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    <title>Re: 请各位高手帮忙！！</title>
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      <h1>Re: 请各位高手帮忙！！</h1>
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Posted by Kent on November 03, 1998 at 23:36:42:<p>
In Reply to: <a href="7059.html">请各位高手帮忙！！</a> posted by 小毛 on November 03, 1998 at 23:03:19:<p>
: 小弟刚开始学习VB，搞不清楚有关"选择性引数(Optional)"的意思，<br>: 请各位高手帮忙解释一下下！！<br>: 底下有一段程式码，执行时会出现"必须是叙述句结尾"的错误讯息，<br>: 请各位高手帮忙Debug一下，谢谢！！<br>: Dim strName As String<br>: Dim varAddress As Variant<p>: Sub ListText (Optional x As String, Optional y _<br>: As Variant)<br>: 	List1.AddItem x<br>: 	List1.AddItem y<br>: End Sub<p>: Private Sub Command1_Click ()<br>: 	strName = "yourname"<br>:  Optional <br>: 	varAddress = 12345	' 两个引数都有提供。<br>: 	Call ListText (strName, varAddress)<br>: End Sub<p>>所谓optional 就是这个引数可以传,可以不传,可或不可,所以叫选择性,但若你允许不传的话,最好有预设值,不然程式中引用到的话,还是会出错<br>>程式中的optional是多余的,拿掉就正常了<br>: Private Sub Command1_Click ()<br>: 	strName = "yourname"<br>: 	varAddress = 12345<br>: 	Call ListText (strName, varAddress)<br>: End Sub<p>
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