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Variable Declaration

The JavaScript var statement declares a JavaScript variable. Optionally, you can use the = assignment operator to initialize a variable at the same time that you create it. The JavaScript variable definition uses the following syntax:

var variable_name [= initial_value];

The following lines create variables but leave the initial values undefined until subsequent code assigns values to them:

var x
var s

You can initialize a variable as either an integer or a string. In the following example, x is initialized as an integer and s is initialized as an empty string.

var x = 0
var s = ""

You can create multiple variables in a single statement:

var i = 0, j = 0, k = 0