我正在读取循环迭代器上的goroutine经常导致循环赋值中的最后一个值用于每次迭代。例如。 https://github.com/golang/go/wiki/CommonMistakes#using-goroutines-on-loop-iterator-variables
然而，这只会发生在闭包上，例如：匿名函数？
我似乎无法通过此示例https://play.golang.org/p/lpZ-yD1mHu
重现此问题当我使用这样的匿名函数时，它会重新创建问题https://play.golang.org/p/mDa0Z6mUP8
答案 0 :(得分：4)
然而，这只是封闭的问题，例如匿名函数？
是。
之间的区别go speak(c)
和
go func() {
speak(c)
}()
是，前者在新的goroutine中使用speak的值来调用c。然而，在后一种情况下，匿名函数捕获不值c但是变量c本身（通过引用¹），并在稍后的某个时间点调用speak c具有此时的'=========================================
Private Sub Worksheet_SelectionChange(ByVal Target As Range)
Dim str As String
Dim cboTemp As OLEObject
Dim ws As Worksheet
Set ws = ActiveSheet
On Error GoTo errHandler
If Target.Count > 1 Then GoTo exitHandler
Set cboTemp = ws.OLEObjects("ComboBox1")
On Error Resume Next
If cboTemp.Visible = True Then
With cboTemp
.Top = 10
.Left = 10
.ListFillRange = "Treatment"
.LinkedCell = Target.Address
.Visible = False
.Value = ""
End With
End If
On Error GoTo errHandler
If Target.Validation.Type = 3 Then
'if the cell contains a data validation list
Application.EnableEvents = False
'get the data validation formula
str = Target.Validation.Formula1
str = Right(str, Len(str) - 1)
With cboTemp
'show the combobox with the list
.Visible = True
.Left = Target.Left
.Top = Target.Top
.Width = Target.Width + 15
.Height = Target.Height + 5
.ListFillRange = ws.Range(str).Address
.LinkedCell = Target.Address
End With
cboTemp.Activate
'open the drop down list automatically
Me.ComboBox1.DropDown
End If
exitHandler:
Application.ScreenUpdating = True
Application.EnableEvents = True
Exit Sub
errHandler:
Resume exitHandler
End Sub
'====================================
'Optional code to move to next cell if Tab or Enter are pressed
'from code by Ted Lanham
'***NOTE: if KeyDown causes problems, change to KeyUp
'Table with numbers for other keys such as Right Arrow (39)
'https://msdn.microsoft.com/en-us/library/aa243025%28v=vs.60%29.aspx
Private Sub ComboBox1_KeyDown(ByVal _
KeyCode As MSForms.ReturnInteger, _
ByVal Shift As Integer)
Select Case KeyCode
Case 9 'Tab
ActiveCell.Offset(0, 1).Activate
Case 13 'Enter
ActiveCell.Offset(1, 0).Activate
Case Else
'do nothing
End Select
End Sub
'====================================
值。
¹：golang中没有“引用”，我不确定这是如何实现的，但就好像它们引用了原始变量一样。