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Javascriptで階層を持った名前空間を定義する関数

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function namespace(ns) {
    var names = ns.split('.');
    var parent = window;

    for (var i = 0, len = names.length; i < len; i++) {
        parent[names[i]] = parent[names[i]] || {};
        parent = parent[names[i]];
        console.info(parent);
    }
    return parent;
}

// 実行確認
var aaa = namespace('Hoge.Fuga');
aaa.Piyo = function () {};
var bbb = new aaa.Piyo;
console.info(bbb instanceof Hoge.Fuga.Piyo);

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