Les Scopes en JavaScript

====Scope====

In JavaScript, objects and functions are also variables.

In JavaScript, scope is the set of variables, objects, and functions you have access to.

===Local Scope===

JavaScript has function scope: variables declared within a JavaScript function, become LOCAL to the function and they can only be accessed within the function.

===Global Scope===

A variable declared outside a function, becomes GLOBAL : all scripts and functions on a web page can access it. 

In HTML, the global scope is the window object. All global variables belong to the window object.

===Auto Global Scope===

If you assign a value to a variable that has not been declared, it will automatically become a GLOBAL variable.

This code example will declare a global variable carName, even if the value is assigned inside a function.

<code>

myFunction();

// code here can use carName 

function myFunction() {

    carName = "Volvo";

}</code>