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

JavaScript variables have 3 types of scope: Block scope. Function scope. Global scope. Block Scope. Before ES6 (2015), JavaScript variables had only Global Scope and Function Scope. ES6 introduced two important new JavaScript keywords: let and const. These two keywords provide Block Scope in JavaScript.

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

Is it possible to define a global variable in a JavaScript function? I want use the trailimage variable (declared in the makeObj function) in other functions.

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

Any JavaScript variable defined outside any function is a global variable, but that comes with caveats for Node.js and Webpack. Here's what you need to know.

https://javascript.info › global-object

The global object holds variables that should be available everywhere. That includes JavaScript built-ins, such as Array and environment-specific values, such as window.innerHeight – the window height in the browser. The global object has a universal name globalThis.

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

JavaScript defines variables of global or local scope: Variables with global scope are available from all other scopes within the JavaScript code. Variables with local scope are available only within a specific local context and are created by keywords, such as var, let, and const.

https://www.w3schools.com › js › tryjs_local_global.htm

JavaScript Global Variables. If you assign a value to a variable that has not been declared, it will automatically become a GLOBAL variable: I can display Volvo

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";