In the age when Confucius lived, what font did people use to write?

During the Spring and Autumn Period and the Warring States Period, the development of Chinese characters was also affected by the turmoil, and the situation of nonstandard and diverse characters became more and more serious. From the perspective of diversification of calligraphy development, it is not without benefits. However, language and writing are, after all, tools for people to exchange ideas and engage in social communication, and "abnormal language" and "abnormal writing" are not convenient for people to exchange ideas and social communication. Therefore, Qin Shihuang unified China. At the beginning of the establishment of the Qin Dynasty, he adopted the suggestion of Prime Minister Li Si, and unified the national characters on the basis of following the Qin language of the Western Zhou Dynasty. Taking seal script as a literacy textbook for children's enlightenment is considered to be a model for popularization and application. Since then, Xiao Zhuan, as a character opposite to Da Zhuan, has become a popular character in Qin Dynasty. Compared with the previous generation, this writing method has the characteristics of round and uniform writing lines, unified structure and rectangular font. As far as the development of Chinese characters is concerned, this is undoubtedly a great progress. But this is not the only style of calligraphy in the Qin Dynasty. Xu Shen in the Eastern Han Dynasty said, "Shu Qin has eight styles: one is the big seal script, the other is the small seal script, the third is lettering, the fourth is worm script, the fifth is copying, the sixth is official script, the seventh is @ script, and the eighth is official script". Explain that there were also: Dazhuan and Lishu (called Guli or Li Qin) in parallel with Xiaozhuan at that time. "Insect book", also known as bird book and bird seal, is an artistic font of seal script with bird head as the pen and worm as the line. It is a continuation of the inscription by Gou Jian, the king of Zhao Yue. "Engraving" is Xiao Zhuan; "Imitation seal" is a kind of small seal script with square structure, which was initiated by Han and India. The "official script" used in doorplates and seals, and the "#" engraved on weapons, are just changes in the scope of application of Da Zhuan, Xiao Zhuan or Li Shu. Xu Shen's "Eight Styles of Qin Shu" is based on Chinese characters, and it is nothing more than the three-body of Da Zhuan, Xiao Zhuan and Li Shu.