Record the values passed using provide and inject, the values passed by the grandson component, and how to monitor data changes in the top-level component.
1.Used by ordinary value transfer
Introduce provide in the value passing page
pass data
Introduced on the receiving page
Receive data
Use operational data
2. Pass it to the grandchild component and monitor data changes
The usage method is similar to the above, but if you need to monitor, you must use the object object, otherwise you will not be able to monitor data changes.
Monitor data on the page
