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<html><head><meta http-equiv="Content-Type" content="text/html; charset=gb2312-80"><style type="text/css"><!--a:link { color: blue; text-decoration: none}a:visited { color: purple; text-decoration: none}a:hover { color: #CC0033; text-decoration: underline}--></style><title>JavaScript高级教程</title><script language="JavaScript"><!-- hide me// timedAlert// this just calls a function timedAlert(){ var the_timeout = setTimeout("alertAndRedirect();", 3000);}function alertAndRedirect(){ alert('OK! Exhale!'); window.location.replace("day3_2.html");}// show me --></script></head><body topmargin="1" leftmargin="2"><table border="0" width="591" cellspacing="0"> <tr> <td bgcolor="#ffff99" width="451">JavaScript高级教程 - 第四课</td> </tr> <tr> <td bgcolor="#FF6600" width="451"><a href="mailto:thau@wired.com">Thau</a></td> </tr></table><div align="left"> <table border="0" width="630" cellspacing="0"> <tr> <td width="591" valign="top" align="left" rowspan="2"><small><small><br> </small></small><strong>第十页：<font size="3">另一种获取难以索引的对象的手段</font></strong> <p><font size="3"> </font></p> <table width="449"> <tr> <td width="445"> <font face="helvetica, arial, sans-serif" size="2"></font><font size="3">这就是我们迄今为止学到的获取图象对象的手段：</font></td> </tr> </table> <pre><font face="verdana, arial" size="2">function simpleSwap(){ var the_image = prompt("change parrot or cheese",""); var the_image_name = "window.document." + the_image; var the_image_object = eval(the_image_name); the_image_object.src = "ant.gif";}</font><font face="verdana, arial" size="1"></font></pre> <div align="left"> <table width="448"> <tr> <td width="444"> <font face="helvetica, arial, sans-serif" size="3"></font><font size="3">从这里延伸一下，你也可以通过图象的名字在图象关联数组<br> 中引用图象，比如：<tt><font face="verdana, arial">window.document.images<br> ["parrot"].src</font></tt></font><font size="3" face="verdana, arial">. </font><font size="3">这就象通过数组的下标引用图象一样，如<br> <font face="verdana, arial"><tt>window.document.images[0].src</tt>. </font>所以，上面的代码可<br> 以重新写成：</font></td> </tr> </table> </div> <pre><font face="verdana, arial" size="2">function simpleSwap(){ var the_image = prompt("change parrot or cheese",""); window.document.images[the_image].src = "ant.gif";}</font></pre> <table width="444"> <tr> <td width="440"> <font face="helvetica, arial, sans-serif" size="3"></font><font size="3">你可以用这种技巧获得你的各种对象。如果在一个表单里有<br> 一个文本框，象这样： <blockquote> <pre> <font face="verdana, arial"></font><font face="verdana, arial"><form name="the_form"><input type="text" name="the_text_box"></form></font></pre> </blockquote> </font> <p><font size="3"> <font face="verdana, arial"></font>你可以用这个来改变文本框里的文本：</font></p> <p>window.document.forms["the_form"].elements["the_text_box"].value = "hello!";</p> <p><font size="3">现在你已经知道了好几种获取和改变对象信息的途径了。在<br> 上面的例子里，我们可以用四种手段来设置文本框的文本：</font> </td> </tr> </table> <blockquote> <pre><big></big>var the_form_name = "the_form";var the_element_name = "the_text_box";</pre> </blockquote> <ol> <li>window.document.forms[0].elements[0].value = "hello!"; </li> <li>window.document.forms[the_form_name].elements[the_element_name].value = "hello!"; </li> <li>window.document.the_form.the_text_box.value = "hello!"; </li> <li>var the_element_string = "window.document." + the_form_name + "." + the_element_name; var the_element = eval(the_element_string); the_element_string.value = "hello!"; </li> </ol> <table width="445"> <tr> <td width="441"><font size="3">具体到你用哪个方法也许取决于你的心情以及你能想起来用<br> 那一个。 <p><font face="verdana, arial"></font>这就是我们今天的课程，我们来复习一下。<a href="day4_11.html">>></a> </font></td> </tr> </table> <p align="left"><font face="宋体" size="3" color="#000000"><strong>JavaScript高级教程</strong></font><font color="#FF0000" face="宋体" size="3"><br> </font><font size="3"><font color="#FF3300">第一页</font> <a href="day4_1.html"><font face="verdana, arial, geneva, sans-serif">JavaScript</font>高级教程<font face="verdana, arial, geneva, sans-serif">- </font>第<font face="verdana, arial, geneva, sans-serif">4</font>天</a> <br> <font color="#FF3300">第二页 </font><a href="day4_2.html">图象映射与<font face="verdana, arial, geneva, sans-serif">JavaScript</font></a><font face="verdana, arial, geneva, sans-serif"><br> </font><font color="#FF3300">第三页 </font><a href="day4_3.html">预装图象 - 是什么<font face="verdana, arial, geneva, sans-serif">?</font></a><font face="verdana, arial, geneva, sans-serif"><br> </font><font color="#FF3300">第四页 </font><a href="day4_4.html">预装图象 - 怎么做?</a><font face="verdana, arial, geneva, sans-serif"><br> </font><font color="#FF3300">第五页 </font><a href="day4_5.html">对象的优点</a><br> <font color="#FF3300">第六页 </font><a href="day4_6.html">创建你自己的对象</a><br> <font color="#FF3300">第七页 </font><a href="day4_7.html">你的面向对象的虚拟宠物</a><br> <font color="#FF3300">第八页 </font><a href="day4_8.html">计算字符串</a><br> <font color="#FF3300">第九页 </font><a href="day4_9.html">获取难以索引的对象</a><br> <font color="#FF3300">第十页 </font>另一种获取难以索引的对象的手段<br> <font color="#FF3300">第十一页 </font><a href="day4_11.html">第四天课程复习</a></font></p> <p>[<a href="day1_1.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>]</p> <hr align="left"> <!--webbot bot="Include" U-Include="../../copyright.html" TAG="BODY" startspan --> <p><font face="verdana, arial, geneva, sans-serif" size="2"><a href="http://phtshop.yeah.net" target="_top">本文根据 网猴 相关文章改编，版权归原作者所有。</a> </font><font color="#000000"><span class="smallfont"></span></font></p> <!--webbot bot="Include" endspan i-checksum="15926" --> </td> </tr> <tr> </tr> </table></div></body></html>⌨️ 快捷键说明
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