QTimer

一旦事件循环处理了所有其他未决事件，QTimer 也可用于请求函数运行。为此，请使用 0 ms 的间隔。

// option 1: Set the interval to 0 explicitly.
QTimer *timer = new QTimer;
timer->setInterval( 0 );
timer->start();

// option 2: Passing 0 with the start call will set the interval as well.
QTimer *timer = new QTimer;
timer->start( 0 );

// option 3: use QTimer::singleShot with interval 0
QTimer::singleShot(0, [](){
    // do something
});