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Therefore, learning design patterns, The first thing to do is to understand which aspects of design patterns are available to developers, Then, the principle, timing and method of each design pattern are studied respectively, that is to say, under what circumstances should a certain design pattern be used? When understanding the timing of a certain design pattern, it is also necessary to understand what consequences will be caused if this design pattern is not used at this time. After understanding the principle and usage of each pattern, more importantly, learning the object-oriented thinking mode, after mastering the object-oriented thinking mode, looking back at the design pattern, you will have a deeper understanding. Finally, learning the design pattern, you must study hard and practice more. "I agree with the last sentence very much."一面小心四处搜寻，一面屏息凝神听树林里的动静。不过想想，陈启还是否定了。Test Scenario 2: Loop to the target page (SecondActivity sets singleInstance)　　“Halt and catch fire”是一个早期电脑指令，执行后使计算机进入竞争状态。创新与探索，挑战与机遇，自负与贪婪，乔·麦克米伦，将引领这家不起眼的小公司，成为奔腾年代的新领头羊。Second, Uncaught TypeError: Reduction of empty array with no initial value其他诸人都在上房喝茶闲谈，因五柳先生对玄武王印象甚好，忍不住来到后院对他道：王爷这时候还有心情看戏？板栗微笑道：五叔，这戏可是晚辈亲自和田夫子编的。