jquery acquires objects in a way that is sufficient to handle common types of objects _jquery

(1) Basic object acquisition

$("*")
Get all Objects

$ ("#element")
Obtaining an object with an ID of element is equivalent to document.getElementById ("element");

$ (". ABC")
To get an object with class ABC

$ ("div")
Get all the DIV elements in HTML

$ ("#a,. B,p")
Get ID A and Class B and all P elements

$ ("#a. B P")
Get the P element with ID A and Class B element

(2) Hierarchical object acquisition

$ ("Div>input")
Get all input objects under DIV

$ ("Div+h")
Gets the H element immediately following the DIV

$ ("div~p")
Gets all the P elements after the element div

(3) Simple Object acquisition

$ ("Element:first")
Gets the first instance of an element on the page ("Div:frist") to represent the first Div

$ ("Element:last")
Gets the last one of the elements on the page, such as $ ("Div:frist"), which represents the last Div

$ ("Element:not (selector)")
Remove all elements that match the selector such as $ ("Input:not (: Check)") to indicate all unchecked check boxes

$ ("Element:even")
Get even rows of element elements

$ ("element:odd")
Get odd rows of an element

$ ("Element:eq (Index)")
Getting the element of a particular index, such as $ ("Div:el (2)"), represents a third div

$ ("ELEMENT:GT (Index)")
Matches all elements that are greater than the given index value

$ ("Element:lt (Index)")
Matches all elements less than the given index

$ (": Header")
Elements that match H-tags

$ ("element:animated")
Matches all elements that do not have an animation effect

(4) Acquisition of content objects and visibility of objects

$ ("Element:contains (text)")
Whether the text in the element contains a letter or string

$ ("Element:empty")
To get an element object that does not contain text or child elements

$ ("element:parent")
Get object element contains text or child elements

$ ("Element:has (selector)")
Matches whether an element containing an element such as $ ("P:has (span)") represents all the P elements that contain span elements

$ ("Element:hidden")
Matches all invisible elements, including Display:none and the properties of input are hidden elements

$ ("element:visible")
Match all courseware elements

(5) object get Advanced

$ ("Element[id]")
Get all elements with an id attribute

$ ("ELEMENT[ATTRIBUTE=ABCD]")
Gets all elements of an ABCD attribute

$ ("ELEMENT[ATTRIBUTE!=ABCD]")
To get all elements that have a property that is not ABCD

$ ("Element[attribute^=ab]")
Get all the elements of a property that start with AB

$ ("Element[attribute$=ab]")
To get all the elements of a property ending in AB

$ ("Element[attribute*=ab]")
Get all the elements that contain a property containing AB

$ ("element[selector1][selector2][...]")
Conforming to a property selector such as $ ("INPUT[ID][NAME][VALUE=ABCD]") means that an INPUT element with ID, name, and value is ABCD is obtained

(6) Acquisition of child elements

$ ("Element:nth-child (Index)")
Select the nth child element under the parent and the index starts at 1
: Nth-child (even) even
: Nth-child (odd) odd
: Nth-child (3n) expression
: Nth-child (2) Index
: Nth-child (3n+1) expression

$ ("Element:first-child")
The first child element under the parent

$ ("Element:last-child")
The last child element under the parent

$ ("Element:only-child")
A unique child element under the parent

(7) Acquisition of form objects

$ (: Input)
can only match INPUT element type to input button select textarea

$ (: Text)
All When line text boxes

$ (:p assword)
All Password boxes

$ (: Radio)
All radio buttons

$ (: checkbox)
All check boxes

$ (: Submit)
All Submit Buttons

$ (: image)
All picture fields
$ (: RESET)
All recharge Buttons

$ (: button)
All buttons

$ (: File)
All file upload fields

$ (: Hidden)
All invisible elements or elements of type hidden

$ (: Enabled)
All available input elements

$ (:d isabled)
All unavailable input elements

$ (: Checked)
All check box elements

$ (: Selected)
All drop down tables

(8) the setting and removal of element attributes

$ ("Element"). attr (name)
Gets the property value of the first matching element, such as $ ("img"). attr ("src");

$ ("Element"). attr ({key:value,key:value,......})
Set multiple properties for one element at a one-time

$ ("Element"). attr (Key,value)
Set properties for an element

$ ("Element"). attr (Key,function)
Set a computed property for all matching elements

$ ("Element"). Removeattr (name)
Remove a property