把ex2.exe放在H盘Ex2文件夹下，执行
H:\Ex2>windeployqt ex2.exe

H:\Ex2>windeployqt ex2.exe
H:\Ex2\ex2.exe 64 bit, release executable
Adding Qt5Svg for qsvgicon.dll
Skipping plugin qtvirtualkeyboardplugin.dll due to disabled dependencies (Qt5Qml Qt5Quick).
Skipping plugin qtvirtualkeyboard_hangul.dll due to disabled dependencies (Qt5Qml Qt5Quick).
Skipping plugin qtvirtualkeyboard_openwnn.dll due to disabled dependencies (Qt5Qml Qt5Quick).
Skipping plugin qtvirtualkeyboard_pinyin.dll due to disabled dependencies (Qt5Qml Qt5Quick).
Skipping plugin qtvirtualkeyboard_tcime.dll due to disabled dependencies (Qt5Qml Qt5Quick).
Skipping plugin qtvirtualkeyboard_thai.dll due to disabled dependencies (Qt5Qml Qt5Quick).
Direct dependencies: Qt5Core Qt5SerialPort Qt5Widgets
All dependencies   : Qt5Core Qt5Gui Qt5SerialPort Qt5Widgets
To be deployed     : Qt5Core Qt5Gui Qt5SerialPort Qt5Svg Qt5Widgets
Warning: Cannot find Visual Studio installation directory, VCINSTALLDIR is not set.
Updating Qt5Core.dll.
Updating Qt5Gui.dll.
Updating Qt5SerialPort.dll.
Updating Qt5Svg.dll.
Updating Qt5Widgets.dll.
Updating libGLESv2.dll.
Updating libEGL.dll.
Updating D3Dcompiler_47.dll.
Updating opengl32sw.dll.
Creating directory H:/Ex2/iconengines.
Updating qsvgicon.dll.
Creating directory H:/Ex2/imageformats.
Updating qgif.dll.
Updating qicns.dll.
Updating qico.dll.
Updating qjpeg.dll.
Updating qsvg.dll.
Updating qtga.dll.
Updating qtiff.dll.
Updating qwbmp.dll.
Updating qwebp.dll.
Creating directory H:/Ex2/platforms.
Updating qwindows.dll.
Creating directory H:/Ex2/styles.
Updating qwindowsvistastyle.dll.
Creating H:\Ex2\translations...
Creating qt_ar.qm...
Creating qt_bg.qm...
Creating qt_ca.qm...
Creating qt_cs.qm...
Creating qt_da.qm...
Creating qt_de.qm...
Creating qt_en.qm...
Creating qt_es.qm...
Creating qt_fi.qm...
Creating qt_fr.qm...
Creating qt_gd.qm...
Creating qt_he.qm...
Creating qt_hu.qm...
Creating qt_it.qm...
Creating qt_ja.qm...
Creating qt_ko.qm...
Creating qt_lv.qm...
Creating qt_pl.qm...
Creating qt_ru.qm...
Creating qt_sk.qm...
Creating qt_uk.qm...
Creating qt_zh_TW.qm...H:\Ex2>