会用到一个时间类：qtime
定时类：qtimer

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# Project created by QtCreator 2023-08-13T10:49:31
#
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QT       += core gui

greaterThan(QT_MAJOR_VERSION, 4): QT += widgets

TARGET = timer
TEMPLATE = app

# The following define makes your compiler emit warnings if you use
# any feature of Qt which as been marked as deprecated (the exact warnings
# depend on your compiler). Please consult the documentation of the
# deprecated API in order to know how to port your code away from it.
DEFINES += QT_DEPRECATED_WARNINGS

# You can also make your code fail to compile if you use deprecated APIs.
# In order to do so, uncomment the following line.
# You can also select to disable deprecated APIs only up to a certai