Child the parent:
1. The child provides the data, and the parent takes the initiative to get it when needed
The parent component can invoke and fire child component methods and events by ref, and can retrieve child component data
The parent component
Child components
The results of
The father the son
The child component uses props to receive data from the parent component
The parent component:
Child components:
A value passed from a parent to a child changes in the parent, and the child changes with it
The first is through watch
The second is through computed
The parent component
Child components:
Watch to monitor
The computed to monitor
Computed and watch achieve the same effect in this simple example, whether it is using someone to listen or looking at the scene
The child component changes the value passed in props
You can’t change the values that are passed in props directly in a subcomponent, so we can do that using the event mechanism, or we can do that using.sync
(1) Event mechanism
The parent component
Child components
(2). The sync
The parent component
Child components
Pass values through bus