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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>第一页:<font size="3">第五课课程介绍</font></strong> <p><font
    size="3">现在你已经了解了计算机编程的基本知识。我们接下来继续研<br>
    究一下文件对象模块(<font face="宋体">Document Object Model</font>-<font
    face="宋体">DOM</font>)。<font face="宋体">DOM</font>的<br>
    点击关系起始于窗口对象在每个窗口对象中是一个文件对象<br>
    (<font face="宋体">Document object</font>)。我们将重点谈谈文件对象,看看如何利<br>
    用它从你的用户获得各项信息,并且动态显示新的信息。</font></p>
    <font size="3"><p>我们已经看国文件对象的一个属性-图象数组(<font
    face="宋体">Images<br>
    array</font>)。在第<font face="宋体">3</font>课中,文件中第<font
    face="宋体">1</font>个图象可以通过改变其<font face="宋体">src</font>属<br>
    性被修改。 </p>
    <p>例: <ul>
      <pre><font face="宋体">window.document.images[0].src='some_new_picture.gif';
</font></pre>
    </ul>
    <p>该命令将把文件中的第1个图象该到一个<tt>名为<br>
    <font face="宋体">some_new_picture.gif</font></tt>的新图象。在DOM中,图象数组中的每个<br>
    图象也是对象。所以<font face="宋体"><tt>images[0].src</tt></font>指令象对对象那样发挥作用,<br>
    它的意思就是:从<font face="宋体">Image</font>数组中调用<font face="宋体">Image</font>的中的对象<tt><font
    face="宋体">image[0]</font></tt>,<br>
    并设定其<font face="宋体">src</font>属性。将其翻译过来即:从该窗口中调用文件<br>
    (<font face="宋体">document</font>)属性,从该文件的图象数组中调用第<font
    face="宋体">1</font>幅图象,并<br>
    将其<font face="宋体">src</font>属性该为<tt>图象<font face="宋体">some_new_picture.gif</font></tt>。</p>
    </font><p><font size="3"><font face="宋体">Image</font>对象还有其它很多有趣的属性,例如,你可以让<font
    face="宋体">JavaScript</font><br>
    在作其它事之前检查一幅图象是否已经完全载入。但是,我们<br>
    只能在以后的课程中谈到这些属性。今天,我们将谈谈<a
    href="day5_2.html" tppabs="http://www.pchome.net/ch/tur/pstext/teacher/javascript/day5_2.html">反馈表单</a><br>
    及如何在<font face="宋体">JavaScript</font>中应用反馈表单。</font></p>
    <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> 第五课课程介绍<br>
    <font color="#FF0000">第二页</font> <a href="day5_2.html" tppabs="http://www.pchome.net/ch/tur/pstext/teacher/javascript/day5_2.html">介绍反馈表单</a><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>
    <hr align="left">
    <p><font size="2">本文由<a href="javascript:if(confirm('http://chd.126.com/  \n\nThis file was not retrieved by Teleport Pro, because it is addressed on a domain or path outside the boundaries set for its Starting Address.  \n\nDo you want to open it from the server?'))window.location='http://chd.126.com/'" tppabs="http://chd.126.com/" target="_blank">《</font><font
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