day4_5.html

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<title>Javascrip教程</title>
 <strong><font face="宋体" size="3">第五页：</font><font size="3">For循环</font></strong> 
      <p><font face="宋体" size="3">上例中while循环可以写成如下形式：</font>
      <ul>
        <pre><font face="宋体">
var a_line=&quot;&quot;;

var loop = 0;

while (loop &lt; width)

{

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

	loop=loop+1;

}

</font></pre>
      </ul>
      <p><font face="宋体" size="3">也可用For Loop写成：</font>
      <ul>
        <pre>
      <font size="2"></font><font size="3">
<font face="宋体">var a_line=&quot;&quot;;

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

{

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

}

</font></font></pre>
      </ul>
      <p> <font size="2"></font><font face="宋体" size="3">for循环的格式为：</font>
      <ul>
        <pre>
      <font size="2"></font><font size="3">

<font face="宋体">for (initial value; test; increment) 

{

	do this stuff;

}

</font></font></pre>
      </ul>
      <p align="JUSTIFY"> <font size="2"></font><font face="宋体" size="3">这样，上述for 
        loop设置loop=0并持续加1直到loop&lt;width，这<br>
        和上例中while loop相同，仅是少了数行而已。都表示<br>
        “在a_line上加width次x”。</font></p>
      <p align="JUSTIFY"><font size="3"> <font size="2"></font>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<br>
        有一个关于<a href="day4_6.html">嵌套循环</a>的例子。</font></p>
      <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">第一页</font><font size="2" face="宋体"> 
        </font><a href="day4_5.html"><font size="3">第四课介绍</font></a><font size="2"><br>
        </font><font size="3"><font color="#FF0000">第二页</font> <a href="day4_2.html">循环介绍</a></font><font size="2"><br>
        </font><font size="3"><font color="#FF0000">第三页</font> <a href="day4_3.html">循环的密码</a></font><font size="2"><br>
        </font><font size="3"><font color="#FF0000">第四页</font> <a href="day4_4.html">再谈<font face="宋体">WHILE</font>循环</a></font><font size="2"><br>
        </font><font size="3"><font color="#FF0000">第五页</font> For循环</font><font size="2"><br>
        </font><font size="3"><font color="#FF0000">第六页</font> <a href="day4_6.html">嵌套循环</a></font><font size="2"><br>
        </font><font size="3"><font color="#FF0000">第七页</font> <a href="day4_7.html">循环练习</a></font><font size="2"><br>
        </font><font size="3"><font color="#FF0000">第八页</font> <a href="day4_8.html">数组</a></font><font size="2"><br>
        </font><font size="3"><font color="#FF0000">第九页</font> <a href="day4_9.html">数组和循环</a></font><font size="2"><br>
        </font><font size="3"><font color="#FF0000">第十页</font> <a href="day4_10.html">文件目标模块中的数组</a></font><font size="2"><br>
        </font><font size="3"><font color="#FF0000">第十一页</font> <a href="day4_11.html">函数</a></font><font size="2"><br>
        </font><font size="3"><font color="#FF0000">第十二页</font> <a href="day4_12.html">无参数函数</a></font><font size="2"><br>
        </font><font size="3"><font color="#FF0000">第十三页</font> <a href="day4_13.html">参数及返回值</a></font><font size="2"><br>
        </font><font size="3"><font color="#FF0000">第十四页</font> <a href="day4_14.html">多于一个参数的函数</a></font></p>
      <p align="left"><font face="宋体" size="3">[<a href="index.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>]</font></p>
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