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<td bgcolor="#ffff99" width="451">JavaScript教程 - 第三课</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">第九页：</font><font size="3">再谈</font></strong><b><font
size="2" face="宋体">JavaScript DOM</font></b> <p><font size="3">现在我们已经了解了：<font
face="宋体">JavaScript</font>包括缺省对象，例如窗口，<br>
对象具有用于描述对象的属性，方法用于描述对象采取行动<br>
的方法。</font></p>
<p><font size="3">对象的属性页可以是对象。举例来说：窗口有一个属性叫做<br>
<font face="宋体"><tt>document</tt></font>，它用于引用到窗口中实际的<font
face="宋体">HTML</font>文件。该<font face="宋体"><tt>document</tt></font><br>
属性本身就是一个对象。在谈到图象掉换（<font face="宋体">image swap)</font>的时<br>
候，我们见到过这样的例子。你可以用下列语句作图象掉换<font
face="宋体">:</font></font></p>
<p><font face="宋体" size="3"><a href="#"
onMouseOver="window.document.the_image.src='button_d.gif';">change</a><br>
<br>
</font></p>
<font size="3"><p>上述语句的意思是说：找到<font face="宋体">window</font>的<font
face="宋体">document</font>属性，找到<br>
<font face="宋体"><tt>the_image</tt></font>的<font face="宋体">src</font>属性并将其设置为图象<font
face="宋体"><tt>button_d.gif</tt></font>。这样写<br>
是因为窗口（<font face="宋体">windows</font>）是对象，窗口内的文件（<font
face="宋体">documents</font>）<br>
是对象，而文件（<font face="宋体">document</font>）内的图象（<font
face="宋体">images</font>）页是对象。</p>
<p>看起来似乎很复杂，但它的结构很清楚。<font face="宋体">JavaScript</font>的文件对<br>
象模块（<font face="宋体">Document Object Model</font>）描述了对象之间的等级关系。</p>
<p>在该教程中，我们只看到该等级关系的一部分。使你的网页具有<br>
精彩动感的大多数技巧都涉及到文件对象。文件对象内容非常丰<br>
富，实际上应该专门开一门教程将这个问题。在本课程中，我们<br>
将集中谈谈<a href="day3_10.html" tppabs="http://www.pchome.net/ch/tur/pstext/teacher/javascript/day3_10.html">窗口的其它属性</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" color="#FF0000">第</font><font color="#FF0000" face="宋体"
size="3">一</font><font size="3" color="#FF0000">页</font><font size="2" face="宋体"> </font><a
href="day3_9.html" tppabs="http://www.pchome.net/ch/tur/pstext/teacher/javascript/day3_9.html"><font size="3">第三天课程简介</font></a><font size="2"><br>
</font><font size="3" color="#FF0000">第</font><font face="宋体" size="3"
color="#FF0000">二</font><font size="3" color="#FF0000">页</font><font size="2"
face="宋体"> </font><a href="day3_2.html" tppabs="http://www.pchome.net/ch/tur/pstext/teacher/javascript/day3_2.html"><font size="3">窗口操作介绍</font></a><font
size="2"><br>
</font><font size="3" color="#FF0000">第</font><font face="宋体" size="3"
color="#FF0000">三</font><font size="3" color="#FF0000">页</font><font size="2"
face="宋体"> </font><a href="day3_3.html" tppabs="http://www.pchome.net/ch/tur/pstext/teacher/javascript/day3_3.html"><font size="3"><strong>Javascript</strong>中的窗口操作</font></a><font
size="2"><br>
</font><font size="3" color="#FF0000">第</font><font face="宋体" size="3"
color="#FF0000">四</font><font size="3" color="#FF0000">页</font><a href="day3_4.html" tppabs="http://www.pchome.net/ch/tur/pstext/teacher/javascript/day3_4.html"> <font
size="2" face="宋体"><b>JavaScript</b></font><font size="3">中的窗口操作举例</font></a><font
size="2"><br>
</font><font size="3" color="#FF0000">第</font><font face="宋体" size="3"
color="#FF0000">五</font><font size="3" color="#FF0000">页</font><a href="day3_5.html" tppabs="http://www.pchome.net/ch/tur/pstext/teacher/javascript/day3_5.html"> <font
size="2" face="宋体"><b>Windows</b></font><font size="3">特性</font></a><font size="2"><br>
</font><font size="3" color="#FF0000">第</font><font face="宋体" size="3"
color="#FF0000">六</font><font size="3" color="#FF0000">页</font><a href="day3_6.html" tppabs="http://www.pchome.net/ch/tur/pstext/teacher/javascript/day3_6.html"> <font
size="2" face="宋体"><b>JavaScript</b></font><font size="3">文件目标模块</font></a><font
size="2"><br>
</font><font size="3" color="#FF0000">第</font><font face="宋体" size="3"
color="#FF0000">七</font><font size="3" color="#FF0000">页</font><font size="2"
face="宋体"> </font><a href="day3_7.html" tppabs="http://www.pchome.net/ch/tur/pstext/teacher/javascript/day3_7.html"><font size="3">状态条的操作</font></a><font
size="2"><br>
</font><font size="3" color="#FF0000">第</font><font face="宋体" size="3"
color="#FF0000">八</font><font size="3" color="#FF0000">页</font><font size="2"
face="宋体"> </font><a href="day3_8.html" tppabs="http://www.pchome.net/ch/tur/pstext/teacher/javascript/day3_8.html"><font size="3">窗口间的交流</font></a><font
size="2"><br>
</font><font size="3" color="#FF0000">第</font><font face="宋体" size="3"
color="#FF0000">九</font><font size="3" color="#FF0000">页</font><font size="2"
face="宋体"> </font><font size="3">再谈</font><font size="2" face="宋体"><b>JavaScript
DOM</b><br>
</font><font size="3" color="#FF0000">第</font><font face="宋体" size="3"
color="#FF0000">十</font><font size="3" color="#FF0000">页</font><font size="2"
face="宋体"> </font><a href="day3_10.html" tppabs="http://www.pchome.net/ch/tur/pstext/teacher/javascript/day3_10.html"><font size="3">窗口的其它特性</font></a><font
size="2"><br>
</font><font size="3" color="#FF0000">第</font><font face="宋体" size="3"
color="#FF0000">十一</font><font size="3" color="#FF0000">页</font><font size="2"
face="宋体"> </font><a href="day3_11.html" tppabs="http://www.pchome.net/ch/tur/pstext/teacher/javascript/day3_11.html"><font size="3">再谈</font><font size="2"
face="宋体"><b>Window</b></font><font size="3">及</font><font size="2" face="宋体"><b>Frame</b></font><font
size="3">树杈结构</font></a><font size="2"><br>
</font><font size="3" color="#FF0000">第</font><font face="宋体" size="3"
color="#FF0000">十二</font><font size="3" color="#FF0000">页</font><font size="2"
face="宋体"> </font><a href="day3_12.html" tppabs="http://www.pchome.net/ch/tur/pstext/teacher/javascript/day3_12.html"><font size="3">自己动手操作</font></a><font
size="2"><br>
</font><font size="3" color="#FF0000">第</font><font face="宋体" size="3"
color="#FF0000">十三</font><font size="3" color="#FF0000">页</font><font size="2"
face="宋体"> </font><a href="day3_13.html" tppabs="http://www.pchome.net/ch/tur/pstext/teacher/javascript/day3_13.html"><font size="3">第三天复习</font></a></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>][第3课][<a href="day4_1.html" tppabs="http://www.pchome.net/ch/tur/pstext/teacher/javascript/day4_1.html">第4课</a>][<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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