通过寻求CommonJS支持 ，这是Underscore.js库的实现方式：

编辑：对您的更新问题：

(function () {

    // Establish the root object, `window` in the browser, or `global` on the server.
    var root = this;

    // Create a reference to this
    var _ = new Object();

    var isNode = false;

    // Export the Underscore object for **CommonJS**, with backwards-compatibility
    // for the old `require()` API. If we're not in CommonJS, add `_` to the
    // global object.
    if (typeof module !== 'undefined' && module.exports) {
            module.exports = _;
            root._ = _;
            isNode = true;
    } else {
            root._ = _;
    }
})();

这里的示例保留了Module模式。