Welcome to Unisomnia Fremox Blog | Blog d’un graphiste indépendant Le Jardin de JavaScript Bien que JavaScript utilise une syntaxe avec accolades pour les blocs, il ne crée pas de portée "scope" de bloc; par conséquent, la seule portée du langage est la portée de fonction. function test() { // une portée "scope" for(var i = 0; i < 10; i++) { // pas une portée // count } console.log(i); // 10} Il n'existe pas d'espaces de noms "namespaces" en JavaScript, ce qui signifie que tout est défini dans un espace de noms commun partagé par tous. Chaque fois qu'une variable est référencée, JavaScript va traverser vers le haut toutes les portées jusqu'à ce qu'il la trouve. S'il atteint la portée globale sans avoir trouvé le nom demandé, il va générer une erreur de référence ReferenceError. Le fléau des variables globales // script Afoo = '42'; // script Bvar foo = '42' Les deux scripts ci-dessus n'ont pas le même effet. Ne pas utiliser var peut avoir des répercussions majeures. // portée globalevar foo = 42;function test() { // portée locale foo = 21;}test();foo; // 21 Variables locales test();
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