"JQuery Authoritative Guide" Chapter 1 Getting Started with jQuery Development. This chapter starts with the basic concepts of jQuery in a step-by-step manner, introduces the download of the jQuery library, and introduces simple application methods; the latter part focuses on jQuery controlling DOM objects. And the introduction of page CSS styles, through some simple examples, allows readers to have a general understanding of the functional application of jQuery in the page, laying the foundation for further learning the detailed objects and methods of the jQuery library in the next chapter. This section introduces you to the coding style of the jQuery program.
1.1.5 Code style of jQuery program
1. The use of the “$” dollar sign
In the jQuery program, the most used one is the “$” dollar sign. This symbol must be used whether it is the selection of page elements or the prefix of functional functions. It can be said that It is the hallmark of the jQuery program.
2. Linked writing of event operations
When writing events for a certain element on the page, the jQuery program can write all events of the element in a linked way. To better illustrate the use of this writing method, we illustrate it through an example.
Example 1-2 Chain writing of jQuery events
(1) Function description
In the page, there is a