a, int fieldWidth = 0, int base = 10, QChar fillChar = QLatin1Char( ' ' )) const
QString arg(uint a,...int fieldWidth = 0, int base = 10, QChar fillChar = QLatin1Char( ' ' )) const
QString arg(long a, int...= 0, int base = 10, QChar fillChar = QLatin1Char( ' ' )) const
QString arg(short a, int fieldWidth =...0, int base = 10, QChar fillChar = QLatin1Char( ' ' )) const
QString arg(QChar a, int fieldWidth = 0,...;
//16进制
strShowHex = QString("0x%1").arg(int(val), 4, 16, QLatin1Char('0'));
//显示结果为: 0x00fc
//2进制