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Assignement (=) - JavaScript | MDN
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Cette page a été traduite à partir de l'anglais par la communauté. Vous pouvez contribuer en rejoignant la communauté francophone sur MDN Web Docs.
Assignement (=)
Baseline
Widely available
This feature is well established and works across many devices and browser versions. It’s been available across browsers since juillet 2015.
L'opérateur d'assignement simple (=) est utilisé pour définir la valeur d'une variable. Il est possible d'ajouter une valeur à plusieurs variables en chaînant les variables.
Exemple interactif
let x = 2;
const y = 3;
console.log(x);
// Expected output: 2
console.log((x = y + 1)); // 3 + 1
// Expected output: 4
console.log((x = x * y)); // 4 * 3
// Expected output: 12
Syntaxe
js
x = y;
Exemples
Assignement simple et variables en chaînes
js
// On considère les variables suivantes :
var x = 5;
var y = 10;
var z = 25;
x = y;
// x est égale à 10
x = y = z;
// x, y et z sont égales à 25
Spécifications
| Specification |
|---|
| ECMAScript® 2026 Language Specification # sec-assignment-operators |
Compatibilité des navigateurs
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