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Eight: Understand the policy pattern in javascript两只憨憨的、可爱的企鹅兄弟，生活在南极冰原上。他们有一座冰屋，面朝大海。他们一个高，一个矮。一个戴一顶绿帽子，一个戴一顶红帽子。他们热爱生活，热爱音乐，对生活充满好奇心。在孤独的冰原，每天都上演着让人捧腹的故事！Reference: QQ Flying Car-Baidu Encyclopedia? Singleton pattern is the most common and simplest design pattern in design pattern, which ensures that only one instance exists in the program and can be accessed globally. For example, account information object management used in actual APP development? Objects (SQLiteOpenHelper) and so on all use singleton mode. This model has several advantages:During that time, Huang Weiping and Ding Rui often ran to funeral parlors and crematoria. They became friends with the mortician. It was also specially approved by the Shanghai Ministry of Civil Affairs to lie down in a real incinerator. For the first time, the incinerator in the crematorium "burned" the living.