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://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://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://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://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://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:

https://www.freecodecamp.org › news › scope-in-javascript-global-vs-local-vs-block-scope

Global scope in JavaScript is like the town square where everyone can access and modify variables. While it provides broad visibility, it should be used judiciously to maintain code clarity and prevent unintended side effects.

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.