Implementation principle of model in vue

The model in Vue.js is a two-way bound data attribute. Its implementation principle is based on data hijacking, observer mode and publish-subscribe mode: Vue monitors model data changes through data hijacking, and uses getter and The setter function senses changes. Use the observer pattern to organize data listeners, and notify subscribers of updated content when the model value changes. Use the publish-subscribe model to coordinate the update process. When the model value changes, a notification is published, and the subscriber updates the view after receiving the notification. This simplifies data binding, improves responsiveness, and enhances code maintainability.

The implementation principle of model in Vue

The model in Vue.js is a two-way bound data attribute , allowing synchronous updates between the data model and the user interface. Its implementation is mainly based on the following principles:

1. Data hijacking:

Vue uses data hijacking technology to monitor model data. When the value of the model changes, Vue will sense the change through the getter and setter functions, thus triggering the update process.

2. Observer pattern:

Vue uses the observer pattern to organize data listeners. When the value of a model changes, all observers (such as view components) subscribed to the model are notified and their contents are updated.

3. Publish-subscribe mode:

Vue uses the publish-subscribe mode to coordinate the update process of the model. When the model's value changes, it publishes a notification, and components subscribed to the model receive the notification and update their views.

Detailed process:

When Vue detects that the model value changes, it will trigger the following steps:

1. Vue will pass The getter and setter functions sense the change and call the setter function.
2. The setter function will trigger a global event bus and publish a notification.
3. All observers subscribed to the model will receive this notification.
4. The observer will update its view to reflect the new value of the model.

Advantages:

• Simplified data binding: model can be easily bound to views without manual processing of data renew.
• Improve responsiveness: When the value of the model changes, the view automatically updates, providing a seamless and responsive user experience.
• Enhanced code maintainability: By separating data operations from view logic, the Vue model simplifies code maintenance and improves readability and reusability.

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