How to deal with the lack of DLL when the program compiled by QT is running

After compiling the QT program, if the DLL is missing in other places, you can do this: On the
computer with QT5 installed, enter the command line of QT5, enter the directory where the EXE or DLL is located, and
run windeployqt filename (this filename refers to your own exe or dll), press Enter, and
all the QT libraries needed to run your exe or dll will be added in the current directory.