自己写的一个很绕的Js 运用 prototype和allay

var qq = {};
qq.extend = function (first, second) {
    for (var prop in second) {
        first[prop] = second[prop];
    }
};
qq.FileUploaderBasic = function (o) {
    this._options = {
        data: false,
        url: false,
        msg: { typeerror: "类型错误",
            sizeerror: "大小错误",
            maxfile: "限额错误"
        }
    };
    qq.extend(this._options, o);
    this._handler = this._CreateUploadHandle();
    this._button = this._CreateButton();
    // this._preventLeaveInProgress();
};

qq.FileUploader = function (o) {
    qq.FileUploaderBasic.apply(this, arguments);

    qq.extend(this._options, {
        element: null,
        template: "<div></div>"
    });
    qq.extend(this._options, o);

    this._element = this._options.element;
    this._template = this._options.template;

};

qq.UploadHandlerForm = function (o) {
    //复杂没写
};
qq.UploadHandlerForm.prototype = {
    upload: function (id, params) {
        this._upload();
    }
};

qq.extend(qq.UploadHandlerForm.prototype, {
    _upload: function (id) {
        alert("upload");
    }
});

qq.FileUploaderBasic.prototype = {
    _CreateUploadHandle: function () {
        var handlerClass, self = this;
        handlerClass = "UploadHandlerForm";
        var _handler = new qq[handlerClass]() || {};
        return _handler;
    },
    _CreateButton: function () {
        var self = this;
        var input = document.createElement("input");
        input.setAttribute("type", "button");
        input.setAttribute("id", "inputfile");
        $(input).click(function () {
            self._handler.upload();
        });
        $(document.body).append($(input));
        return input;
    },
    _preventLeaveInProgress: function () { }

};
qq.extend(qq.FileUploader.prototype, qq.FileUploaderBasic.prototype);
qq.extend(qq.FileUploader.prototype, {

    /**
    * delegate click event for cancel link 
    **/
    _bindCancelEvent: function () {

    }
});