As el-Dialog fills in the form, the list below the mask changes

1. Using JSON. Parse (JSON. Stringify (row))

** json.parse (json.stringify (row))** Is used for deep copy. The process is to serialize the JS object (JSON string) using json.stringify, and then deserialize (restore) the JS object using json.parse. The purpose of serialization is to store (the object itself stores only an address map, if the power is cut off, the object will not exist

2. Pass data to child components

3. Use Watch in the component to listen

Immediate: true. When the component is initialized, the listener fires the handler method immediately