jQuery is a very popular JavaScript library that simplifies JavaScript programming and has become one of the essential tools in front-end development. In jQuery, chain operations are often used to operate on DOM elements. The end() method in chain operations is a commonly used method, which is used to roll back to the previous state.
end()The method is used to reset the currently selected collection to its previous state. That is, if multiple operations are performed on a selection set, the end() method can be used to return to the previous selection set.
In jQuery, the end() method can be used anywhere in the chain operation. When you need to go back to the previous state in a chain operation, you only need to call the end() method.
For example, we have an HTML structure as follows:
<div class="parent"> <div class="child">child 1</div> <div class="child">child 2</div> </div>
We can use the following code to set all child elements to red and return it to the parent element:
$(".parent").children().css("color", "red").end();When When we call the end() method, it will fall back to the state where the selector selects the .parent element, that is, the selection collection is reset and no longer affects .child element.
In addition to using the end() method in chain operations, it can also be used in other scenarios. For example, when getting and setting properties, the end() method can be used to fall back to the original selection set. Here's an example of getting an element's attributes and returning them to their previous state:
$(".test")
.attr("name", "test")
.end()
.attr("id", "test");In this example, we set an element named test on the .test element attributes. Then use the end() method to return to the original selection set, which is the set state that acts on the .test element. Then we use the attr() method to set the id attribute, but this attribute will not be applied to the .test element, but to the element before selecting the collection. element because we have used the end() method to fall back to the original selection set.
Finally, it should be noted that the end() method can only be used for the collection returned by the previous step in the chain operation. If other operations are used in the chain operation, the end() method will have no effect.
In short, the end() method is a very practical method, which can easily return to the previous state in chain operations. Being proficient in this method can improve the efficiency of your code and make it easier to maintain.
The above is the detailed content of end method in jquery. For more information, please follow other related articles on the PHP Chinese website!
Hot AI Tools
Undress AI Tool
Undress images for free
Undresser.AI Undress
AI-powered app for creating realistic nude photos
AI Clothes Remover
Online AI tool for removing clothes from photos.
Clothoff.io
AI clothes remover
Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!
Hot Article
Hot Tools
Notepad++7.3.1
Easy-to-use and free code editor
SublimeText3 Chinese version
Chinese version, very easy to use
Zend Studio 13.0.1
Powerful PHP integrated development environment
Dreamweaver CS6
Visual web development tools
SublimeText3 Mac version
God-level code editing software (SublimeText3)
Hot Topics
How can CSS be used to implement dark mode theming on a website?
Jun 19, 2025 am 12:51 AM
ToimplementdarkmodeinCSSeffectively,useCSSvariablesforthemecolors,detectsystempreferenceswithprefers-color-scheme,addamanualtogglebutton,andhandleimagesandbackgroundsthoughtfully.1.DefineCSSvariablesforlightanddarkthemestomanagecolorsefficiently.2.Us
Can you explain the difference between em, rem, px, and viewport units (vh, vw)?
Jun 19, 2025 am 12:51 AM
The topic differencebetweenem, Rem, PX, andViewportunits (VH, VW) LiesintheirreFerencepoint: PXISFixedandbasedonpixelvalues, emissrelative EtothefontsizeFheelementoritsparent, Remisrelelatotherootfontsize, AndVH/VwarebaseDontheviewporttimensions.1.PXoffersprecis
What are the key differences between inline, block, inline-block, and flex display values?
Jun 20, 2025 am 01:01 AM
Choosing the correct display value in CSS is crucial because it controls the behavior of elements in the layout. 1.inline: Make elements flow like text, without occupying a single line, and cannot directly set width and height, suitable for elements in text, such as; 2.block: Make elements exclusively occupy one line and occupy all width, can set width and height and inner and outer margins, suitable for structured elements, such as; 3.inline-block: has both block characteristics and inline layout, can set size but still display in the same line, suitable for horizontal layouts that require consistent spacing; 4.flex: Modern layout mode, suitable for containers, easy to achieve alignment and distribution through justify-content, align-items and other attributes, yes
What are CSS Houdini APIs, and how do they allow developers to extend CSS itself?
Jun 19, 2025 am 12:52 AM
CSSHoudini is a set of APIs that allow developers to directly manipulate and extend the browser's style processing flow through JavaScript. 1. PaintWorklet controls element drawing; 2. LayoutWorklet custom layout logic; 3. AnimationWorklet implements high-performance animation; 4. Parser&TypedOM efficiently operates CSS properties; 5. Properties&ValuesAPI registers custom properties; 6. FontMetricsAPI obtains font information. It allows developers to expand CSS in unprecedented ways, achieve effects such as wave backgrounds, and have good performance and flexibility
What is the significance of Vue's reactivity transform (experimental, then removed) and its goals?
Jun 20, 2025 am 01:01 AM
ReactivitytransforminVue3aimedtosimplifyhandlingreactivedatabyautomaticallytrackingandmanagingreactivitywithoutrequiringmanualref()or.valueusage.Itsoughttoreduceboilerplateandimprovecodereadabilitybytreatingvariableslikeletandconstasautomaticallyreac
How can CSS gradients (linear-gradient, radial-gradient) be used to create rich backgrounds?
Jun 21, 2025 am 01:05 AM
CSSgradientsenhancebackgroundswithdepthandvisualappeal.1.Startwithlineargradientsforsmoothcolortransitionsalongaline,specifyingdirectionandcolorstops.2.Useradialgradientsforcirculareffects,adjustingshapeandcenterposition.3.Layermultiplegradientstocre
How can internationalization (i18n) and localization (l10n) be implemented in a Vue application?
Jun 20, 2025 am 01:00 AM
InternationalizationandlocalizationinVueappsareprimarilyhandledusingtheVueI18nplugin.1.Installvue-i18nvianpmoryarn.2.CreatelocaleJSONfiles(e.g.,en.json,es.json)fortranslationmessages.3.Setupthei18ninstanceinmain.jswithlocaleconfigurationandmessagefil
How does provide and inject allow for deep component communication without prop drilling in Vue?
Jun 20, 2025 am 01:03 AM
In Vue, provide and inject are features for directly passing data across hierarchical components. The parent component provides data or methods through provide, and descendant components directly inject and use these data or methods through inject, without passing props layer by layer; 2. It is suitable for avoiding "propdrilling", such as passing global or shared data such as topics, user status, API services, etc.; 3. Note when using: non-responsive original values ??must be wrapped into responsive objects to achieve responsive updates, and should not be abused to avoid affecting maintainability.
