thinkphp5.0.24+PHPExcel export function always fails to export, please help analyze the reason

Question

#I checked a lot of information and changed several ways of writing, but it just can’t be exported. The report is 200 ok, but it is garbled. PHPExcel is the 1.8 version downloaded from the php Chinese website

Answer 1

Finally solved, after repeated testing, the export function does not support batch (selective) export, and can only be exported all at once