The excel file exported by vue cannot be opened, or the file content is object object

Requirements: Select data to export to excel

Problem: The file export cannot be opened at first, but later it can be opened and the file content displays object.

After writing according to the normal export process, the backend interface returns

Print the result of res

Front-end code (before modification)

Error in exporting file as a result

After some troubleshooting, I found that I made a mistake in passing the value.

What we want is res.data, not res

Modified front-end code

The exported result will be correct.