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<title>Webmonkey: javascript: Thau's JavaScript Tutorial: Day 1</title>
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CONTENT="Thau's JavaScript Tutorial: Day 1: Not only does Thau give the JavaScript skinny, but he'll have you writing your first script by the end of the day.">
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<td WIDTH="68%" VALIGN="MIDDLE"><font FACE="宋體" LANG="ZH-CN" SIZE="4" COLOR="#ff0000"><!--Figure out which page title to display --></font><b><font
FACE="System,黑體" LANG="ZH-CN" COLOR="#ff0000">第</font><font FACE="宋體"
LANG="ZH-CN" COLOR="#ff0000">6</font><font FACE="System,黑體" LANG="ZH-CN"
COLOR="#ff0000">頁</font><font FACE="宋體" LANG="ZH-CN" COLOR="#ff0000">: if-then </font><font
FACE="System,黑體" LANG="ZH-CN" COLOR="#ff0000">子句</font></b><font
FACE="System,黑體" LANG="ZH-CN"><br>
<!-- BYLINE --> </font><font FACE="System,黑體" LANG="ZH-CN" SIZE="2">作者：</font><a
HREF="mailto:thau@wired.com"><font FACE="宋體" LANG="ZH-CN" SIZE="2">Thau!</font></a><font
FACE="宋體" LANG="ZH-CN"> <!-- SEE ALSO LINKS --></font></td>
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<td WIDTH="68%" VALIGN="TOP" BGCOLOR="#ffffff"><font FACE="宋體" LANG="ZH-CN" SIZE="2">"if-then"
</font><font FACE="System,黑體" LANG="ZH-CN" SIZE="2">子句的應用可以使得程序根據用戶輸入的值作出不同的反應。例如你可以寫一段程序使得它對你與對其他人反應不同。這里是它的基本格式：</font><pre>
if (some condition is true)
{
do something;
do something;
do something;
}
</pre>
<font FACE="System,黑體" LANG="ZH-CN" SIZE="2"><p>本結構的重要部分</font><font
FACE="宋體" LANG="ZH-CN" SIZE="2">:<ul>
</font><font FACE="System,黑體" LANG="ZH-CN" SIZE="2">
<li>以單詞</font><font FACE="宋體" LANG="ZH-CN" SIZE="2"> "</font><tt>if</tt><font
FACE="宋體" LANG="ZH-CN" SIZE="2">"</font><font FACE="System,黑體" LANG="ZH-CN"
SIZE="2">開始</font><font FACE="宋體" LANG="ZH-CN" SIZE="2"> (</font><tt>if</tt><font
FACE="宋體" LANG="ZH-CN" SIZE="2"> </font><font FACE="System,黑體" LANG="ZH-CN"
SIZE="2">必須小寫</font><font FACE="宋體" LANG="ZH-CN" SIZE="2">). </li>
</font><font FACE="System,黑體" LANG="ZH-CN" SIZE="2">
<li>圓括弧中是條件：非真即偽。</font> </li>
<font FACE="System,黑體" LANG="ZH-CN" SIZE="2">
<li>如果條件為真的話執行花括弧中的語句。</font> </li>
</ul>
<font FACE="System,黑體" LANG="ZH-CN" SIZE="2"><p>記住：空格是唯一保持程序可讀性的東西。當然你可以將整個</font><font
FACE="宋體" LANG="ZH-CN" SIZE="2">if-then</font><font FACE="System,黑體" LANG="ZH-CN"
SIZE="2">語句寫在一行中，但它讀起來就費勁了。</p>
<p>這里是一個</font><a HREF="tppmsgs/msgs0.htm#63"><font FACE="宋體" LANG="ZH-CN"
SIZE="2"> if-then </font><font FACE="System,黑體" LANG="ZH-CN" SIZE="2">子句的例子</font></a></p>
<font FACE="System,黑體" LANG="ZH-CN"><p>第</font><font FACE="宋體" LANG="ZH-CN">1</font><font
FACE="System,黑體" LANG="ZH-CN">頁：<a HREF="tutorial2.html">第二天課程簡介</a><br>
第</font><font FACE="宋體" LANG="ZH-CN">2</font><font FACE="System,黑體" LANG="ZH-CN">頁</font><font
FACE="宋體" LANG="ZH-CN">: </font><font FACE="System,黑體" LANG="ZH-CN"><a
HREF="tutorial2_page2.html">變量介紹</a><br>
第</font><font FACE="宋體" LANG="ZH-CN">3</font><font FACE="System,黑體" LANG="ZH-CN">頁</font><font
FACE="宋體" LANG="ZH-CN">:</font><font FACE="System,黑體" LANG="ZH-CN"><a
HREF="tutorial2_page3.html">首個變量例子的程序主體</a><br>
第</font><font FACE="宋體" LANG="ZH-CN">4</font><font FACE="System,黑體" LANG="ZH-CN">頁</font><font
FACE="宋體" LANG="ZH-CN">: </font><font FACE="System,黑體" LANG="ZH-CN"><a
HREF="tutorial2_page4.html">字符串的魔力</a><br>
第</font><font FACE="宋體" LANG="ZH-CN">5</font><font FACE="System,黑體" LANG="ZH-CN">頁</font><font
FACE="宋體" LANG="ZH-CN">: </font><font FACE="System,黑體" LANG="ZH-CN"><a
HREF="tutorial2_page5.html">變量練習</a><br>
第</font><font FACE="宋體" LANG="ZH-CN">6</font><font FACE="System,黑體" LANG="ZH-CN">頁</font><font
FACE="宋體" LANG="ZH-CN">: <a HREF="tutorial2_page6.html">if-then </font><font
FACE="System,黑體" LANG="ZH-CN">子句</a><br>
第</font><font FACE="宋體" LANG="ZH-CN">7</font><font FACE="System,黑體" LANG="ZH-CN">頁</font><font
FACE="宋體" LANG="ZH-CN">: <a HREF="tutorial2_page7.html">if-then </font><font
FACE="System,黑體" LANG="ZH-CN">語句的例子</a><br>
第</font><font FACE="宋體" LANG="ZH-CN">8</font><font FACE="System,黑體" LANG="ZH-CN">頁</font><font
FACE="宋體" LANG="ZH-CN">: <a HREF="tutorial2_page8.html">if-then </font><font
FACE="System,黑體" LANG="ZH-CN">練習</a><br>
第</font><font FACE="宋體" LANG="ZH-CN">9</font><font FACE="System,黑體" LANG="ZH-CN">頁</font><font
FACE="宋體" LANG="ZH-CN">: </font><font FACE="System,黑體" LANG="ZH-CN"><a
HREF="tutorial2_page9.html">鏈結事件</a><br>
第</font><font FACE="宋體" LANG="ZH-CN">10</font><font FACE="System,黑體"
LANG="ZH-CN">頁</font><font FACE="宋體" LANG="ZH-CN">: </font><font
FACE="System,黑體" LANG="ZH-CN"><a HREF="tutorial2_page10.html">圖片交換</a><br>
第</font><font FACE="宋體" LANG="ZH-CN">11</font><font FACE="System,黑體"
LANG="ZH-CN">頁</font><font FACE="宋體" LANG="ZH-CN">: </font><a
HREF="tutorial2_page11.html"><font FACE="System,黑體" LANG="ZH-CN">練習</font><font
FACE="宋體" LANG="ZH-CN"> 2</a><br>
</font><font FACE="System,黑體" LANG="ZH-CN">第</font><font FACE="宋體" LANG="ZH-CN">12</font><font
FACE="System,黑體" LANG="ZH-CN">頁</font><font FACE="宋體" LANG="ZH-CN">: </font><font
FACE="System,黑體" LANG="ZH-CN"><a HREF="tutorial2_page12.html">復習</a></font></td>
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