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<title>JavaScrip教程</title>
<strong><font face="宋体" size="3">第六页：</font><font size="3">嵌套循环</font></strong>
<p><font face="宋体" size="3">这是程序：</font></p>
<p><font face="宋体"><br>
var height = prompt("How high do you <br>
want the grid? (1-10 is good)","10");<br>
<br>
var width= prompt("How wide do you want <br>
the grid? (1-10 is good)","10");<br>
<br>
var a_line;<br>
<br>
var new_window = <br>
window.open("/webmonkey/98/04/files1a<br>
/grid.html","looper","width=400,height=400");<br>
<br>
new_window.document.writeln("<h1>A Grid</h1>");<br>
<br>
for (height_loop = 0; height_loop <br>
< height; height_loop++) <br>
<br>
{ <br>
<br>
a_line = "";<br>
<br>
for (width_loop = 0; <br>
width_loop < width; width_loop++)<br>
<br>
{<br>
<br>
a_line+="x";<br>
<br>
}<br>
<br>
new_window.document.writeln<br>
(a_line + "<br>");<br>
<br>
}<br>
</font></p>
<p align="JUSTIFY"><font face="宋体" size="3">在请求高及宽后，打开一新窗口，并为它写一个头，进入for<br>
循环。第一个for循环设a_line=“”。试一下不用该行做一下<br>
本例，看看会发生什么。在初始化a_line后，程序进入下一个<br>
for循环，当宽达到所需值后，建立X`S行并将它显现在新窗<br>
口中。这些将发生height次。</font></p>
<p align="JUSTIFY"> <font size="2"></font><font face="宋体" size="3">好，现在你的任务：看一下这个<a href="day4_7.html">循环练习</a>并亲自试着在看源码<br>
前写一个。</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_6.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> <a href="day4_5.html">For循环</a></font><font size="2"><br>
</font><font size="3"><font color="#FF0000">第六页</font> 嵌套循环</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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