VBS基础篇 - 循环(for、Do、While)

For counter = start To end [Step step] 'counter 用做循环计数器的数值变量， start：counter的初值， end：counter的终值， step：counter的步长
  [statements]
  [Exit For] '退出循环
  [statements]
Next 

Dim Count:Count = 0 '定义一个变量，并赋值为0
For i = 1 To 10 '循环10次 ，For 语句规定计数变量以及它的开始值和结束值
  Count = Count + 1
Next 'Next 语句会以 1 作为步长来递增变量i
MsgBox Count '输出10 '

退出循环：Exit For 语句用于在计数器达到其终止值之前退出 For...Next 语句。

Dim Count:Count = 0 '定义一个变量，并赋值为0
For i = 1 To 10 step 2 '循环10次，步长为2，通过使用 Step 关键词，我们可以规定计数变量递增或递减的步进值
  Count = Count + 1
  If Count = 3 Then '当变量Count的值为3时，退出当前循环
    Exit For '退出循环
  End If
Next
MsgBox Count '输出3

For counter = start To end [Step step]
  [statements]
  [Exit For]
  [statements]
Next

Dim Count:Count = 0 '定义一个变量，并赋值为0
For i = 1 To 10 '循环10次
  Count = Count + 1
Next
MsgBox Count '输出10

Dim Count:Count = 0 '定义一个变量，并赋值为0
For i = 1 To 10 Step 2 '设置计数器步长为2，循环5次
  Count = Count + 1
Next
MsgBox Count '输出5

Dim Count:Count = 0 '定义一个变量，并赋值为0
For i = 1 To 10 '循环10次
  Count = Count + 1
  If Count = 5 Then '当变量Count的值为5时，退出当前循环
    Exit For
  End If
Next
MsgBox Count '输出5

重复执行语句直到条件变为True

Dim Count:Count = 5 '定义一个变量
Do Until Count = 0 '直到Count变量为0时，否则一直循环
  MsgBox Count
  Count = Count -1
Loop
MsgBox "循环结束"

Dim Count:Count = 5 '定义一个变量
Do
  MsgBox Count
  Count = Count -1
Loop Until Count = 0 '直到Count变量为0时，否则一直循环
MsgBox "循环结束"

当条件变为True之前重复执行某语句块

Dim Count:Count = 5 '定义一个变量
Do While Count <> 0 '当Count变量为0时，停止循环
  MsgBox Count
  Count = Count -1
Loop
MsgBox "循环结束"

Dim Count:Count = 5 '定义一个变量
Do
  MsgBox Count
  Count = Count -1
Loop While Count <> 0 '当Count变量为0时，停止循环
MsgBox "循环结束"

Exit Do 语句用于退出 Do...Loop 循环

Dim Count:Count = 5 '定义一个变量
Do While Count <> 0 '当Count变量为0时，停止循环
  MsgBox Count
  Count = Count -1
  If Count = 2 Then '判断Count变量值是否为2，如果是则退出循环
    Exit Do
  End If
Loop
MsgBox "循环结束"

Dim Count:Count = 5 '定义一个变量
While Count <> 0 '当Count变量值不等于0，一直循环
  MsgBox Count
  Count = Count -1 
Wend
MsgBox "循环结束"

While…Wend 没有Exit语句，从头一直循环到尾，若要在中途退出，则需用Do…Loop语句

Dim Dics '定义一个变量
Set Dics = CreateObject("Scripting.Dictionary") '定义一个Dictionary对象
Dics.Add "0", "Athens"  '为Dictionary对象赋值
Dics.Add "1", "Belgrade"
Dics.Add "2", "Cairo"
For Each Dic in Dics
  MsgBox Dics.Item(Dic) '循环遍历，且输出Dictionary键值
Next