Variables are global
if
created outside a
function
.
Variables are local
if
created inside a
function
. Use
var
to create a local variable
of the same name as a global variable
It
's allowed to have a global and local variable of the same name.
If a local variable by the same name of a global variable is required, the
var
declaration must be used inside the
function
, otherwise
references to the variable will refer to the global variable.
Functions are always global (can be accessed from any JavaScript on the page)
