Multiplication (*)
The (*) operator multiplies two numbers.
document.write (1*5); // returns the value 1*5= 5

Division (/)
The (/) operator is use to divide two numbers and return a numeric result.
document.write (100/10); // returns the value 100/10 = 10

Addition (+)
The (+) operator is use to sum two numbers or perform string concatenation.
document.write (7+3); // returns the value 7+3 = 10

Subtraction ()
The () operator used to find the difference between two numbers or to indicate the negative value of a numeric expression.
document.write (107); // returns the value 107 = 3

Modulo division (%)
The (%) operator Divides two numbers and returns the remainder.
document.write (10%2); // returns the value 10%2 = 0
document.write (11%2); // returns the value 11%2 = 1

The (++) and () operators are use to increment or decrement a variable by one.
Increment (++)
a = 10;
a++;
document.write(a); // returns the value 11

Decrement ()
a = 10;
a;
document.write(a); // returns the value 9

Logical And (&&)
The (&&) operator is used to perform the logical conjunction on two expressions. In (A && B) The result is true if both A and B are true.
function MyFunction()
{
var num = prompt("Enter a number between 1 and 10:", "6");
if((num > 5) && (num%2==0))
alert("Your number is bigger than 5 AND an even number");
else
alert("Your number is either not bigger than 5 or not an even number");
}
MyFunction();

Logical OR ()
The () operator performs a logical disjunction on two expressions. In (A  B) The result is true if either A or B (or both) are true.
function MyFunction()
{
var num = prompt("Enter a number between 1 and 10:", "6");
if((num > 5)  (num%2==0))
alert("Your number is either bigger than 5 OR an even number (or both)");
else
alert("Your number is not bigger than 5 and it is not an even number");
}
MyFunction();

Inequality (!=)
In (A != B) the result is true if A is not equal to B.
function MyFunction()
{
var response = prompt("Is 1/2 bigger than 0.4? Enter YES, or NO", "");
if(response!="YES") alert("The correct answer is YES");
else alert("Your answer was YES, and you were right!");
}
MyFunction();

Equality (==)
In (A == B) the result is true if A is equal to B.
function MyFunction()
{
var response = prompt("Is 1/2 bigger than 0.4? Enter YES, or NO", "");
if(response=="YES") alert("Your answer was YES, and you were right!");
else alert("The correct answer is YES");
}
MyFunction();
