📄 例8-11.mht
字号:
#20256;递一个参数，而另=
968;个传递两个参数，如=
;图</span><span
lang=3DEN-US>8-18</span><span style=3D'font-family:SimSun;mso-ascii-font-fa=
mily:
"Times New Roman";mso-hansi-font-family:"Times New Roman"'>所示=
。</span></p>
<p class=3DMsoNormal align=3Dcenter style=3D'text-align:center'><span lang=
=3DEN-US><!--[if gte vml 1]><v:shapetype
id=3D"_x0000_t75" coordsize=3D"21600,21600" o:spt=3D"75" o:preferrelative=
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path=3D"m@4@5l@4@11@9@11@9@5xe" filled=3D"f" stroked=3D"f">
<v:stroke joinstyle=3D"miter"/>
<v:formulas>
<v:f eqn=3D"if lineDrawn pixelLineWidth 0"/>
<v:f eqn=3D"sum @0 1 0"/>
<v:f eqn=3D"sum 0 0 @1"/>
<v:f eqn=3D"prod @2 1 2"/>
<v:f eqn=3D"prod @3 21600 pixelWidth"/>
<v:f eqn=3D"prod @3 21600 pixelHeight"/>
<v:f eqn=3D"sum @0 0 1"/>
<v:f eqn=3D"prod @6 1 2"/>
<v:f eqn=3D"prod @7 21600 pixelWidth"/>
<v:f eqn=3D"sum @8 21600 0"/>
<v:f eqn=3D"prod @7 21600 pixelHeight"/>
<v:f eqn=3D"sum @10 21600 0"/>
</v:formulas>
<v:path o:extrusionok=3D"f" gradientshapeok=3D"t" o:connecttype=3D"rect"/>
<o:lock v:ext=3D"edit" aspectratio=3D"t"/>
</v:shapetype><v:shape id=3D"_x0000_i1025" type=3D"#_x0000_t75" style=3D'wi=
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height:88.2pt'>
<v:imagedata src=3D"file6945.files/image001.png" o:title=3D""/>
</v:shape><![endif]--><![if !vml]><img width=3D198 height=3D118
src=3D"file6945.files/image002.jpg" v:shapes=3D"_x0000_i1025"><![endif]></s=
pan></p>
<h6><span style=3D'font-family:SimSun;mso-ascii-font-family:"Times New Roma=
n";
mso-hansi-font-family:Roman'>图</span><span lang=3DEN-US>8-18<span
style=3D'mso-spacerun:yes'> </span></span><span style=3D'font-family:=
SimSun;
mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:Roman'>߳=
1;用可选参数示例</span></h6>
<p class=3DMsoNormal><span lang=3DEN-US><span
style=3D'mso-spacerun:yes'> </span>Sub</span><span
style=3D'font-family:SimSun;mso-ascii-font-family:"Times New Roman";mso-han=
si-font-family:
"Times New Roman"'>过程</span><span class=3DSpellE><span lang=
=3DEN-US>ListText</span></span><span
style=3D'font-family:SimSun;mso-ascii-font-family:"Times New Roman";mso-han=
si-font-family:
"Times New Roman"'>将传递过来的参=
数值添加到列表框中=
5292;其中第</span><span
lang=3DEN-US>2</span><span style=3D'font-family:SimSun;mso-ascii-font-famil=
y:"Times New Roman";
mso-hansi-font-family:"Times New Roman"'>个参数使&#=
29992;</span><span
lang=3DEN-US>Optional</span><span style=3D'font-family:SimSun;mso-ascii-fon=
t-family:
"Times New Roman";mso-hansi-font-family:"Times New Roman"'>关键=
字，该过程的代码为=
5306;</span></p>
<p class=3Da><b style=3D'mso-bidi-font-weight:normal'><span lang=3DEN-US>Pr=
ivate Sub <span
class=3DSpellE>ListText</span>(x As String, Optional y As String)<o:p></o:p=
></span></b></p>
<p class=3Da><span lang=3DEN-US><span style=3D'mso-spacerun:yes'> </s=
pan>If <span
class=3DSpellE>IsMissing</span>(y) Then<span
style=3D'mso-spacerun:yes'> </span><span
style=3D'mso-tab-count:4'> &=
nbsp; &nbs=
p; =
</span>'
</span><span style=3D'font-family:SimSun;mso-ascii-font-family:"Times New R=
oman";
mso-hansi-font-family:"Times New Roman"'>用</span><span class=3DSpell=
E><span
lang=3DEN-US>IsMissing</span></span><span style=3D'font-family:SimSun;mso-a=
scii-font-family:
"Times New Roman";mso-hansi-font-family:"Times New Roman"'>函数=
测试丢失的可选参数</s=
pan></p>
<p class=3Da><span lang=3DEN-US><span style=3D'mso-spacerun:yes'> &nbs=
p;
</span>temp =3D Format(x, "@@@@@@@@@@")</span></p>
<p class=3Da><span lang=3DEN-US><span style=3D'mso-spacerun:yes'> </s=
pan>Else</span></p>
<p class=3Da><span lang=3DEN-US><span style=3D'mso-spacerun:yes'> &nbs=
p;
</span>temp =3D Format(x, "@@@@@@@@@@") & Format(y,
"@@@@@@@@@@")</span></p>
<p class=3Da><span lang=3DEN-US><span style=3D'mso-spacerun:yes'> </s=
pan>End If</span></p>
<p class=3Da><span lang=3DEN-US><span style=3D'mso-spacerun:yes'>
</span>List1.AddItem temp<span style=3D'mso-spacerun:yes'> </span><sp=
an
style=3D'mso-tab-count:5'> &=
nbsp; &nbs=
p; &=
nbsp; </span>'
</span><span style=3D'font-family:SimSun;mso-ascii-font-family:"Times New R=
oman";
mso-hansi-font-family:"Times New Roman"'>在列表框&#=
20013;添加项目</span></p>
<p class=3Da><b style=3D'mso-bidi-font-weight:normal'><span lang=3DEN-US>En=
d Sub<o:p></o:p></span></b></p>
<p class=3DMsoNormal><span lang=3DEN-US><span
style=3D'mso-spacerun:yes'> </span></span><span
style=3D'font-family:SimSun;mso-ascii-font-family:"Times New Roman";mso-han=
si-font-family:
"Times New Roman"'>传递一个参数的=
命令按钮</span><span
lang=3DEN-US>Command1</span><span style=3D'font-family:SimSun;mso-ascii-fon=
t-family:
"Times New Roman";mso-hansi-font-family:"Times New Roman"'>的</span><=
span
lang=3DEN-US>Click</span><span style=3D'font-family:SimSun;mso-ascii-font-f=
amily:
"Times New Roman";mso-hansi-font-family:"Times New Roman"'>事件=
代码为：</span></p>
<p class=3Da><b style=3D'mso-bidi-font-weight:normal'><span lang=3DEN-US>Pr=
ivate Sub
Command1_Click()<o:p></o:p></span></b></p>
<p class=3Da><span lang=3DEN-US><span style=3D'mso-spacerun:yes'> </s=
pan>Dim a
As String</span></p>
<p class=3Da><span lang=3DEN-US><span style=3D'mso-spacerun:yes'> </s=
pan>a =3D <span
class=3DSpellE>InputBox</span>("")<span style=3D'mso-spacerun:yes=
'>
</span><span style=3D'mso-tab-count:6'> =
&nb=
sp; =
&nb=
sp; </span>'
</span><span style=3D'font-family:SimSun;mso-ascii-font-family:"Times New R=
oman";
mso-hansi-font-family:"Times New Roman"'>通过输入&#=
26694;输入变量的值</span></p>
<p class=3Da><span lang=3DEN-US><span style=3D'mso-spacerun:yes'> </s=
pan>Call <span
class=3DSpellE>ListText</span>(a)<span
style=3D'mso-spacerun:yes'> </span><span style=3D'mso-tab=
-count:
5'> =
&nb=
sp; </span>'
</span><span style=3D'font-family:SimSun;mso-ascii-font-family:"Times New R=
oman";
mso-hansi-font-family:"Times New Roman"'>带一个实&#=
21442;调用过程</span></p>
<p class=3Da><b style=3D'mso-bidi-font-weight:normal'><span lang=3DEN-US>En=
d Sub<o:p></o:p></span></b></p>
<p class=3DMsoNormal><span lang=3DEN-US><span
style=3D'mso-spacerun:yes'> </span></span><span
style=3D'font-family:SimSun;mso-ascii-font-family:"Times New Roman";mso-han=
si-font-family:
"Times New Roman"'>传递两个参数的=
命令按钮</span><span
lang=3DEN-US>Command2</span><span style=3D'font-family:SimSun;mso-ascii-fon=
t-family:
"Times New Roman";mso-hansi-font-family:"Times New Roman"'>的</span><=
span
lang=3DEN-US>Click</span><span style=3D'font-family:SimSun;mso-ascii-font-f=
amily:
"Times New Roman";mso-hansi-font-family:"Times New Roman"'>事件=
代码为：</span></p>
<p class=3Da><b style=3D'mso-bidi-font-weight:normal'><span lang=3DEN-US>Pr=
ivate Sub
Command2_Click()<o:p></o:p></span></b></p>
<p class=3Da><span lang=3DEN-US><span style=3D'mso-spacerun:yes'> </s=
pan>Dim a
As String, b As String</span></p>
<p class=3Da><span lang=3DEN-US><span style=3D'mso-spacerun:yes'> </s=
pan>a =3D <span
class=3DSpellE>InputBox</span>("")<span style=3D'mso-spacerun:yes=
'>
</span><span style=3D'mso-tab-count:6'> =
&nb=
sp; =
&nb=
sp; </span>'
</span><span style=3D'font-family:SimSun;mso-ascii-font-family:"Times New R=
oman";
mso-hansi-font-family:"Times New Roman"'>通过输入&#=
26694;输入变量的值</span></p>
<p class=3Da><span lang=3DEN-US><span style=3D'mso-spacerun:yes'> </s=
pan>b =3D <span
class=3DSpellE>InputBox</span>("")<span style=3D'mso-spacerun:yes=
'>
</span><span style=3D'mso-tab-count:6'> =
&nb=
sp; =
&nb=
sp; </span>'
</span><span style=3D'font-family:SimSun;mso-ascii-font-family:"Times New R=
oman";
mso-hansi-font-family:"Times New Roman"'>通过输入&#=
26694;输入变量的值</span></p>
<p class=3Da><span lang=3DEN-US><span style=3D'mso-spacerun:yes'> </s=
pan>Call <span
class=3DSpellE>ListText</span>(a, b)<span
style=3D'mso-spacerun:yes'> </span><span style=3D'mso-tab=
-count:
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