Website Building → Tutorials → Javascript: Strings and Variables (Part 3)

Strings are blocks of text, e.g. 'made of cheese'. Variables are numbers, like '15' or '200'.

Defining and calling variables:

<script>
a=1;
b=2;
c=a+b;
alert(c);
</script>

Arithmetic Operators

Arithmetic operators work on one or more numeric values yielding a single result.

• +     Addition
• -     Subtraction
• *     Multiplication
• /     Division
• %     Modulus
• ++     Increment by 1
• --     Decrement by 1

What is Modulus?

The JavaScript Modulus Arithmetic operator returns the remainder left after division.

var a = 70 % 16;

(a is now equal to 4, since the remainder left after dividing 70 by 16 is 4)

var b = 64 % 8;

(b equals 0)

Strings

Text must be stored as a string:

<script>
var name = "Cristiano Ronaldo";
var club = 'Manchester United';
var position = "Attacking Midfielder/Forward left";
var squad_number = "7";
</script>

→ Forms →

0. Introduction
1. Part 1: Further Introduction
2. Part 2: Basic Implementation
3. Part 3: Strings & Variables
4. Part 4: Forms
5. Part 5: Login Script