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Similar to the development of children from appearance and color to older children, they can be classified according to concepts. For example, if they know the concept of "food", no matter what kind of vegetables they look like, they should be classified into one category. The classification of biology has also developed in this way. The earliest method is to identify and distinguish species according to phenotypic characteristics, and to classify them step by step according to the degree of phenotypic similarity, so as to establish a classification system that is easy to retrieve. This is the principle of phenotypic classification. However, the problem of phenotypic classification is that it is difficult to reveal the essential laws of things. Many creatures with very different shapes may have kinship relationships. For example, the online sentence "When I knew sunflowers belonged to Compositae, I collapsed" is what it means.　　中国维和警察简桀，在一次行动中将某地祁灵会首领巴茨抓捕，并接到特殊任务押送至法庭受审。一路经历无数次正面交锋，简桀始终保持中国警察的睿智和魄力，却不料一步步深陷巴茨设下的圈套。简桀能否突出重围，将巴茨绳之以法？《居家男人》是一部前卫的动作剧，讲述的是一个在国家调查局特别小组工作的中产阶级男人的故事。当他试图保护国家免受恐怖分子的袭击时，他还必须保护他的家人免受他那秘密的、高压力的、低报酬的工作的影响。　　不仅仅有相互之间的调侃、戏谑、捉弄，也更多了份相互鼓励、帮助、扶持。有美好，有欢笑；有失落，有惆怅；有努力，有奋斗，爱情公寓一如既往的见证了大家的青春与成长，无论是一菲、小贤、关谷、悠悠、子乔、美嘉、益达还是展博，大家的故事...中国奇书《推背图》是唐初李淳风与袁天罡合撰，预言历代变革之事，准确灵验。唐太宗翻看此书后，大为赞赏，重赏李淳风，袁天罡因妒忌李淳风夺其功，怀恨在心。太宗死后，两人更将《推背图》图、文分家，两家成为世仇。而《推背图》从此绝迹民间。数百年后，两家后人阴差阳错结成夫妇……So many concepts, don't have a headache! Let's look at the relationship between the three methods with pseudo code!Eight: Understand the policy pattern in javascript