Vue3 is used to render content outside the current component DOM structure. 1. It allows you to move elements such as modal boxes, prompt tools to other locations on the page to solve layout problems, z-index hierarchy and accessibility problems; 2. When using it, you need to wrap the target content and specify the target selector, such as; 3. Vue will physically move the corresponding DOM node to the specified position while maintaining responsiveness and event logic; 4. Common application scenarios include modal boxes, notification messages, tooltips and barrier-free content; 5. When using it, you need to ensure that the target element already exists, and pay attention to the style scope and dynamic logic processing. In short, maintaining the logical relationship of component tree through virtual references provides a concise solution for complex UIs.

TomanageCSSandstylinginlargeVueprojectseffectively,adoptscopedstylesbydefault,establishaglobalCSSarchitecture,useconsistentnamingconventions,selectivelyleverageCSS-in-JSorutilitylibraries,enforceconsistencywithlinters,anddocumentdesigntokens.Beginwit

ToimplementdarkmodeinCSSeffectively,useCSSvariablesforthemecolors,detectsystempreferenceswithprefers-color-scheme,addamanualtogglebutton,andhandleimagesandbackgroundsthoughtfully.1.DefineCSSvariablesforlightanddarkthemestomanagecolorsefficiently.2.Us

Vertical centering content can be implemented in CSS in a variety of ways, the most direct way is to use Flexbox. 1. Use Flexbox: By setting the container to display:flex and in conjunction with align-items:center, vertical centering of child elements can be easily achieved; 2. Combination of absolute positioning and transform: suitable for absolute positioning elements, by setting top and left to 50% and then using translate (-50%,-50%) to achieve centering; 3. CSSGrid: Through display:grid and place-items:center, horizontal and vertical centering can be achieved at the same time. If only vertical centering is required, use align

The topic differencebetweenem, Rem, PX, andViewportunits (VH, VW) LiesintheirreFerencepoint: PXISFixedandbasedonpixelvalues, emissrelative EtothefontsizeFheelementoritsparent, Remisrelelatotherootfontsize, AndVH/VwarebaseDontheviewporttimensions.1.PXoffersprecis

SuspenseinVue3simplifieshandlingasynccomponentsbymanagingloadingstatesandintegratingerrorhandling.1.Itwrapsasynccontentanddisplaysfallbackcontentlikespinnersuntilthecomponentloads.2.YoudefineasynccomponentsusingdefineAsyncComponentandwraptheminaSuspe

InVue,slotsareessentialforbuildingreusableandflexiblecomponents,andtherearethreemaintypes:default,named,andscoped.Defaultslotsallowaparenttopasscontentintoachildcomponentwithnospecificplacement,idealforsingle-sectioncomponentslikecards.Namedslotsenab

Vue provides errorCaptured hooks and global error handlers to deal with application errors. 1. The errorCaptured hook can capture JavaScript errors in the child component tree, including errors in the life cycle hook and rendering function, receive error objects, error components and error location information, and can prevent errors from bubble upward by returning false. 2. Global error handling is configured through app.config.errorHandler, which is used to capture unexpected errors in the entire application, receive error objects, component instances and error type information. It is suitable for rendering functions, life cycle hooks, watcher callbacks and other scenarios, but does not automatically capture errors in event processing or asynchronous operations. 3.