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<td bgcolor="#ffff99" width="451">JavaScript教程 - 第五课</td>
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<td bgcolor="#FF6600" width="451"><a href="mailto:thau@wired.com">Thau</a></td>
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<td width="458" valign="top" align="left"><small><small><br>
</small></small><strong>第二页：<font SIZE="3">介绍反馈表单</font></strong> <p
ALIGN="JUSTIFY"> </p>
<p><font size="3" face="宋体">反馈表单是HTML 1.0规范的一部分。许多人对其并不很了解。<br>
很多人只以为它只能由于用户端CGI编程。其实，即使你不是<br>
CGI程序员，反馈表单也会为你提供许多功能。而JavaScript<br>
可被用来为反馈表单添加各种功能。而且无须用户端CGI的辅助。</font></p>
<p><font size="3" face="宋体">如果你不了解反馈表单如何工作，请学习HTML入门中的有关课<br>
程。然后在开始学习本课。</font></p>
<p><font size="3" face="宋体">首先，在javascript中，反馈表单也被存储在一个对象数组中。<br>
你可以通过<tt>window.document.images[0]</tt>调用图象数组中的第一<br>
幅图象，你也可以用<tt>window.document.forms[0]</tt>调用反馈表单<br>
数组中的第1项表单。你可以为图象命名，页可以以类似的方式<br>
为反馈表单命名。例如，如果该反馈表单</font></p>
<form name="first_form">
<p><font size="3" face="宋体"><input type="text" name="first_text" size="40"
value="Power to the primates!"> </font></p>
</form>
<font SIZE="3"><p>的编程如下： </font><ul>
<pre><font face="宋体"><big>
</big><form name="first_form">
<input type="text" name="first_text" size="40" <small>
</small>value="Power to the primates!">
</form>
</font></pre>
</ul>
<p><font SIZE="3">你可以用以下两种方式之一引用该表单： <ul>
<pre><font face="宋体">var the_form = window.document.forms[0];
var the_same_form = window.document.first_form;
</font></pre>
</ul>
<p>更多的时候，你需要引用到表单内的元素，例如上例中的文字域。<a
href="day5_3.html" tppabs="http://www.pchome.net/ch/tur/pstext/teacher/javascript/day5_3.html">>></a></p>
</font><p align="left"><font face="宋体" size="3" color="#000000"><strong>JavaScript教程</strong></font><font
color="#FF0000" face="宋体" size="3"><br>
</font><font size="3"><font color="#FF0000">第一页</font> <a href="day5_1.html" tppabs="http://www.pchome.net/ch/tur/pstext/teacher/javascript/day5_1.html">第五课课程介绍</a><br>
<font color="#FF0000">第二页</font> 介绍反馈表单<br>
<font color="#FF0000">第三页</font> <a href="day5_3.html" tppabs="http://www.pchome.net/ch/tur/pstext/teacher/javascript/day5_3.html">控制文字域的值</a><br>
<font color="#FF0000">第四页</font> <a href="day5_4.html" tppabs="http://www.pchome.net/ch/tur/pstext/teacher/javascript/day5_4.html">文字域事件</a><br>
<font color="#FF0000">第五页</font> <a href="day5_5.html" tppabs="http://www.pchome.net/ch/tur/pstext/teacher/javascript/day5_5.html">反馈表单处理器</a><br>
<font color="#FF0000">第六页</font> <a href="day5_6.html" tppabs="http://www.pchome.net/ch/tur/pstext/teacher/javascript/day5_6.html">文字域的练习</a><br>
<font color="#FF0000">第七页</font> <a href="day5_7.html" tppabs="http://www.pchome.net/ch/tur/pstext/teacher/javascript/day5_7.html">复选框</a><br>
<font color="#FF0000">第八页</font> <a href="day5_8.html" tppabs="http://www.pchome.net/ch/tur/pstext/teacher/javascript/day5_8.html">单选框</a><br>
<font color="#FF0000">第九页</font> <a href="day5_9.html" tppabs="http://www.pchome.net/ch/tur/pstext/teacher/javascript/day5_9.html">选单</a><br>
<font color="#FF0000">第十页</font> <a href="day5_10.html" tppabs="http://www.pchome.net/ch/tur/pstext/teacher/javascript/day5_10.html">在选单中应用<font
face="宋体">onchange</font>命令</a></font></p>
<p align="left"><font face="宋体" size="3">[<a href="index.html" tppabs="http://www.pchome.net/ch/tur/pstext/teacher/javascript/index.html">第1课</a>][<a
href="day2_1.html" tppabs="http://www.pchome.net/ch/tur/pstext/teacher/javascript/day2_1.html">第2课</a>][<a href="day3_1.html" tppabs="http://www.pchome.net/ch/tur/pstext/teacher/javascript/day3_1.html">第3课</a>][<a href="day4_1.html" tppabs="http://www.pchome.net/ch/tur/pstext/teacher/javascript/day4_1.html">第4课</a>][第5课]</font></p>
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