What is vm in vue

The vm in Vue represents virtual DOM (Virtual DOM), which is an internal representation that tracks and manages application data, with responsiveness, variability, dirty checking, and efficiency. It consists of data, calculated properties, methods, listeners and overhead. It is created through new Vue(). It accesses and modifies data through data, methods and other attributes. It provides reactive data binding, dirty check optimization, and data change tracking. and the advantage of ease of testing.

What is vm in Vue?

The vm in Vue represents virtual DOM (Virtual DOM), which is the internal representation used by Vue to track and manage application data. It is a lightweight JavaScript object that stores application state and user interface changes.

Features of vm:

• Responsiveness:When the data in the vm changes, the corresponding UI elements will automatically update .
• Mutability:It is a mutable object, which means that its data can change over time.
• Dirty Check:Vue uses a dirty check algorithm to detect changes in the vm and only update the affected parts of the UI.
• Efficiency:VM is lightweight and will only store necessary application state.

Composition of vm:

vm consists of the following parts:

• Data:Application status and user interface.
• Computed properties:Data derived based on other data, only recalculated when dependencies change.
• Methods:Functions that handle user interaction and modify data.
• Listener:Function called when the state of the vm or the user interface changes.
• Overhead:Internal data structures used to manage vm.

Usage:

vm is usually created bynew Vue(). It serves as the root-level element of the application instance and is responsible for coordinating the application's state and UI. You can access and modify data in the vm throughdata,methods, and other properties.

Advantages:

Using vm can improve the performance and maintainability of your application as it provides the following advantages:

• Reactive Data Binding:Automatically updates the UI in response to data changes.
• Dirty check optimization:Only update the affected UI part.
• Data change tracking:Allows Vue to easily detect and respond to state changes.
• Easy to test:Since the vm is mutable and testable, the application logic can be easily tested.

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