PHPExcel export does not generate Excel file

Question

After exporting, such code is generated. Below is the source code of my method. Could someone please point me to where I went wrong?

Answer 1

The returned data is all there. The data has been generated, but the way you read it is different. You just need to replace ajax with a link.

Answer 2

It is recommended to look at the 11 warnings in the upper right corner