How is two-way binding in vue implemented?

Vue’s two-way data binding is implemented through the following steps: the data proxy is wrapped in a reactive proxy and listens for data changes. Data Hijack monitors object properties, detects value changes and triggers updates. Template compilation compiles the data binding syntax into an update function, triggering data changes to update the DOM. Event listening updates model data in response to user interaction and form input. Virtual DOM tracks DOM state, re-renders and applies changes to improve update efficiency. Bidirectional flow combines responsive proxies and virtual DOM to enable mutual updates of data and views.

The implementation principle of two-way data binding in Vue

Vue’s two-way data binding is a convenient and An efficient mechanism that allows data to be kept in sync between views and models. Its implementation mainly involves the following steps:

1. Data proxy

Vue will wrap the data object in a responsive proxy, which will listen for data changes . When data changes, the agent reacts immediately, triggering updates.

2. Data hijacking

Vue uses data hijacking technology to monitor properties in objects. When a property's value changes, Vue detects it and triggers the corresponding update.

3. Template compilation

When Vue parses the template, it compiles the data binding syntax (for example, {{data}}) into an update function. These functions will be triggered when the data changes and update the corresponding DOM elements.

4. Event monitoring

Vue will automatically monitor events such as form input and user interaction. When these events fire, Vue updates the corresponding model data.

5. Virtual DOM

Vue uses virtual DOM to track the state of the DOM. When data changes, Vue re-renders the virtual DOM and then applies the difference to the actual DOM. This greatly improves update efficiency and reduces overhead.

6. Bidirectional flow

The bidirectionality of data binding is achieved by the combination of responsive proxy and virtual DOM. When changes occur in the view, Vue updates the model data; when model data changes, Vue updates the view.

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