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虎子和黑娃都悄悄地笑起来。Whether it is file uploading, music or video players, some obvious state distinctions can be found. For example, there are several states in the file upload program: scanning, uploading, pausing, uploading successfully and uploading failed. The music player can be divided into several states: loading, playing, pausing and playing after. When clicking the same button, the behavior in upload and pause states is different, and their style class is also different.The policy mode is the packaging of the algorithm, which separates the responsibility of using the algorithm from the algorithm itself and delegates it to different objects. Policy patterns usually wrap a series of algorithms into a series of policy classes. To encapsulate the policy pattern in one sentence is to "encapsulate each algorithm into a different policy class so that they can be interchanged". The following is the structure diagram of the policy mode:讲述了东汉王朝开国皇帝刘秀和皇后阴丽华在云台二十八将帮助下创建伟业的故事。新朝年间，刘秀于长安太学求学之时，结识了邓禹、刘玄、冯异等少年才俊及童年的阴丽华，数年后，新莽暴政，天下大乱。由于王莽的残暴，刘秀随兄长刘縯揭竿而起，阴丽华亦乔装化名阴戟，追随左右。从舂陵起义到昆阳大战，刘秀与一众肝胆相照的同袍并肩作战，浴血沙场。孰料刘玄称帝后，忌惮刘家兄弟功高，诛杀刘縯。刘秀娶阴丽华为妻，韬光养晦，使刘玄放松警惕，放其持节北上，重振旗鼓。河北之路危机重重，幸有邓禹、冯异、吴汉、耿弇等旧故新知先后来投，患难与共。河北真定王刘扬提出联姻结盟，为顾全大局，刘秀忍痛与妻子分离。之后，刘秀联手邓禹、冯异，经数十载不懈努力，结束战乱，平定河北等地，以洛阳为都，复兴大东汉王朝，终成夙愿，使大汉帝国延续二百多年。Episode 29君望域古羿国，秦家养子秦问天自幼羸弱，秦府被迫将其送入白府联姻，自小寄人篱下，后白家为攀附皇城叶家悔婚，更欲取秦问天性命，他逃出生天，恰逢皇室巨变，羿王长期重症昏迷，摄政王羿横欲夺权篡位，将忠烈之后秦家被冠以莫须有罪名，满门抄斩，残余秦氏子弟逃于西北之上，秦父等被收押至皇城监牢，而秦问天躲过一劫，并立誓要救出父亲妖拔除奸佞，重整羿国。期间，秦问天结识挚友凡乐、若欢等人，加入武学名派九华门，却意外得知落难太子羿无为正藏于九华门中，秦问天与莫家长孙女莫倾城一同守护羿无为，他睿智机敏，周旋于羿天骄的威逼利诱和爷爷秦昊的腹黑心机之间，跨过诡谲变幻的风云迷雾，每每总能化险为夷，最终辅佐明君羿无为登上皇位，此后秦问天淡泊名利心如止水，与莫倾城一同留在九华门守护羿国。