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<td WIDTH="58%" VALIGN="MIDDLE"><font FACE="宋體" LANG="ZH-CN" SIZE="4" COLOR="#ff0000"></font><font
FACE="System,黑體" LANG="ZH-CN" COLOR="#ff0000"><b>第5頁(yè)：For Loops</b></font><font
FACE="宋體" 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="58%" VALIGN="TOP" BGCOLOR="#ffffff"><font FACE="System,黑體" LANG="ZH-CN">上例中</font><font
FACE="宋體" LANG="ZH-CN">while</font><font FACE="System,黑體" LANG="ZH-CN">循環(huán)可以寫成如下形式：</font><pre>
var a_line="";
var loop = 0;
while (loop < width)
{
a_line = a_line + "x";
loop=loop+1;
}
</pre>
<font FACE="System,黑體" LANG="ZH-CN"><p>也可用</font><font FACE="宋體"
LANG="ZH-CN">For Loop</font><font FACE="System,黑體" LANG="ZH-CN">寫成：</p>
<pre>
</font>var a_line="";
for (loop=0; loop < width; loop++)
{
a_line = a_line + "x";
}
</pre>
<font FACE="宋體" LANG="ZH-CN"><p>for</font><font FACE="System,黑體" LANG="ZH-CN">循環(huán)的格式為：</p>
<pre>
</font>for (initial value; test; increment)
{
do this stuff;
}
</pre>
<font FACE="System,黑體" LANG="ZH-CN"><p ALIGN="JUSTIFY">這樣，上述</font><font
FACE="宋體" LANG="ZH-CN">for loop</font><font FACE="System,黑體" LANG="ZH-CN">設(shè)置</font><font
FACE="宋體" LANG="ZH-CN">loop=0</font><font FACE="System,黑體" LANG="ZH-CN">并持續(xù)加</font><font
FACE="宋體" LANG="ZH-CN">1</font><font FACE="System,黑體" LANG="ZH-CN">直到</font><font
FACE="宋體" LANG="ZH-CN">loop<width</font><font FACE="System,黑體" LANG="ZH-CN">，這和上例中</font><font
FACE="宋體" LANG="ZH-CN">while loop</font><font FACE="System,黑體" LANG="ZH-CN">相同，僅是少了數(shù)行而已。都表示“在</font><font
FACE="宋體" LANG="ZH-CN">a_line</font><font FACE="System,黑體" LANG="ZH-CN">上加</font><font
FACE="宋體" LANG="ZH-CN">width</font><font FACE="System,黑體" LANG="ZH-CN">次</font><font
FACE="宋體" LANG="ZH-CN">x</font><font FACE="System,黑體" LANG="ZH-CN">”。</p>
<p ALIGN="JUSTIFY">在我們練習(xí)使用循環(huán)之前應(yīng)明白一件事：循環(huán)可以嵌套。這里有一個(gè)關(guān)于<a
HREF="tutorial4_page6.htm">嵌套循環(huán)</a>的例子。</p>
<p><!-- PAGE X LINKS --><!-- this stuff checks if there are more pages in this story. if so, we'll
suck out the titles of those pages and build links. Right now, the maximum is
15 pages. -->第</font><font FACE="宋體" LANG="ZH-CN">1</font><font FACE="System,黑體"
LANG="ZH-CN">頁(yè)</font><font FACE="宋體" LANG="ZH-CN" SIZE="2">: </font><a
HREF="tutorial4.htm"><font FACE="System,黑體" LANG="ZH-CN">第四課介紹</font></a><font
FACE="System,黑體" LANG="ZH-CN" SIZE="2"><br>
<!-- PAGE X LINKS --><!-- this stuff checks if there are more pages in this story. if so, we'll
suck out the titles of those pages and build links. Right now, the maximum is 15 pages. --><!-- this is a mini-template that formats each pageX link. So, if a story
has 15 pages, we need to generate 15 links to it. This is how each one
will look... --> </font><font FACE="System,黑體" LANG="ZH-CN">第</font><font FACE="宋體" LANG="ZH-CN">2</font><font
FACE="System,黑體" LANG="ZH-CN">頁(yè)</font><font FACE="宋體" LANG="ZH-CN" SIZE="2">: </font><a
HREF="tutorial4_page2.htm"><font FACE="System,黑體" LANG="ZH-CN">循環(huán)介紹</font></a><font
FACE="System,黑體" LANG="ZH-CN" SIZE="2"><br>
<!-- this is a mini-template that formats each pageX link. So, if a story
has 15 pages, we need to generate 15 links to it. This is how each one
will look... --> </font><font FACE="System,黑體" LANG="ZH-CN">第</font><font FACE="宋體" LANG="ZH-CN">3</font><font
FACE="System,黑體" LANG="ZH-CN">頁(yè)</font><font FACE="宋體" LANG="ZH-CN" SIZE="2">: </font><a
HREF="tutorial4_page3.htm"><font FACE="System,黑體" LANG="ZH-CN">循環(huán)的密碼</font></a><font
FACE="System,黑體" LANG="ZH-CN" SIZE="2"><br>
<!-- this is a mini-template that formats each pageX link. So, if a story
has 15 pages, we need to generate 15 links to it. This is how each one
will look... --> </font><font FACE="System,黑體" LANG="ZH-CN">第</font><font FACE="宋體" LANG="ZH-CN">4</font><font
FACE="System,黑體" LANG="ZH-CN">頁(yè)</font><font FACE="宋體" LANG="ZH-CN" SIZE="2">: </font><a
HREF="tutorial4_page4.htm"><font FACE="System,黑體" LANG="ZH-CN">再談</font><font
FACE="宋體" LANG="ZH-CN">WHILE</font><font FACE="System,黑體" LANG="ZH-CN">循環(huán)</font></a><font
FACE="System,黑體" LANG="ZH-CN" SIZE="2"><br>
<!-- this is a mini-template that formats each pageX link. So, if a story
has 15 pages, we need to generate 15 links to it. This is how each one
will look... --> </font><font FACE="System,黑體" LANG="ZH-CN">第</font><font FACE="宋體" LANG="ZH-CN">5</font><font
FACE="System,黑體" LANG="ZH-CN">頁(yè)</font><font FACE="宋體" LANG="ZH-CN" SIZE="2">: </font><a
HREF="tutorial4_page5.htm"><font FACE="宋體" LANG="ZH-CN">For </font><font
FACE="System,黑體" LANG="ZH-CN">循環(huán)</font></a><font FACE="System,黑體" LANG="ZH-CN"
SIZE="2"><br>
<!-- this is a mini-template that formats each pageX link. So, if a story
has 15 pages, we need to generate 15 links to it. This is how each one
will look... --> </font><font FACE="System,黑體" LANG="ZH-CN">第</font><font FACE="宋體" LANG="ZH-CN">6</font><font
FACE="System,黑體" LANG="ZH-CN">頁(yè)</font><font FACE="宋體" LANG="ZH-CN" SIZE="2">: </font><a
HREF="tutorial4_page6.htm"><font FACE="System,黑體" LANG="ZH-CN">嵌套循環(huán)</font></a><font
FACE="System,黑體" LANG="ZH-CN" SIZE="2"><br>
<!-- this is a mini-template that formats each pageX link. So, if a story
has 15 pages, we need to generate 15 links to it. This is how each one
will look... --> </font><font FACE="System,黑體" LANG="ZH-CN">第</font><font FACE="宋體" LANG="ZH-CN">7</font><font
FACE="System,黑體" LANG="ZH-CN">頁(yè)</font><font FACE="宋體" LANG="ZH-CN" SIZE="2">: </font><a
HREF="tutorial4_page7.htm"><font FACE="System,黑體" LANG="ZH-CN">循環(huán)練習(xí)</font></a><font
FACE="System,黑體" LANG="ZH-CN" SIZE="2"><br>
<!-- this is a mini-template that formats each pageX link. So, if a story
has 15 pages, we need to generate 15 links to it. This is how each one
will look... --> </font><font FACE="System,黑體" LANG="ZH-CN">第</font><font FACE="宋體" LANG="ZH-CN">8</font><font
FACE="System,黑體" LANG="ZH-CN">頁(yè)</font><font FACE="宋體" LANG="ZH-CN" SIZE="2">: </font><a
HREF="tutorial4_page8.htm"><font FACE="System,黑體" LANG="ZH-CN">數(shù)組</font></a><font
FACE="System,黑體" LANG="ZH-CN" SIZE="2"><br>
<!-- this is a mini-template that formats each pageX link. So, if a story
has 15 pages, we need to generate 15 links to it. This is how each one
will look... --> </font><font FACE="System,黑體" LANG="ZH-CN">第</font><font FACE="宋體" LANG="ZH-CN">9</font><font
FACE="System,黑體" LANG="ZH-CN">頁(yè)</font><font FACE="宋體" LANG="ZH-CN" SIZE="2">: </font><a
HREF="tutorial4_page9.htm"><font FACE="System,黑體" LANG="ZH-CN">數(shù)組和循環(huán)</font></a><font
FACE="System,黑體" LANG="ZH-CN" SIZE="2"><br>
<!-- this is a mini-template that formats each pageX link. So, if a story
has 15 pages, we need to generate 15 links to it. This is how each one
will look... --> </font><font FACE="System,黑體" LANG="ZH-CN">第</font><font FACE="宋體" LANG="ZH-CN">10</font><font
FACE="System,黑體" LANG="ZH-CN">頁(yè)</font><font FACE="宋體" LANG="ZH-CN" SIZE="2">:</font><a
HREF="tutorial4_page10.html"><font FACE="System,黑體" LANG="ZH-CN">文件目標(biāo)模塊中的數(shù)組</font></a><font
FACE="System,黑體" LANG="ZH-CN" SIZE="2"><br>
<!-- this is a mini-template that formats each pageX link. So, if a story
has 15 pages, we need to generate 15 links to it. This is how each one
will look... --> </font><font FACE="System,黑體" LANG="ZH-CN">第</font><font FACE="宋體" LANG="ZH-CN">11</font><font
FACE="System,黑體" LANG="ZH-CN">頁(yè)</font><font FACE="宋體" LANG="ZH-CN" SIZE="2">: </font><a
HREF="tutorial4_page11.htm"><font FACE="System,黑體" LANG="ZH-CN">函數(shù)</font></a><font
FACE="System,黑體" LANG="ZH-CN" SIZE="2"><br>
<!-- this is a mini-template that formats each pageX link. So, if a story
has 15 pages, we need to generate 15 links to it. This is how each one
will look... --> </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(yè)</font><font FACE="宋體" LANG="ZH-CN" SIZE="2">: </font><a
HREF="tutorial4_page12.html"><font FACE="System,黑體" LANG="ZH-CN">無(wú)參數(shù)函數(shù)</font></a><font
FACE="System,黑體" LANG="ZH-CN" SIZE="2"><br>
<!-- this is a mini-template that formats each pageX link. So, if a story
has 15 pages, we need to generate 15 links to it. This is how each one
will look... --> </font><font FACE="System,黑體" LANG="ZH-CN">第</font><font FACE="宋體" LANG="ZH-CN">13</font><font
FACE="System,黑體" LANG="ZH-CN">頁(yè)</font><font FACE="宋體" LANG="ZH-CN" SIZE="2">: </font><a
HREF="tutorial4_page13.htm"><font FACE="System,黑體" LANG="ZH-CN">參數(shù)及返回值</font></a><font
FACE="System,黑體" LANG="ZH-CN" SIZE="2"><br>
<!-- this is a mini-template that formats each pageX link. So, if a story
has 15 pages, we need to generate 15 links to it. This is how each one
will look... --> </font><font FACE="System,黑體" LANG="ZH-CN">第</font><font FACE="宋體" LANG="ZH-CN">14</font><font
FACE="System,黑體" LANG="ZH-CN">頁(yè)</font><font FACE="宋體" LANG="ZH-CN" SIZE="2">: </font><a
HREF="tutorial4_page14.htm"><font FACE="System,黑體" LANG="ZH-CN">多于一個(gè)參數(shù)的函數(shù)</font></a><font
FACE="System,黑體" LANG="ZH-CN" SIZE="2"><br>
<!-- this is a mini-template that formats each pageX link. So, if a story
has 15 pages, we need to generate 15 links to it. This is how each one
will look... --> </font><font FACE="宋體" LANG="ZH-CN" SIZE="2"></p>
<p><br>
<!-- AUTHOR TAGLINE --> </font></td>
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