The principle of two-way data binding in vue

Vue data two-way binding principle: intercept data changes: create a proxy object through Object.defineProperty(), and define getters and setters to intercept data changes. View update: When the data attribute is accessed or updated through the v-model directive, the setter or getter is triggered to synchronize the view and data. Watchers monitoring: Watchers in Vue monitor data changes and trigger corresponding operations when the data changes, such as updating views or calculated properties. Virtual DOM update: Vue only updates the actual changed DOM nodes through virtual DOM comparison to improve performance.

The principle of Vue two-way data binding

In Vue, two-way data binding is a core feature , which allows data to be automatically synchronized between components and views. Its essence is to use the Object.defineProperty() method to intercept data changes and trigger view updates.

How it works

When initializing a Vue component, Vue will use Object.defineProperty() to create a proxy object for the component's data object. This proxy object will define getters and setters for all data properties.

• Getter: When you use the v-model directive to access a data property, Vue triggers the getter function. This returns the current value of the data attribute.
• Setter: When a data property is updated via the v-model directive, Vue triggers the setter function. This updates the data property and triggers the component's watchers.

watchers

The watchers in the Vue component are functions that monitor data changes. When data attributes change, watchers are triggered and perform corresponding operations. For example, updating a view or triggering other computed properties.

Virtual DOM

Vue uses virtual DOM to achieve efficient view rendering. When data changes, Vue generates a new virtual DOM, compares it to the previous virtual DOM, and updates only the DOM nodes that actually changed. This can greatly improve performance.

Summary

Two-way data binding in Vue is achieved through the combination of Object.defineProperty(), proxy objects and watchers. It allows data to be automatically synchronized between components and views and leverages the efficient update mechanism of the virtual DOM, enabling responsive and high-performance applications.

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