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<title>JavaScrip高级教程</title>
<strong>第三页:<font face="宋体" size="3">一个if-then-else的快捷方式</font></strong>
<p><font face="宋体">在JavaScript中最常用得语句就是if-then-else。下面是一<br>
个奖励猴子的例子:</font>
<ul>
<pre><font face="宋体">if (monkey_behavior == "good")
{
var toy = "videogames";
} else {
var toy = "rocks";
}
</font></pre>
</ul>
<p><font face="宋体">用通俗的英语翻译上面的代码意思是说:“如果猴子表现得<br>
好,就允许他玩电子游戏,否则就扁它。”上面的例子显示<br>
了if-then-else语句的标准格式,但是对于那些喜欢投机取<br>
巧的人,还有一种快捷方式:</font>
<ul>
<pre><font face="宋体">var toy = (monkey_behavior=="good") ? "videogames" : "rocks";
</font></pre>
</ul>
<p><font face="宋体">这个表达式和上面对语句所起的作用是完全一样的。这个条<br>
件语句有3部分:测试条件,测试为真时返回的值,以及测试<br>
为假时返回答值。在上面对例子中,测试条件是<br>
<tt>(monkey_behavior=="good")</tt>。如果测试条件为真,则返回字<br>
符串videogames;如果测试条件为假,则返回分号右边的值:<br>
rock。 </font></p>
<p><font face="宋体">这种快捷方式在函数调用中使用时非常便利。例如,你可以用<br>
它来做下面的事情:</font></p>
<p><font face="宋体">var password = "open sesame";<br>
<br>
var answer = prompt("what's the password? ","");<br>
<br>
alert((answer == password) ? "welcome!" : "buzz off");<br>
<br>
<a href="#" onClick="doAlert(); return false;">点击这里</a>你就可以看到代码执行的过程。根据你所输入的字符<br>
是否是规定单密码,你将受到“欢迎”的信息或者to是蜂鸣。 </font></p>
<p><font face="宋体">如果没有这种条件语句,则必须这样书写代码:: </font></p>
<blockquote>
<pre><font face="宋体">var password = "open sesame";
var answer = prompt("what's the password? ","");
if (answer == password)
{
alert("welcome");
} else {
alert("buzz off");
}
</font></pre>
</blockquote>
<p><font face="宋体">显然代码长了很多,但是也更容易了解它的含义。选用何种<br>
条件语句依每个人的喜好而定。<a href="day1_4.html">>></a></font></p>
<p><font face="宋体" size="3" color="#000000"><strong>JavaScript高级教程</strong></font><font color="#FF0000" face="宋体" size="3"><br>
</font><font face="宋体" size="3"><font color="#FF0000">第一页</font> <a href="day1_3.html">Javascript高级教程</a><br>
<font color="#FF0000">第二页</font> <a href="day1_2.html">本教程的课程计划</a><br>
<font color="#FF0000">第三页</font> 一个if-then-else的快捷方式<br>
<font color="#FF0000">第四页</font> <a href="day1_4.html">什么是变量</a><br>
<font color="#FF0000">第五页</font> <a href="day1_5.html">变量的使用方法</a></font><font size="2" face="宋体"><br>
</font></p>
<p><font size="3">[第1课][<a href="day2_1.html">第2课</a>][<a href="day3_1.html">第3课</a>][<a href="day4_1.html">第4课</a>][<a href="day5_1.html">第5课</a>]</font></p>
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