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This article introduces the relevant knowledge of "what does vm refer to in vue". In the operation of actual cases, many people will encounter such a dilemma. Then let the editor lead you to learn how to deal with these situations. I hope you can read it carefully and be able to achieve something!

In vue, vm is the abbreviation of ViewModel, the meaning of view model, and the bridge between view and model; ViewModel can monitor changes in data, and then notify the corresponding view to do automatic updates to achieve two-way binding.

This article operating environment: windows10 system, Vue2.9.6 version, DELL G3 computer.

What is vm in vue

VM is actually a ViewModel-- view model.

MVVM View-Model-View Model

[view] refers to the page you see, and [model] refers to the data passed by the back end.

[view model] the core of the mvvm schema, which is the bridge between view and model; it has two directions:

One is to convert [model] into [view], that is, the data passed by the back end is converted into the page you see. This is done by data binding.

The second is to convert [view] into [model], that is, the pages you see are converted into back-end data. This is done by listening for DOM events.

Both of these directions are implemented, which we call [two-way binding] of data.

Under the framework of MVVM, views and models cannot communicate directly. They communicate through ViewModel, and ViewModel usually implements an observer observer. When the data changes, ViewModel can monitor the change of the data, and then notify the corresponding view to do automatic updates.

When the user manipulates the view, ViewModel can also monitor the changes in the view and then notify the data to make changes, which actually realizes the two-way binding of the data. And View and ViewModel in MVVM can communicate with each other.

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