jquery's method of obtaining objects is sufficient to handle various common types of objects_jquery

(1) Basic object acquisition

$("*")
Get all objects

$("#element")
Get the id as element The object is equivalent to document.getElementById("element");

$(".abc")
Get the object with class abc

$("div")
Get all div elements in html

$("#a,.b,p")
Get id a and class b and all p elements

$("# a .b p")
Get the p element under the element with id a and class b

(2) Get the hierarchical object

$("div> input")
Get all input objects under div

$("div h")
Get an h element immediately after the div

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

(3) Simple object acquisition

$("element:first")
Get The first element of an element on the page, such as $("div:frist"), represents the first div

$("element:last")
Gets the last element of an element on the page, such as $("div:frist") represents the last div

$("element:not(selector)")
Remove all elements matching the selector such as $("input:not(:check )") represents all unchecked checkboxes

$("element:even")
Gets the even rows of element elements

$("element:odd")
Get the odd row of elements

$("element:eq(index)")
Get the element with a specific index such as $("div:el(2)") for the third div

$("element:gt(index)")
Matches all elements greater than the given index value

$("element:lt(index)")
Matches all Elements less than the given index

$(":header")
Matches h-tagged elements

$("element:animated")
Matches all elements that do not perform animation effects Elements of

(4) Acquisition of content objects and visibility of objects

$("Element:contains(text)")
Text in elements Whether it contains a certain letter or string

$("Element:empty")
Get an element object that does not contain text or sub-elements

$("Element:parent")
Get the object element containing text or sub-elements

$("Element:has(selector)")
Match whether a certain element contains a certain element such as $("p:has(span) ") means all p elements containing span elements

$("Element:hidden")
matches all invisible elements, including display:none and elements whose input attribute is hidden

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

(5) Advanced object acquisition

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

$("Element[attribute=abcd]")
Get all elements with an attribute of abcd

$("Element [attribute!=abcd]")
Get all elements whose attribute is not abcd

$("Element[attribute^=ab]")
Get all elements whose attribute starts with ab The elements of

$("Element[attribute$=ab]")
Get all the elements with an attribute ending in ab

$("Element[attribute*=ab]" )
Get all elements with an attribute containing ab

$("Element[selector1][selector2][...]")
Conform to attribute selectors such as $(" input[id][name][value=abcd]") means to obtain the input element with ID, Name and value abcd

(6) Obtaining sub-elements

$("Element:nth-child(index)")
Select the Nth child element under the parent, the index starts from 1
:nth-child(even) even
:nth- child(odd) odd number
: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")
The only child element under the parent

(7) Obtaining the form object

$(:input)
Can only match the input element type input button select textarea

$(:text)
All current line text boxes

$(:password)
All password boxes

$(:radio)
All radio buttons

$(:checkbox)
All checkboxes

$( :submit)
All submission buttons

$(:image)
All image 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

$(:disabled)
All disableable input elements

$(:checked)
All checkbox elements

$(:selected)
All drop-down tables

(8) Setting and removing element attributes

$("Element").attr(name)
Get the attribute value of the first matching element such as $("img").attr("src");

$("Element") .attr({key:value,key:value,...})
Set multiple attributes for an element at once

$("Element").attr(key, value)
Set an attribute for an element

$("Element").attr(key,function)
Set a calculated attribute for all matching elements

$ ("Element").removeAttr(name)
Remove an attribute