用法：
#include "windows.h"
DWORD lastTime =0;
DWORD currentTime = 0;
DWORD spendTime = 0;
lastTime = GetTickCount();//ms
//延时
currentTime = GetTickCount();
spendTime = currentTime - lastTime;//ms
windows下的计算时间间隔 -- GetTickCount()
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转载自www.cnblogs.com/butterflybay/p/11362783.html
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