What does vm mean in vue

The vm in Vue represents the Vue instance object, which manages the virtual DOM (Virtual DOM), a lightweight representation used to track the actual DOM. Vue instances use vm variables to operate, including accessing data (vm.$data), updating data (vm.$set() and vm.$delete()), accessing methods (vm.$methods) and binding events (vm .$on() and vm.$off()). Understanding what vm means is crucial to working effectively in a Vue application.

The meaning of vm in Vue

In Vue, vm is the opposite of Vue Abbreviation for instance object. It represents an instance of Vue's Virtual DOM, which is a lightweight representation of the actual DOM used by Vue to track and manage.

Vue Instance

Vue instance is the core object in a Vue application. It manages data, templates and logic. To create a new instance in Vue, you can do the following:

<code class="javascript">const vm = new Vue({
  // 选项对象
});</code>

vm The variable now references the Vue instance object. It has various methods and properties for accessing and manipulating Vue instances.

Virtual DOM

Virtual DOM is an in-memory lightweight representation used by Vue to track and manage the actual DOM. It stores the state of the DOM, including elements, attributes, and event listeners. Vue detects changes and efficiently updates the real DOM by comparing the virtual DOM with the real DOM.

Usage of vm

#vm Variables can be used to access and manipulate Vue instances. Here are some common uses:

• Get data: vm.$data A data object containing a Vue instance.
• Update data: vm.$set() and vm.$delete() methods can be used to update data objects.
• Access methods: vm.$methods The object contains the methods of the Vue instance.
• Binding events: vm.$on() and vm.$off() methods can be used to bind and unbind event.

Conclusion

In Vue, vm is the abbreviation for Vue instance object. It represents an instance of the virtual DOM and provides methods and properties for accessing and manipulating Vue instances. Understanding the meaning of vm is crucial to working effectively in a Vue application.

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