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QString QString::arg(long a, int fieldWidth = 0, int base = 10, QChar fillChar = QLatin1Char(' ')) const
QString QString::arg(int a, int fieldWidth = 0, int base = 10, QChar fillChar = QLatin1Char(' ')) const
1、QString格式化arg前面自动补0
int seconds = m_calc.elapsed() / 1000;
int hour = int(seconds / 3600);
int min = int((seconds - hour * 3600) / 60);
int sec = seconds % 60;
//QString格式化arg前面自动补0
QString str = QString("%1:%2:%3").arg(hour, 2, 10, QLatin1Char('0')).arg(min, 2, 10, QLatin1Char('0')).arg(sec, 2, 10, QLatin1Char('0'));
QStringList list;
list |