The jQuery factory function $() is used to find elements on the page to work with. This function takes a string composed of CSS-like syntax, called a selector expression.
目录
Simple CSS
Simple CSS
Selector
Matches
*
All elements.
#id
The element with the given ID.
element
All elements of the given type.
.class
All elements with the given class.
a, b
Elements that are matched by a or b.
a b
Elements b that are descendants of a.
a > b
Elements b that are children of a.
a + b
Elements b that immediately follow a.
a ~ b
Elements b that are siblings of a and follow a.
Position among siblings
Position among siblings
Selector
Matches
:nth-child(index)
Elements that are the index child of their parent element (1-based).
:nth-child(even)
Elements that are an even child of their parent element (1-based).
:nth-child(odd)
Elements which are an odd child of their parent element (1-based).
:nth-child(formula)
Elements that are the nth child of their parent element (1-based). Formulas are of the form an+b for integers a and b.
:nth-last-chind()
The same as :nth-child(), but counting from the las element to the first.
:first-child
Elements that are the first child of their parent.
:last-child
Elements that are the last child of their parent.
:only-child
Elements that are the only child of their parent.
:nth-of-type()
The same as :nth-child(), but only counting elements of the same element name.
:nth-last-of-type
The same as :nth-last-child(), but only counting elements of the same element name.
:first-of-type
Elements which are the first child of the same element name among their siblings.
:last-of-type
Elements which are the last child of the same element name among their siblings.
:only-of-type
Elements that are the only child of the same element name among their siblings.
Position among matched elements
Position among matched elements
Selector
Matches
:first
The first element in the result set.
:last
The last element in the result set.
:not(a)
All elements in the result set that are not matched by a.
:even
Even elements in the result set (0-based).
:odd
Odd elements in the result set (0-based).
:eq(index)
A numbered element in the result set (0-based).
:gt(index)
All elements in the result set after (greater than) the given index (0-based).
:lt(index)
All elements in the result set before (less than) the given index (0-based).
Attributes
Attributes
Selector
Matches
[attr]
Elements that have the attribute attr.
[attr=”value”]
Elements whose attr attribute is value.
[attr!=”value”]
Elements whose attr attribute is not value.
[attr^=”value”]
Elements whose attr attribute begins with value.
[attr$=”value”]
Elements whose attr attributes ends with value.
[attr*=”value”]
Elements whose attr attribute contains the substring value.
[attr~=”value”]
Elements whose attr attribute is a space-delimited set of strings, one of which is value.
[attr|=”value”]
Elements whose attr attributes is either equal to value or begins with value followed by a hyphen.
Forms
Forms
Selector
Matches
:input
All <input>, <select>, <textarea>, and <button> elements.
:text
The <input> elements with type=”text”.
:password
The <input> elements with type=”password”.
:file
The <input> elements with type=”file”.
:radio
The <input> elements with type=”radio”.
:checkbox
The <input> elements with type=”checkbox”.
:submit
The <input> elements with type=”submit”.
:image
The <input> elements with type=”image”.
:reset
The <input> elements with type=”reset”.
:button
The <input> elements with type=”button” and <button> elements.
:enabled
Enabled form elements.
:disabled
Disabled form elements.
:checked
Checked checkboxes and radio buttons.
:selected
Selected <option> elements.
Miscellaneous selectors
Miscellaneous selectors
Selector
Matches
:root
The root element of the document.
:header
Header elements (for example, <ht>, <h2>).
:animated
Elements with an animation in progress.
:contains(text)
Elements containing the given text.
:empty
Elements with no child nodes.
:has(a)
Elements containing a descendant element matching a.
:parent
Elements that have child nodes.
:hidden
Elements that are hidden, either through CSS or because they are .
:visible
The inverse of :hidden.
:focus
The elements that has the keyboard focus.
:lang(language)
Elements with the given language code (either due to a lang attribute on the element or an ancestor, or a <meta> declaration).
:target
Whichever element is targeted by the URI’s fragment identifier, if any.
