例4.10.frm

来自「vb编程+从基础到实践光盘代码」· FRM 代码 · 共 54 行

VERSION 5.00
Begin VB.Form Form1 
   Caption         =   "Form1"
   ClientHeight    =   3195
   ClientLeft      =   60
   ClientTop       =   345
   ClientWidth     =   4680
   LinkTopic       =   "Form1"
   ScaleHeight     =   3195
   ScaleWidth      =   4680
   StartUpPosition =   3  '窗口缺省
   Begin VB.TextBox Txt2 
      Height          =   495
      Left            =   2880
      TabIndex        =   2
      Top             =   720
      Width           =   1215
   End
   Begin VB.TextBox Txt1 
      Height          =   495
      Left            =   720
      TabIndex        =   1
      Top             =   720
      Width           =   1215
   End
   Begin VB.CommandButton Command1 
      Caption         =   "看看参数是否被省略"
      Height          =   495
      Left            =   1440
      TabIndex        =   0
      Top             =   2160
      Width           =   1815
   End
End
Attribute VB_Name = "Form1"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
Private Sub Command1_Click()
    Call mysub1("abcd")
End Sub

Sub mysub1(var1 As String, Optional var2 As Integer)
                                                  
    Txt1.Text = var1
    If Not IsMissing(var2) Then              '判断参数是否被省略
        Txt2.Text = "参数被省略"
    Else
        Txt2.Text = var2
    End If
End Sub