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<td bgcolor="#ffff99" width="451">JavaScript教程 - 第四课</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"><strong><small><small><br>
</small></small><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="3"><font face="宋体">下面是<tt>onClick=""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></font></pre>
</ul>
<p><font face="宋体" SIZE="3">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></p>
<p><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 face="宋体" SIZE="3">
for (loop = 0; loop < document.images.length; loop++)
{
document.images[loop].src = 'spacer.gif';
}
</font></pre>
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<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 face="宋体" size="3">进入<a href="day4_11.html" tppabs="http://www.pchome.net/ch/tur/pstext/teacher/javascript/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" tppabs="http://www.pchome.net/ch/tur/pstext/teacher/javascript/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" tppabs="http://www.pchome.net/ch/tur/pstext/teacher/javascript/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" tppabs="http://www.pchome.net/ch/tur/pstext/teacher/javascript/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" tppabs="http://www.pchome.net/ch/tur/pstext/teacher/javascript/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" tppabs="http://www.pchome.net/ch/tur/pstext/teacher/javascript/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" tppabs="http://www.pchome.net/ch/tur/pstext/teacher/javascript/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" tppabs="http://www.pchome.net/ch/tur/pstext/teacher/javascript/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" tppabs="http://www.pchome.net/ch/tur/pstext/teacher/javascript/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" tppabs="http://www.pchome.net/ch/tur/pstext/teacher/javascript/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" tppabs="http://www.pchome.net/ch/tur/pstext/teacher/javascript/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" tppabs="http://www.pchome.net/ch/tur/pstext/teacher/javascript/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" tppabs="http://www.pchome.net/ch/tur/pstext/teacher/javascript/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" tppabs="http://www.pchome.net/ch/tur/pstext/teacher/javascript/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" 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>][第4课][<a
href="day5_1.html" tppabs="http://www.pchome.net/ch/tur/pstext/teacher/javascript/day5_1.html">第5课</a>]</font></p>
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