Basic knowledge of jQuery introduction_jquery
JavaScript library functions and comparison
In order to simplify the development of JavaScript, some JavsScript libraries were born. JavaScript libraries encapsulate many predefined objects and utility functions. It can help users create rich client pages with Web 2.0 features that have difficult interactions, and is compatible with major browsers
Currentlypopular JavaScript librariesare:
Introduction to jQuery
jQuery is another excellent JavaScript library after Prototype
jQuery philosophy: Write less, do more. The advantages are as follows:
Lightweight
Powerful selector
Excellent encapsulation of DOM operations
Reliable event handling mechanism
Perfect Ajax
Excellent browser compatibility
Chain operation mode
……
jQuery: HelloWorld
jQuery object
jQuery object is the object generated by wrapping the DOM object through jQuery ($())
jQuery objects are unique to jQuery. If an object is a jQuery object, then it can use the methods in jQuery: $(“#persontab”).html();
The jQuery object cannot use any method of the DOM object, and the DOM object cannot use any method of jQuery
Convention: If you obtain a jQuery object, add $ in front of the variable.
var $variable = jQuery object
var variable = DOM object
DOM object converted to jQuery object
For a DOM object, you only need to wrap the DOM object with $() (the jQuery object is the object generated by wrapping the DOM object through jQuery), and you can get a jQuery object.
After conversion, you can use the methods in jQuery
Convert jQuery object to DOM object
jQuery objects cannot use methods in DOM, but if jQuery does not encapsulate the desired methods and you have to use DOM objects, there are two methods as follows:
(1) The jQuery object is an array object, and the corresponding DOM object can be obtained through the [index] method.
(2) Use the get(index) method in jQuery to get the corresponding DOM object
jQuery Selector
Selectors are the foundation of jQuery. In jQuery, event processing, DOM traversal and Ajax operations all rely on selectors
Advantages of jQuery selectors:
Simple writing method
Complete event handling mechanism
Basic Selector
The basic selector is the most commonly used selector in jQuery, and it is also the simplest selector. It searches for DOM elements through element id, class and tag name (id can only be used once in a web page, and class is allowed to be used repeatedly) .
Change the background color of the element with id one to # bbffaa
Change the background color of all elements with class mini to #bbffaa
Change the background color of all elements named
Change the background color of all elements to #bbffaa
Change the background color of all elements and the element with id two to # bbffaa
Level Selector
If you want to get specific elements through the hierarchical relationship between DOM elements, such as descendant elements, child elements, adjacent elements, sibling elements, etc., you need to use hierarchical selectors.
Note: ("prev ~ div") selector can only select sibling elements after the "# prev" element; while the method siblings() in jQuery has nothing to do with the front and back positions, as long as it is a sibling node, it can select
Hierarchical selector example
Change the background color of all
Change the background color of the
inner subsectionChange the background color of the next
Change the background color of all sibling
Change the background color of all
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