April 16th, 2014
Variables store values such as text, numbers, or objects. Variables are either declared and then later set, or can be set when they are declared.
var myNumber; //declaring but not setting var myNumber = 93;//setting when you declare
You can set variables like so:
var myNumber = 1;
var welcomeMessage = 'This is a string';
Variables can also be HTML objects by using document.getElementById.
var header = document.getElementById("header");
Where the part in quotes is the id of the object you want to access.
You can set part of your HTML to a variable’s value by using the document.innerHTML command.
(note this uses getElementById, which we will get into better detail later)
In addition, variables can even be other variables combined.
var y = 1;
var z = 2;
var x = y + z;
x would equal 3.