# RunningSpeedTest Class
1. 性質：實例類
2. 開發目的：高精度計時
## 域 Field
freq
CounterBefore
## 方法 Method
Start()
End() - 返回 `Start()到End()` 的時間差，單位是毫秒
## 示例
```autohotkey
Obj := new RunningSpeedTest()
Obj.Start()
Sleep 1000
LogPrintln(Obj.End(),A_LineFile "(" A_LineNumber ")" " : " "Obj.End() >>> `r`n")
return
```
From：https://wyagd001.github.io/zh-cn/docs/commands/DllCall.htm#QPC
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