(Nowadays, with the rapid development of the Internet, the demand of network users changes rapidly and unpredictably. The update cycle of most websites is based on days, hours and even minutes. In this case, the front end of the website has become the most frequently changed part. With the gradual focus of Internet enterprises on front-end development, the number of front-end developers is increasing, but the investment of technical personnel is always limited. Facing the rapid change of requirements, many problems have arisen, such as front-end coding standards, front-end performance optimization, front-end security vulnerability prevention, etc. In order to manage these problems, a front-end modular technology with advanced development thinking and good design patterns is gradually maturing, and is favored by more and more enterprises. 58fenlei58 classification network)