double Millesecond()
{
LARGE_INTEGER frequency;
LARGE_INTEGER timeStart;
QueryPerformanceFrequency(&frequency); // 返回每秒，cpu 所使用的时钟数
QueryPerformanceCounter(&timeStart);
double dfrequency = (double)frequency.QuadPart;
double dtimeStart = (double)timeStart.QuadPart;
return dtimeStart * 1000.0f / dfrequency;
}