tutorial4_page13.htm

javascript从入门到精通； javascript从入门到精通

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    <td WIDTH="73%" VALIGN="MIDDLE" BGCOLOR="#ffffff"><font FACE="System,黑体" LANG="ZH-CN">假定时间链接被点击时，时间为</font><font
    FACE="宋体" LANG="ZH-CN">12:04:05</font><font FACE="System,黑体" LANG="ZH-CN">。用</font><tt>new 
    <br>
    Date()</tt><font FACE="System,黑体" LANG="ZH-CN">获得日期，用</font><tt>getHours()</tt><font
    FACE="System,黑体" LANG="ZH-CN">获得小时，用前面<br>
    所属方法获得分钟，分钟在本例中应该是</font><tt>4</tt><font FACE="宋体"
    LANG="ZH-CN">, </font><font FACE="System,黑体" LANG="ZH-CN">然后<br>
    调用</font><tt>fixNumber</tt><font FACE="System,黑体" LANG="ZH-CN">，其参数为</font><tt>the_minute</tt><font
    FACE="宋体" LANG="ZH-CN">: </font></td>
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var fixed_minute = fixNumber(the_minute);
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    <td WIDTH="73%" VALIGN="MIDDLE" BGCOLOR="#ffffff"><font FACE="System,黑体" LANG="ZH-CN">当</font><tt>fixNumber()</tt><font
    FACE="System,黑体" LANG="ZH-CN">被调用时，参数</font><tt>the_number</tt><font
    FACE="System,黑体" LANG="ZH-CN">被设置<br>
    为</font><tt>the_minute</tt><font FACE="System,黑体" LANG="ZH-CN">。在本例中由于</font><tt>the_minute</tt><font
    FACE="System,黑体" LANG="ZH-CN">是</font><font FACE="宋体" LANG="ZH-CN">4</font><font
    FACE="System,黑体" LANG="ZH-CN">，所<br>
    以</font><tt>the_number</tt><font FACE="System,黑体" LANG="ZH-CN">将被设置为</font><font
    FACE="宋体" LANG="ZH-CN">4</font><font FACE="System,黑体" LANG="ZH-CN">。设置完参数后，我们<br>
    进入函数主体。由于</font><font FACE="宋体" LANG="ZH-CN">4</font><font
    FACE="System,黑体" LANG="ZH-CN">小于</font><font FACE="宋体" LANG="ZH-CN">10</font><font
    FACE="System,黑体" LANG="ZH-CN">，</font><tt>the_number</tt><font FACE="System,黑体"
    LANG="ZH-CN">被改变<br>
    为</font><font FACE="宋体" LANG="ZH-CN">&quot;</font><tt>04</tt><font FACE="宋体"
    LANG="ZH-CN">&quot;</font><font FACE="System,黑体" LANG="ZH-CN">，然后</font><tt>the_number</tt><font
    FACE="System,黑体" LANG="ZH-CN">值用</font><font FACE="宋体" LANG="ZH-CN">return</font><font
    FACE="System,黑体" LANG="ZH-CN">指令返回。当</font><font FACE="宋体"
    LANG="ZH-CN"> </font><font FACE="System,黑体" LANG="ZH-CN"><br>
    </font><font FACE="宋体" LANG="ZH-CN">&quot;04&quot; </font><font FACE="System,黑体"
    LANG="ZH-CN">被</font><tt>fixNumber</tt><font FACE="System,黑体" LANG="ZH-CN">返回后，本例</font><tt>fixed_minute</tt><font
    FACE="宋体" LANG="ZH-CN"> </font><font FACE="System,黑体" LANG="ZH-CN">就<br>
    等于</font><font FACE="宋体" LANG="ZH-CN">&quot;04&quot;</font><font
    FACE="System,黑体" LANG="ZH-CN">。</font><font FACE="宋体" LANG="ZH-CN"> </font><font
    FACE="System,黑体" LANG="ZH-CN"><p>我们一步一步来研究该过程。假定时间为<br>
    </font><font FACE="宋体" LANG="ZH-CN">12:04:05</font><font FACE="System,黑体"
    LANG="ZH-CN">。<dir>
      <h2>我们从函数</font><tt>announceTime()<font FACE="System,黑体" LANG="ZH-CN">开始</h2>
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      </font>
      <li>the_minute</tt><font FACE="宋体" LANG="ZH-CN"> = </font><tt>the_date.getMinutes();</tt><font
        FACE="宋体" LANG="ZH-CN"><br>
        </font><font FACE="System,黑体" LANG="ZH-CN">则</font><tt>the_minute</tt><font
        FACE="宋体" LANG="ZH-CN"> = 4 </li>
      </font><tt>
      <li>fixed_minute = fixNumber(the_minute);</tt><font FACE="宋体" LANG="ZH-CN"><br>
        </font><font FACE="System,黑体" LANG="ZH-CN">等于<tt>函数</font><font FACE="宋体"
        LANG="ZH-CN">fixNumber()</font></tt><font FACE="System,黑体" LANG="ZH-CN">并将其值返回给<br>
        </font><tt>fixed_minute</tt><font FACE="宋体" LANG="ZH-CN"> </li>
      </font><font FACE="System,黑体" LANG="ZH-CN"><h2>现在进入函数</font><tt>fixNumber()</h2>
      <font FACE="System,黑体" LANG="ZH-CN">
      <li>函数</font><font FACE="宋体" LANG="ZH-CN">fixNumber(the_number)</font></tt><font
        FACE="System,黑体" LANG="ZH-CN"><br>
        </font><tt>fixNumber()</tt><font FACE="System,黑体" LANG="ZH-CN">用</font><tt>the_minute</tt><font
        FACE="System,黑体" LANG="ZH-CN">的值调用，<br>
        </font><font FACE="宋体" LANG="ZH-CN">the_minute</font><font FACE="System,黑体"
        LANG="ZH-CN">值是</font><font FACE="宋体" LANG="ZH-CN">4</font><font
        FACE="System,黑体" LANG="ZH-CN">，所以现在</font><tt>the_number = 4</tt><font
        FACE="宋体" LANG="ZH-CN"> </li>
      </font><tt><font FACE="System,黑体" LANG="ZH-CN">
      <li>如果</font><font FACE="宋体" LANG="ZH-CN">(the_number &lt; 10) {the_number = 
        &quot;0&quot; <br>
        + the_number;}</font></tt><font FACE="System,黑体" LANG="ZH-CN"><br>
        由于</font><font FACE="宋体" LANG="ZH-CN">4</font><font FACE="System,黑体"
        LANG="ZH-CN">小于</font><font FACE="宋体" LANG="ZH-CN">10</font><font
        FACE="System,黑体" LANG="ZH-CN">，所以</font><tt>the_number</tt><font
        FACE="System,黑体" LANG="ZH-CN">现在等于</font><font FACE="宋体" LANG="ZH-CN">&quot;04&quot; 
      </li>
      </font><font FACE="System,黑体" LANG="ZH-CN">
      <li>返回</font><tt>the_number</tt><font FACE="System,黑体" LANG="ZH-CN">值</font><font
        FACE="宋体" LANG="ZH-CN"> </font><font FACE="System,黑体" LANG="ZH-CN"><br>
        退出该函数并返回值</font><font FACE="宋体" LANG="ZH-CN">&quot;04&quot; </li>
      </font><tt><font FACE="System,黑体" LANG="ZH-CN"><h2>现在已经退出函数</font>fixTime()</tt><font
      FACE="System,黑体" LANG="ZH-CN">，所以现在我<br>
      们回到</font><tt>announceTime()</h2>
      </tt><font FACE="System,黑体" LANG="ZH-CN">
      <li>该函数返回值为</font><font FACE="宋体" LANG="ZH-CN">&quot;04&quot;</font><font
        FACE="System,黑体" LANG="ZH-CN">，所以</font><tt>fixed_minute</tt><font FACE="宋体"
        LANG="ZH-CN"> </font><font FACE="System,黑体" LANG="ZH-CN">现<br>
        在等于</font><font FACE="宋体" LANG="ZH-CN">&quot;04&quot; </li>
    </ol>
    <dir>
      <dir>
        </font><font FACE="System,黑体" LANG="ZH-CN"><p>该例用了一个只有一个参数的函数。实际上<br>
        你可以为函数设置多个参数。例如<a HREF="tppmsgs/msgs0.htm#98">该函数输<br>
        入两个数组并返回一个元素列表</a>。</font><font FACE="宋体" LANG="ZH-CN"> </font></p>
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    FACE="System,黑体" LANG="ZH-CN" SIZE="2"><br>
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    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>
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    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>
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    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>
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