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<title>JavaScrip教程</title>
<strong><font face="宋体" size="3">第二页：</font><font size="3">循环介绍</font></strong>
<p><font size="3">有时你想反复做同一件事。你想向某些人询问一个口令，你不<br>
断地问，直到得到正确的口令。如果你只想给他们两次尝试的<br>
机会，你可以这么做：</font>
<ul>
<pre><font size="3">
<font face="verdana, arial, geneva, sans-serif">var the_password = "pass the wrench";
var answer = prompt("What's the woyd?","");
if (answer != the_password) {
answer = prompt("What's the woyd?","");
if (password != the_password) {
document.write("You lose!<p>");
} else {
document.write("That's right!<p>");
}
} else {
document.write("That's right!<p>");
}
</font></font></pre>
</ul>
<p align="JUSTIFY"><font size="3" face="verdana, arial, geneva, sans-serif"></font><font size="3">不幸的是如果你想不住地问直到得到正确答案，上述做法是不<br>
起作用的。假使你是想询问四次而不是两次，那这已经是很讨<br>
厌的事了。你将使用四个层次的</font><font size="2" face="verdana, arial, geneva, sans-serif">if-then
</font><font size="3"><font size="2">子句，这决不是件好事。</font></font></p>
<font size="3">
<p align="JUSTIFY"> <font size="2" face="verdana, arial, geneva, sans-serif"></font>反复做相似的事情的最好方法是使用一个循环<font face="verdana, arial, geneva, sans-serif"><font face="Times New Roman">(loop</font>)</font>。在这种<br>
情况下，你可以用一个循环来不断的要求口令直到这个人说出<br>
为止。这里有一个<a href="day4_3.html"><font face="verdana, arial, geneva, sans-serif">while</font>循环工作的例子</a>，口令是：<font face="verdana, arial, geneva, sans-serif"><b>pass
the<br>
wrench</b></font>。</p>
</font>
<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_2.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> 循环介绍</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> <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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