Code implementation and Web knowledge

1. In the development code, it is not recommended to write very complex query statements, which can be split into small statements. If it's a bi-related requirement, you don't care about performance.

2. Open a Web page only once, if two pictures are referenced in the Web page, the two images will be sent to the address of the request again two times.

3. Web page can embed style sheet, JS file, picture, icon, can also embed Web page

4.ajax, Web page asynchronous loading technology

5. A webpage consists of three parts, Html,css and JS. HTML is the content of the document, CSS for the length of the Web page, JS is the interaction of web pages.

Code implementation and Web knowledge