JavaScript variables hold a wide variety of information and can be used with virtually any data type. Here's how to use variables to store numbers, text strings, objects, and more.

Nowadays JavaScript has three different keywords to declare a variable — var, let and, const. Each has its own properties and particularities. Let’s start by making a simple comparison table ...

Type "var countSelected = document.getElementById("lbcontents").options.length;" in your code to create a new variable ("countSelected") that is set to the number of elements in the listbox ...

- Element is the most general base class from which all objects in a Document inherit. - It only has methods and properties common to all kinds of elements. - More specific classes inherit from ...

Before you say it, yes I know about cookies. The problem I have is I need to keep a LOT of numbers between refreshes, and was wondering if there is some way to mark an array variable as unrefreshable.

This happens even if the variable is assigned a value and becomes a global. I have two questions about this behavior, which is why I am opening this issue. Is this expected, reasonable behavior? The ...