then assign
%=	a%=b	a=(a%b)	Modulus value then assign

if (expression) do this;

var totalnum = 5;
if (totalnum > 0) alert ("The number is " + totalnum; )

OR

var totalnum = 5;
if (totalnum > 0)
{
alert ("The number is " + totalnum; )
}

if (expression) do this ; else do this ;

var totalnum = 5;
var bool;
if (totalnum > 0)
{
bool == true;
}
else
{
bool == false;
}

if (expression) do this ; else if (expression) do this ;

var totalnum = 5;
var bool;
if (totalnum > 0)
{
      bool == true;
}
else if (totalnum < 0)
{
     bool == false;
}
else
{
     alert('The amount is 0')
}

Javascript in HTML

<script language="javascript" type="text/javascript">

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Javascript Syntax

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