Step-by-step learning jquery (a) jquery object

JQuery is another excellent JavaScript library following Prototype.
JQuery Concept: write less, do more. The advantages are as follows:
Lightweight
Powerful Selector
Excellent DOM operation encapsulation
Reliable event-handling mechanism
The Perfect Ajax
Excellent browser compatibility

Chain-operated mode

Jquery:hello World

1. JQuery Object
jquery objects are objects that are produced after wrapping a DOM object through jquery ($ ())
jquery objects are unique to jquery. If an object is a jquery object, then it can use the method in jquery: $ ("#persontab"). html ();
jquery objects cannot use any method of the DOM object, nor can the DOM object use any of the methods in jquery
Convention: If you get a JQuery object, precede the variable with $.
var $variable = JQuery Object
var variable = DOM Object
1.1jQuery objects Turn into DOM objects
jquery objects cannot use methods in the DOM, but if jquery does not encapsulate the desired method, it has to use the DOM object, as in the next two ways:
(1) The JQuery object is an array object that can be obtained by means of [index].
(2) Use the Get (index) method in JQuery to get the corresponding DOM object
<! DOCTYPE html>
1.2 DOM objects into JQuery objects
For a DOM object, you can get a jquery object by wrapping the DOM object with $ () (the jquery object is the object that was created after wrapping the DOM object with jquery). After conversion, you can use the methods in JQuery.



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