面试题与答案

Vue.js is a progressive JavaScript framework used for building user interfaces. It is designed to be incrementally adoptable and can be easily integrated into other libraries or existing projects.

The Vue instance is a Vue.js object created using the Vue constructor. It serves as the root of the Vue application and provides a connection point between the application data and the DOM.

The template in Vue.js is the HTML structure that defines the rendering of a component. It can include Vue-specific syntax for data binding and directives.

Directives in Vue.js are special tokens in the markup that tell the library to do something to a DOM element. For example, v-bind is a directive used for binding an attribute to an expression.

The Vue.js lifecycle consists of various stages such as creation, mounting, updating, and destruction. Hooks like created, mounted, updated, and destroyed are used to perform actions at specific stages of the lifecycle.

The v-for directive is used for rendering a list of items by iterating over an array or an object in Vue.js.

Data binding in Vue.js is a two-way communication between the model (data) and the view (DOM). Changes in the model automatically update the view, and vice versa.

The v-if and v-else directives in Vue.js are used for conditional rendering. v-if shows an element if a given expression evaluates to true, while v-else shows an element if the expression is false.

Watchers in Vue.js are used to watch for changes in a specific property and perform custom actions when that property changes.

The v-bind directive in Vue.js is used for binding an attribute to an expression. It allows dynamic updates to HTML attributes based on the underlying data.