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<title>javascrip教程</title>
 <strong><font face="宋体" size="3">第十页：</font><font size="3">文件目标模块中的数组</font></strong> 
      <p><font size="2"></font>
      <font size="3"><font face="宋体">下面是<tt>onClick=&quot;&quot;链</tt>接中的代码：</font> 
      <ul>
        <pre><font face="宋体">
var change=prompt('Change which image (0 or 1)?','');

window.document.images[change].src='three.jpg';

</font></pre>
      </ul>
      <p><font face="宋体">本例打算用图片交换来演示数组如何介入DOM的。如果你用的<br>
        是IE3.0或Netscape2.0，赶紧升级。试一下本例，看一下源码。</font>
      <ul>
        <pre><font face="宋体">
document.image_name.src = 'some_image.gif';

</font></pre>
      </ul>
      </font> 
      <p><font size="3"><font face="宋体">为了做这事，每个图片都需命名到。若你不知要交换的图片<br>
        名，但却知道其在HTML页中的顺序。可以用它的DOM数来指定该<br>
        图片。</font></font></p>
      <p> <font size="2"></font><font face="宋体" size="3">一个HTML文件中的第一个图片是document.images[0]，第二个<br>
        是document.images[1]，如此类推。若你想知道一个文件中有<br>
        多少个图片，你可检查图片数组长度知道：<br>
        document.imageslength。例如，你想改变你的网页中所有图形<br>
        为一个Spacer GLF图片，你可以这样做：</font>
      <ul>
        <pre>
      <font size="2"></font><font size="3"><font face="宋体">

for (loop = 0; loop &lt; document.images.length; loop++)

{

	document.images[loop].src = 'spacer.gif';

}

</font></font></pre>
      </ul>
      <font size="3"> 
      <p align="JUSTIFY"><font face="宋体">清楚了吧？</font></p>
      <p align="JUSTIFY"><font face="宋体">好。下面我们准备三步是函数。函数学习中，我们要做一些<br>
        练习，并有一些作业。</font></p>
      </font> 
      <p align="JUSTIFY"><font size="3"><font face="宋体">进入</font></font><font face="宋体" size="3"><a href="day4_11.html">函数</a>学习课程。</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" color="#FF0000">第一页</font><font size="2" face="宋体"> 
        </font><a href="day4_10.html"><font size="3">第四课介绍</font></a><font size="2"><br>
        </font><font size="3"><font color="#FF0000">第二页</font> <a href="day4_2.html">循环介绍</a></font><font size="2"><br>
        </font><font size="3"><font color="#FF0000">第三页</font> <a href="day4_3.html">循环的密码</a></font><font size="2"><br>
        </font><font size="3"><font color="#FF0000">第四页</font> <a href="day4_4.html">再谈<font face="宋体">WHILE</font>循环</a></font><font size="2"><br>
        </font><font size="3"><font color="#FF0000">第五页</font> <a href="day4_5.html">For循环</a></font><font size="2"><br>
        </font><font size="3"><font color="#FF0000">第六页</font> <a href="day4_6.html">嵌套循环</a></font><font size="2"><br>
        </font><font size="3"><font color="#FF0000">第七页</font> <a href="day4_7.html">循环练习</a></font><font size="2"><br>
        </font><font size="3"><font color="#FF0000">第八页</font> <a href="day4_8.html">数组</a></font><font size="2"><br>
        </font><font size="3"><font color="#FF0000">第九页</font> <a href="day4_9.html">数组和循环</a></font><font size="2"><br>
        </font><font size="3"><font color="#FF0000">第十页</font> 文件目标模块中的数组</font><font size="2"><br>
        </font><font size="3"><font color="#FF0000">第十一页</font> <a href="day4_11.html">函数</a></font><font size="2"><br>
        </font><font size="3"><font color="#FF0000">第十二页</font> <a href="day4_12.html">无参数函数</a></font><font size="2"><br>
        </font><font size="3"><font color="#FF0000">第十三页</font> <a href="day4_13.html">参数及返回值</a></font><font size="2"><br>
        </font><font size="3"><font color="#FF0000">第十四页</font> <a href="day4_14.html">多于一个参数的函数</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>][第4课][<a href="day5_1.html">第5课</a>]</font></p>
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