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Know the principle man: Very good, your experience value has improved a lot. However, we can't start fighting monsters yet. After all, no monster can be directly sprayed to death. You lack tools. Then at this stage, we need to strengthen our programming ability. First find a framework to come down, read the source code, what? You said you can't read the source code, it doesn't matter, there are a lot of experience reading the source code online. Of course, the basis of these experiences is without exception: read more and write more. On this basis, find trick again. After the source code of the framework is set down, change some codes to run, debug them, and then constantly find out the reason to see how each API is written, and try to write it yourself. Write more and practice more. After 30 years of hard coding, you will definitely get something.　　当选后的杨桂花工作开展的并不顺利，村里的男人们都不服气，而女人们则有的妒嫉杨桂花，这样刚上任的杨桂花面临窘境。第一个阻碍就来自于自己的丈夫孙有为，面对他的不支持，杨桂花屡次解释不成，俩人的关系剑拔弩张。幸好王红粉和李亚米等好姐妹全力支持杨桂花的工作，这让杨桂花感到稍许欣慰。项梁应该是趁着大雾突围了，在城北一带遭遇到秦军的阻击。微.博、启明上，一些高冷、自诩不凡的读者或者一些别有用心的人。陈步森幼年经历坎坷，父母离婚后走入社会，渐渐误入歧途被牵扯进一个杀人案中，他与同伙大马镫等人在抢劫杀害李寂后踏上逃亡之路……Take the Soviet losses in the Soviet-German War as an example: the Soviet losses totaled 29.593 million. Among them, 6.817 million were killed (76% were killed in action, 16% were killed by injuries, 8% were killed by diseases and accidents), 4.456 million were captured or missing, and 18.32 million were injured (82.9% were injured, 16.6% were reduced due to illness, and 0.5% were frostbitten).What we understand is that if a single schema is instantiated, it will only be instantiated once. To implement a single schema, we simply use a variable to identify whether the class is instantiated. If it is not instantiated, then we can instantiate it once. Otherwise, we will directly return the instantiated object.