https://www.delftstack.com › fr › howto › javascript › javascript-global-variable

Ce didacticiel explique comment déclarer des variables globales dans JavaScript. Les variables contiennent les données et les informations, qui peuvent être modifiées à tout moment. En JavaScript, les variables peuvent être déclarées à l’aide de mots-clés tels que const , let et var .

https://stackoverflow.com › questions › 5786851

As the others have said, you can use var at global scope (outside of all functions and modules) to declare a global variable: <script> var yourGlobalVariable; function foo() { // ... } </script> (Note that that's only true at global scope.

https://www.w3schools.com › js › js_scope.asp

Automatically Global. 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.

https://www.geeksforgeeks.org › how-to-declare-global-variables-in-javascript

In JavaScript, you can declare global variables by simply declaring them outside of any function or block scope. Variables declared in this way are accessible from anywhere within the script. Here’s how you declare global variables: // Declare global variables outside of any function or block scope. var globalVar1 = "Hello";

https://masteringjs.io › tutorials › fundamentals › global-variable

So here's how you can declare a global variable with Webpack: global.answer = 42; Automatic Global. If you assign to an variable that you didn't define using let, const, or var outside of strict mode, that automatically becomes a global variable. function { answer = 42; // `answer` becomes global scoped in the browser, or file scoped in Node.js}

https://developer.mozilla.org › en-US › docs › Web › JavaScript › Reference › Statements › var

The var statement declares function-scoped or globally-scoped variables, optionally initializing each to a value.

https://developer.mozilla.org › fr › docs › Web › JavaScript › Reference › Statements › var

Si on affecte une valeur à une variable qui n'a pas été déclarée (le mot-clé var n'a pas été utilisé), cela devient une variable globale (une propriété de l'objet global) lorsque l'affectation est exécutée. Les différences entre les variables déclarées et les variables non-déclarées sont :

https://web.dev › articles › global-and-local-scope

Use the var, const, or let keywords to declare local or global-scope variables. Use the const or let keywords to declare block-scope variables. When you declare a var variable in a function, the declaration makes the variable available to the nearest enclosing function.

https://www.geeksforgeeks.org › javascript-global-variables

JavaScript Global Variables can be accessed outside any function or block. They are declared within the window object or outside any block or scope. A variable declared without a keyword is also considered global even though it is declared in the function.