Under what circumstances will vue subcomponents be rendered?

Vue is one of the modern JavaScript frameworks that aims to simplify the web application development process. Vue components are one of the core concepts of Vue. The Vue framework allows developers to break down code into widgets or components for easier maintenance and reuse. Vue subcomponents are components inside the parent component and have the following characteristics.

1. Simple component communication method
   The components in the Vue application are independent of each other. In Vue, components can communicate easily, which is also a major advantage of Vue components. Simply put, communication between Vue components is achieved through props and emit.

Props are the mechanism for passing data from parent components to child components. Through props, we can pass values ​​of any data type to child components. emit is the mechanism for passing data from child components to parent components. The emit mechanism allows child components to emit data to parent components, thereby realizing data sharing.

2. Subcomponent rendering
   In Vue, in order for subcomponents to be rendered, they need to meet the following conditions:

• The template of the subcomponent must be defined in Within the template of the parent component. For example, use to wrap the template of a child component.
• Child components must be registered in the parent component. We can register child components in the
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