What answers are needed for vue interview

With the rapid development of Vue, Vue interviews have become the only way for many developers. As a Vue developer, you must not only showcase your skills and experience during interviews, but also prepare for common interview questions. So, what kind of answers do you need to prepare for a Vue interview? This article will introduce it to you.

1. Basic knowledge of Vue

1. What is Vue?

Vue is a progressive JavaScript framework for building user interfaces. Its core library provides a component system for MVVM data binding and reuse.

2. What is MVVM?

MVVM is divided into three layers: Model (data model), View (view) and ViewModel (view model). Among them, the view model layer serves as a data transfer station and is the bridge between Model and View. The two-way binding of data is achieved through the view model layer. The two-way data binding in Vue is implemented based on this principle.

3. What is the Vue instantiation process?

Vue instantiation is the startup process of the Vue application. When new Vue is created, it will go through a series of processes, mainly including the following steps:

① Create a Vue instance and initialize it;

② Make the Vue instance responsive Process, set data, computed, watch and other attributes as observable objects;

③ Compile the template of the Vue instance and generate the render function;

④ Mount the generated render function to the corresponding on the DOM node.

2. Vue framework design principle

1. What is the design principle of Vue framework?

Vue’s design principles mainly include two parts: responsive system and virtual DOM.

Responsive system: Vue uses the Object.defineProperty() method to define data as an observable object. Implement responsive updates through two-way data binding. Automatically trigger view updates when data changes.

Virtual DOM: After the data is updated, Vue will generate a new virtual DOM, compare the new virtual DOM with the old virtual DOM, find out the differences between the two, and compare them Applied to the actual DOM.

2. What is the difference between computed and watch in Vue?

Computed and watch in Vue are both ways to monitor data, but they have the following differences:

computed: is calculated based on the existing attributes in the data computed properties. It will only be recalculated if the relevant properties change. Computed is generally used for results calculated from multiple related attributes.

watch: monitors a certain attribute in data. When the value of a certain attribute changes, the response operation set by the watch will be automatically performed. Watch is generally used to monitor changes in single data.

3. Vue component development

1. What are the advantages of components in Vue?

The components in Vue can modularize the code. Each component has a single responsibility and is easy to organize and maintain. At the same time, data communication and event delivery between components are also very convenient.

2. What are the life cycles of Vue components?

Vue components have eight life cycles, namely: created, mounted, updated, destroyed, beforeCreate, beforeMount, beforeUpdate and activated/deactivated.

Among them, created and beforeCreate are executed during the Vue instance creation process, mounted and destroyed are executed when the dom node is mounted and logged off, beforeMount is executed before the node is mounted, beforeUpdate is executed before the update, and updated is executed after the update. Execution, activated/deactivated is executed when the component is activated/deactivated.

4. Vue routing and state management

1. What is Vue routing?

Vue routing is a routing system for building single page applications (SPA). It implements page switching, forward, backward and other operations of SPA without refreshing the page through hash value, history and other methods.

2. What is state management?

State management refers to promoting shared data in Vue components to the global level to facilitate state sharing between different components. In Vue, state management is mainly managed through Vuex.

3. What is Vuex?

Vuex is Vue’s officially recommended state management library, which is similar to global data. It implements data transfer and monitoring between components through two interfaces $scope.$emit and $scope.$on. At the same time, Vuex also provides functions such as status snapshots and time travel to facilitate developers for debugging and management.

The above are common questions and answers in Vue interviews, but they are not all. When preparing for an interview, you need to selectively prepare relevant knowledge points and skills based on your actual situation. Finally, I wish everyone a smooth interview and find your favorite job as soon as possible!

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