What is the implementation of two-way data binding in vue based on?

Two-way data binding in Vue is implemented through the reactive system and publish-subscribe model: Reactive system: Use Object.defineProperty() and Proxy API to track property changes and trigger the update function to update the DOM. Publish-subscribe model: When the properties of a responsive object change, the associated observers (components, instructions, templates) are notified, and the observers update the status and UI according to the notification.

The implementation of two-way data binding in Vue

The two-way data binding in Vue is a powerful and convenient features that enable developers to easily connect user interface data with underlying state. It is based on the implementation of reactive systems and publish-subscribe model.

Reactive system

Vue uses Object.defineProperty() and the Proxy API to create reactive objects that can track property changes. When the properties of a reactive object are changed, it will automatically trigger the corresponding update function to update the DOM and other related components.

Publish-Subscribe Model

Vue adopts the publish-subscribe model to implement two-way data binding. When a reactive object's properties change, it broadcasts a notification to the associated list of observers. Observers can include components, directives, and templates that update their state and UI based on notifications they receive.

Specific implementation

When a Vue instance is created, it converts the data object into a reactive object. After the attribute changes, the reactive system will trigger the update function and call the vm.$set() method (for directly setting the attribute) or the vm.$emit() method (for trigger event).

Observers can subscribe to specific property changes through the vm.$watch() method. When these properties change, the observer executes the specified callback function. Callback functions are typically used to update component state or the DOM.

Advantages of two-way data binding

The main advantages of two-way data binding in Vue include:

• Simplified data update process
• Reduce redundant code
• Improve development efficiency
• Enhance user interaction experience

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