QByteArray array;
array.resize(5);
array[0]=0;
array[1]=1;
array[2]=2;
array[3]=3;
array[4]=4;
int currentindex=0;
qDebug(“array[index++]=%x”,array.at(++currentindex));
输出1
QByteArray array;
array.resize(5);
array[0]=0;
array[1]=1;
array[2]=2;
array[3]=3;
array[4]=4;
int currentindex=0;
qDebug(“array[index++]=%x”,array.at(currentindex++));
输出0,说明在at中先取currentindex的值再让其加1