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<title>第四章：按钮</title>
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<td width="100%" valign="top" align="center"><a name="top"><font size="5" color="#C0C0C0"><strong>VB入门教程</strong></font></a></td>
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</center></div><p>第一页 <a href="class_book_begin042.htm">第二页</a> <a href="class_book_begin043.htm">第三页</a> <a href="class_book_begin044.htm">第四页</a><br>
<a href="class_book_begin045.htm">第五页</a> <a href="class_book_begin046.htm">第六页</a>
<a href="class_book_begin047.htm">第七页</a> <a href="../class_book.htm">返回</a>
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<td width="100%"><font size="3" color="#8000FF"><strong><em>第四章：按钮（1）</em></strong></font></td>
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<td width="100%" style="background-color: rgb(232,255,254)"><font FACE="宋体" SIZE="3"><p ALIGN="JUSTIFY"></font><strong>从本章开始我们将正式进入VB的编程世界，但这还仅仅是个开端，要编出功能强大的软件，还要学很多东西，那就要看以后的VB高级教程了，我也得努力学啊！</strong></p>
<p ALIGN="JUSTIFY"><strong>按钮是我们在Windows操作见到最多的控件，它们有着各种各样的功能：“确认”、“取消”、“下一步”等等，这些都是按钮的表现，另外还有很多图形话的按钮，其实它们并没什么不同，所有的按钮都是通过单击（click）事件实现的，只不过是在外表不同罢了。下面就让我们建立一个最简单的按钮，双击工具箱的CommandButton，将在窗体上建立一个形如图4－1<img src="0401.gif" alt="04－01.gif (277 字节)" align="absmiddle" WIDTH="81" HEIGHT="33">的按钮，它的缺省名（Name属性）为Command1，我们可以把它改名为cmdExit，把Caption属性设为“退出”，然后双击，按钮填写代码：</strong></p>
<p ALIGN="JUSTIFY"><font color="#004080"><strong>Private Sub cmdExit_Click()</strong></font></p>
<blockquote>
<p ALIGN="JUSTIFY"><font color="#004080"><strong>Unload Me</strong></font></p>
</blockquote>
<p ALIGN="JUSTIFY"><font color="#004080"><strong>End Sub</strong></font></p>
<p ALIGN="JUSTIFY"><img src="0402.gif" alt="04－02.gif (1715 字节)" WIDTH="320" HEIGHT="240"></p>
<p ALIGN="JUSTIFY"><strong>按下F5或者工具条上的播放按钮，运行程序。图4－2当你按下退出按钮的时候，就会自动退出程序，原因是当你单击按钮时激活了它的Click事件，执行“Unload
Me”语句，使得窗体被卸载。</strong></td>
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