Introduction to jquery and syntax

I. Understanding of jquery

1. JQuery:

The jquery library can be added to a Web page with a simple line of markup.

2. What is jquery:

jquery is a library of JavaScript functions.

3, the jquery library contains the functions:

HTML element selection

HTML element manipulation

CSS Actions

HTML event functions

JavaScript effects and animations

HTML DOM Traversal and modification

Ajax

Utilities

Ii. Introduction of jquery

1. Add jquery to your page

1): Download the jquery library from jquery.com

2): Load jquery from CDN, such as load jquery from Google

A): Baidu and Sina servers have jquery

Example: Http://libs.baidu.com/jQuery/1.10.2/jquery.min.js

b): Google and Microsoft servers have jquery

Example: Http://ajax.googleapis.com/ajax/libs/jquery/jquery.min.js

2, Version Introduction:

v1.11.1:1.x Support ie6+

v2.1.1:2.x Support ie9+

Three, the basic grammar of Jqeury

1. jquery Syntax:

Base syntax: $ (selector). Action ()

Dollar sign definition jquery

Selector (selector) "Query" and "find" HTML elements

jquery action () performs an operation on an element

For example:

$ (this). Hide ()-hides the current element

$ ("P"). Hide ()-Hides all paragraphs

<! DOCTYPE html>

Introduction to jquery and syntax