JavaScript回調函數問題

Question

請參閱下面的代碼：

        var callback = function(popup_window) {
            popup_window.close();
           //some more codes here
        };
        var prepare = function(cb) {
            popup_window = window.open("my_url");
            this.cb(popup_window);
        };
        function refresh(){
            prepare(callback);
        };

如何將popup_window變量傳遞給回調函數？

Answer 1

改變this.cb(popup_window); 到cb(popup_window);

Answer 2

 var prepare = function(cb) {
        var popup_window = window.open("my_url");
        cb(popup_window);
    };

Answer 3

用cb()替換this.cb() cb()