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<title>JavaScrip教程</title>
 <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">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">介绍反馈表单</a><br>
        <font color="#FF0000">第三页</font> <a href="day5_3.html">控制文字域的值</a><br>
        <font color="#FF0000">第四页</font> <a href="day5_4.html">文字域事件</a><br>
        <font color="#FF0000">第五页</font> <a href="day5_5.html">反馈表单处理器</a><br>
        <font color="#FF0000">第六页</font> <a href="day5_6.html">文字域的练习</a><br>
        <font color="#FF0000">第七页</font> <a href="day5_7.html">复选框</a><br>
        <font color="#FF0000">第八页</font> <a href="day5_8.html">单选框</a><br>
        <font color="#FF0000">第九页</font> <a href="day5_9.html">选单</a><br>
        <font color="#FF0000">第十页</font> <a href="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">第1课</a>][<a href="day2_1.html">第2课</a>][<a href="day3_1.html">第3课</a>][<a href="day4_1.html">第4课</a>][第5课]</font></p>
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