What are the grammatical structures of jQuery?

The syntax structure of jQuery mainly includes three parts: [$()], document and [ready()], and selector. Among them, document and [ready()] are called factory functions respectively, and the syntax is: [$(selector).action();].

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1. The syntax structure of jQuery

jQuery The statement mainly contains three parts: $(), document and ready() are called factory functions, selectors, respectively.

Syntax: $(selector).action();

2. Nodes in DOM are usually divided into three types: element nodes, text nodes, and attribute nodes

3. To add styles to DOM elements, you can use addClass() Method and css()method

4. Use the next() method to obtain the immediately adjacent sibling elements of each element in the matched element set

5. Conversion between DOM objects and JQuery objects

var txtName=document.getElementById("txtName");  //DOM对象
var  $txtName=$(txtName);   //jQuery对象

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