What does data return in vue?

Vue is a popular JavaScript framework that is widely used to build single-page applications and dynamic web pages. One of Vue's core features is componentization, which allows developers to split applications into reusable, independent components. This makes development, maintenance and testing easier. In Vue, the main way components communicate is through props and emit, and the data required by these components is stored in the component's data attribute.

So, in Vue, what exactly does data return? Simply put, data is where state is stored in a Vue component. When we create a Vue component, its data property will contain all the reactive data within the component. This means that when data changes, Vue will automatically re-render the component to reflect those changes.

For example, we can create a Vue component to display a to-do list. The data attribute in this component will contain the to-do item's data, such as the title, description, and completion status of each to-do item. When the user marks a to-do item as completed, we can update the data attribute in the component to reflect this change in status. Vue will automatically re-render the component and display the updated data on the screen.

Although in Vue, the data attribute is called reactive data, it is not actually reactive data. Instead, Vue uses a technique called "dependency tracking" to achieve reactive behavior. When a piece of data in a component is accessed, Vue associates the data with the component's rendering function. This means that Vue understands what data is used and how to match it with the component's template. When the data changes, Vue will automatically update any elements that depend on the data.

Therefore, in Vue, data is not a simple JavaScript object, but one of the very important attributes in Vue. Its role is to store all the state in the component, and it uses some very useful techniques to achieve reactive behavior. When we build an application based on Vue, it is very important to understand and master the use of data.

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