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📄 tutorial4_page5.htm

📁 一本很好的java script 教程
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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="58%" VALIGN="MIDDLE"><font FACE="宋体" LANG="ZH-CN" SIZE="4" COLOR="#ff0000"></font><font
    FACE="System,黑体" LANG="ZH-CN" COLOR="#ff0000"><b>第5页：For Loops</b></font><font
    FACE="宋体" LANG="ZH-CN"><br>
<!-- BYLINE -->    </font><font FACE="System,黑体" LANG="ZH-CN" SIZE="2">作者：</font><a
    HREF="mailto:thau@wired.com"><font FACE="宋体" LANG="ZH-CN" SIZE="2">Thau!</font></a><font
    FACE="宋体" LANG="ZH-CN"> <!-- SEE ALSO LINKS --></font></td>
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  <tr>
    <td WIDTH="58%" VALIGN="TOP" BGCOLOR="#ffffff"><font FACE="System,黑体" LANG="ZH-CN">上例中</font><font
    FACE="宋体" LANG="ZH-CN">while</font><font FACE="System,黑体" LANG="ZH-CN">循环可以写成如下形式：</font><pre>

var a_line=&quot;&quot;;

var loop = 0;

while (loop &lt; width)

{

	a_line = a_line + &quot;x&quot;;

	loop=loop+1;

}
</pre>
    <font FACE="System,黑体" LANG="ZH-CN"><p>也可用</font><font FACE="宋体"
    LANG="ZH-CN">For Loop</font><font FACE="System,黑体" LANG="ZH-CN">写成：</p>
    <pre>

</font>var a_line=&quot;&quot;;

for (loop=0; loop &lt; width; loop++)

{

	a_line = a_line + &quot;x&quot;;

}
</pre>
    <font FACE="宋体" LANG="ZH-CN"><p>for</font><font FACE="System,黑体" LANG="ZH-CN">循环的格式为：</p>
    <pre>

</font>for (initial value; test; increment) 

{

	do this stuff;

}
</pre>
    <font FACE="System,黑体" LANG="ZH-CN"><p ALIGN="JUSTIFY">这样，上述</font><font
    FACE="宋体" LANG="ZH-CN">for loop</font><font FACE="System,黑体" LANG="ZH-CN">设置</font><font
    FACE="宋体" LANG="ZH-CN">loop=0</font><font FACE="System,黑体" LANG="ZH-CN">并持续加</font><font
    FACE="宋体" LANG="ZH-CN">1</font><font FACE="System,黑体" LANG="ZH-CN">直到</font><font
    FACE="宋体" LANG="ZH-CN">loop&lt;width</font><font FACE="System,黑体" LANG="ZH-CN">，这和上例中</font><font
    FACE="宋体" LANG="ZH-CN">while loop</font><font FACE="System,黑体" LANG="ZH-CN">相同，仅是少了数行而已。都表示“在</font><font
    FACE="宋体" LANG="ZH-CN">a_line</font><font FACE="System,黑体" LANG="ZH-CN">上加</font><font
    FACE="宋体" LANG="ZH-CN">width</font><font FACE="System,黑体" LANG="ZH-CN">次</font><font
    FACE="宋体" LANG="ZH-CN">x</font><font FACE="System,黑体" LANG="ZH-CN">”。</p>
    <p ALIGN="JUSTIFY">在我们练习使用循环之前应明白一件事：循环可以嵌套。这里有一个关于<a
    HREF="tutorial4_page6.htm">嵌套循环</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="宋体" LANG="ZH-CN">1</font><font FACE="System,黑体"
    LANG="ZH-CN">页</font><font FACE="宋体" LANG="ZH-CN" SIZE="2">: </font><a
    HREF="tutorial4.htm"><font FACE="System,黑体" LANG="ZH-CN">第四课介绍</font></a><font
    FACE="System,黑体" 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,黑体" LANG="ZH-CN">第</font><font FACE="宋体" LANG="ZH-CN">2</font><font
    FACE="System,黑体" LANG="ZH-CN">页</font><font FACE="宋体" LANG="ZH-CN" SIZE="2">: </font><a
    HREF="tutorial4_page2.htm"><font FACE="System,黑体" LANG="ZH-CN">循环介绍</font></a><font
    FACE="System,黑体" 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,黑体" LANG="ZH-CN">第</font><font FACE="宋体" LANG="ZH-CN">3</font><font
    FACE="System,黑体" LANG="ZH-CN">页</font><font FACE="宋体" LANG="ZH-CN" SIZE="2">: </font><a
    HREF="tutorial4_page3.htm"><font FACE="System,黑体" LANG="ZH-CN">循环的密码</font></a><font
    FACE="System,黑体" 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,黑体" LANG="ZH-CN">第</font><font FACE="宋体" LANG="ZH-CN">4</font><font
    FACE="System,黑体" LANG="ZH-CN">页</font><font FACE="宋体" LANG="ZH-CN" SIZE="2">: </font><a
    HREF="tutorial4_page4.htm"><font FACE="System,黑体" LANG="ZH-CN">再谈</font><font
    FACE="宋体" LANG="ZH-CN">WHILE</font><font FACE="System,黑体" LANG="ZH-CN">循环</font></a><font
    FACE="System,黑体" 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,黑体" LANG="ZH-CN">第</font><font FACE="宋体" LANG="ZH-CN">5</font><font
    FACE="System,黑体" LANG="ZH-CN">页</font><font FACE="宋体" LANG="ZH-CN" SIZE="2">: </font><a
    HREF="tutorial4_page5.htm"><font FACE="宋体" LANG="ZH-CN">For </font><font
    FACE="System,黑体" LANG="ZH-CN">循环</font></a><font FACE="System,黑体" 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,黑体" LANG="ZH-CN">第</font><font FACE="宋体" LANG="ZH-CN">6</font><font
    FACE="System,黑体" LANG="ZH-CN">页</font><font FACE="宋体" LANG="ZH-CN" SIZE="2">: </font><a
    HREF="tutorial4_page6.htm"><font FACE="System,黑体" LANG="ZH-CN">嵌套循环</font></a><font
    FACE="System,黑体" 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,黑体" LANG="ZH-CN">第</font><font FACE="宋体" LANG="ZH-CN">7</font><font
    FACE="System,黑体" LANG="ZH-CN">页</font><font FACE="宋体" LANG="ZH-CN" SIZE="2">: </font><a
    HREF="tutorial4_page7.htm"><font FACE="System,黑体" LANG="ZH-CN">循环练习</font></a><font
    FACE="System,黑体" 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,黑体" LANG="ZH-CN">第</font><font FACE="宋体" LANG="ZH-CN">8</font><font
    FACE="System,黑体" LANG="ZH-CN">页</font><font FACE="宋体" LANG="ZH-CN" SIZE="2">: </font><a
    HREF="tutorial4_page8.htm"><font FACE="System,黑体" LANG="ZH-CN">数组</font></a><font
    FACE="System,黑体" 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,黑体" LANG="ZH-CN">第</font><font FACE="宋体" LANG="ZH-CN">9</font><font
    FACE="System,黑体" LANG="ZH-CN">页</font><font FACE="宋体" LANG="ZH-CN" SIZE="2">: </font><a
    HREF="tutorial4_page9.htm"><font FACE="System,黑体" LANG="ZH-CN">数组和循环</font></a><font
    FACE="System,黑体" 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,黑体" LANG="ZH-CN">第</font><font FACE="宋体" LANG="ZH-CN">10</font><font
    FACE="System,黑体" LANG="ZH-CN">页</font><font FACE="宋体" LANG="ZH-CN" SIZE="2">:</font><a
    HREF="tutorial4_page10.html"><font FACE="System,黑体" LANG="ZH-CN">文件目标模块中的数组</font></a><font
    FACE="System,黑体" 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,黑体" LANG="ZH-CN">第</font><font FACE="宋体" LANG="ZH-CN">11</font><font
    FACE="System,黑体" LANG="ZH-CN">页</font><font FACE="宋体" LANG="ZH-CN" SIZE="2">: </font><a
    HREF="tutorial4_page11.htm"><font FACE="System,黑体" LANG="ZH-CN">函数</font></a><font
    FACE="System,黑体" 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,黑体" LANG="ZH-CN">第</font><font FACE="宋体" LANG="ZH-CN">12</font><font
    FACE="System,黑体" LANG="ZH-CN">页</font><font FACE="宋体" LANG="ZH-CN" SIZE="2">: </font><a
    HREF="tutorial4_page12.html"><font FACE="System,黑体" LANG="ZH-CN">无参数函数</font></a><font
    FACE="System,黑体" 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,黑体" LANG="ZH-CN">第</font><font FACE="宋体" LANG="ZH-CN">13</font><font
    FACE="System,黑体" LANG="ZH-CN">页</font><font FACE="宋体" LANG="ZH-CN" SIZE="2">: </font><a
    HREF="tutorial4_page13.htm"><font FACE="System,黑体" LANG="ZH-CN">参数及返回值</font></a><font
    FACE="System,黑体" 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,黑体" LANG="ZH-CN">第</font><font FACE="宋体" LANG="ZH-CN">14</font><font
    FACE="System,黑体" LANG="ZH-CN">页</font><font FACE="宋体" LANG="ZH-CN" SIZE="2">: </font><a
    HREF="tutorial4_page14.htm"><font FACE="System,黑体" LANG="ZH-CN">多于一个参数的函数</font></a><font
    FACE="System,黑体" 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="宋体" LANG="ZH-CN" SIZE="2"></p>
    <p><br>
<!-- AUTHOR TAGLINE -->    </font></td>
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