اطلاعات اولیه jquery

Examples: 

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

$("p").hide() - hides all <p> elements.

$(".test").hide() - hides all elements with class="test".

$("#test").hide() - hides the element with id="test".  

$(document).ready(function(){

   // jQuery methods go here...

});  

$(function(){

   // jQuery methods go here...

});  

Selectors

Syntax	Description
$("*")	Selects all elements
$(this)	Selects the current HTML element
$("p.intro")	Selects all <p> elements with class="intro"
$("p:first")	Selects the first <p> element
$("ul li:first")	Selects the first <li> element of the first <ul>
$("ul li:first-child")	Selects the first <li> element of every <ul>
$("[href]")	Selects all elements with an href attribute
$("a[target='_blank']")	Selects all <a> elements with a target attribute value equal to "_blank"
$("a[target!='_blank']")	Selects all <a> elements with a target attribute value NOT equal to "_blank"
$(":button")	Selects all <button> elements and <input> elements of type="button"
$("tr:even")	Selects all even <tr> elements
$("tr:odd")	Selects all odd <tr> elements

 Events

Event Method	Description
$(document).ready(function)	Binds a function to the ready event of a document (when the document is finished loading)
$(selector).click(function)	Triggers, or binds a function to the click event of selected elements
$(selector).dblclick(function)	Triggers, or binds a function to the double click event of selected elements
$(selector).focus(function)	Triggers, or binds a function to the focus event of selected elements
$(selector).mouseover(function)	Triggers, or binds a function to the mouseover event of selected elements