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<td WIDTH="68%" VALIGN="MIDDLE"><font FACE="宋体" LANG="ZH-CN" SIZE="4" COLOR="#ff0000"></font><b><font
FACE="System,黑体" LANG="ZH-CN" SIZE="5" COLOR="#ff0000">第</font><font FACE="宋体"
LANG="ZH-CN" SIZE="5" COLOR="#ff0000">8</font><font FACE="System,黑体" LANG="ZH-CN"
SIZE="5" COLOR="#ff0000">页：单选框</font></b><font FACE="System,黑体" LANG="ZH-CN"><br>
<!-- BYLINE --> </font><font FACE="System,黑体" LANG="ZH-CN" SIZE="2">作者：</font><a
HREF="mailto:thau@wired.com"><font FACE="宋体" LANG="ZH-CN" SIZE="2">Thau!</font></a><font
FACE="宋体" LANG="ZH-CN"> <!-- SEE ALSO LINKS --></font></td>
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<td WIDTH="68%" VALIGN="MIDDLE" BGCOLOR="#ffffff"><font FACE="System,黑体" LANG="ZH-CN">在</font><font
FACE="宋体" LANG="ZH-CN">JavaScript</font><font FACE="System,黑体" LANG="ZH-CN">中单选框的用法和复选框是否相似。不同之处在于</font><font
FACE="宋体" LANG="ZH-CN">HTML</font><font FACE="System,黑体" LANG="ZH-CN">中的应用。复选框是一种开关。如果一个复选框被选中，你可以再点击后取消选取</font><font
FACE="宋体" LANG="ZH-CN">. </font><font FACE="System,黑体" LANG="ZH-CN">但如果单选框被选中，则只能通过选取另外一个单选框才能取消对该单选框的选取。例：<form>
<p><input TYPE="radio" CHECKED NAME="blah" VALUE="larry"> </font><font FACE="宋体"
LANG="ZH-CN">Larry<br>
<input TYPE="radio" NAME="blah" VALUE="moe"> Moe<br>
<input TYPE="radio" NAME="blah" VALUE="curly"> Curly</font></p>
</form>
<font FACE="System,黑体" LANG="ZH-CN"><p>在该例中，如果你打算取消对对一个单选框的选取，你必须集电极另一个单选框。用这种概念我们可以用两个单选框的设为代替一个复写纸的试着发式：</p>
<form>
</font><font FACE="System,黑体" LANG="ZH-CN" COLOR="#ff0000"><p><input TYPE="radio"
NAME="radio_1"> </font><font FACE="宋体" LANG="ZH-CN" COLOR="#ff0000">Light off<br>
<input TYPE="radio" CHECKED NAME="radio_2"> Light on</font></p>
</form>
<font FACE="System,黑体" LANG="ZH-CN"><p>表单编码如下：</font></td>
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<pre><big><form name="form_1">
<input type="radio" name ="radio_1" </big>
<big>onClick="offButton();">Light off
<input type="radio" name ="radio_2" </big>
<big>onClick="onButton();" checked>Light on
</form>
</big></pre>
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<td WIDTH="68%" VALIGN="MIDDLE" BGCOLOR="#ffffff"><font FACE="System,黑体" LANG="ZH-CN">当第一个单选框被选中时，<tt>函数</font>offButton()</tt><font
FACE="宋体" LANG="ZH-CN"> </font><font FACE="System,黑体" LANG="ZH-CN">被调用。函数如下：</font><font
FACE="宋体" LANG="ZH-CN"> </font></td>
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<pre><big>function offButton()
{
var the_box = </big>
<big>window.document.form_1.radio_1;
if (the_box.checked == true) </big>
<big>{
window.document.form_1.radio_2.checked = false;
document.bgColor='black';
alert("Hey! Turn that back on!");
}
}
</big></pre>
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<td WIDTH="68%" VALIGN="MIDDLE" BGCOLOR="#ffffff"><font FACE="System,黑体" LANG="ZH-CN">这个例子很象前面的复选框例子，主要的区别在于该行：</font><font
FACE="宋体" LANG="ZH-CN"> </font></td>
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<pre><big>window.document.form_1.radio_2.checked = false;
</big></pre>
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<td WIDTH="68%" VALIGN="MIDDLE" BGCOLOR="#ffffff"><font FACE="System,黑体" LANG="ZH-CN">该行指令指示</font><font
FACE="宋体" LANG="ZH-CN">JavaScript</font><font FACE="System,黑体" LANG="ZH-CN">在该按钮被点击时关闭另外一个按钮。由于另外一个按钮的函数同这个很相似：</font><font
FACE="宋体" LANG="ZH-CN"> </font></td>
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<pre><big>function onButton()
{
var the_box = window.document.form_1.radio_2;
if (the_box.checked == true) </big>
<big> {
window.document.form_1.radio_1.checked = false;
document.bgColor='white';
alert("Thanks!");
}
}
</big></pre>
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<font FACE="System,黑体" LANG="ZH-CN"><p>第</font><font FACE="宋体" LANG="ZH-CN">1</font><font
FACE="System,黑体" LANG="ZH-CN">页：<a HREF="tutorial5_page1.htm">第</font><font
FACE="宋体" LANG="ZH-CN">5</font><font FACE="System,黑体" LANG="ZH-CN">日课程介绍</a><br>
第</font><font FACE="宋体" LANG="ZH-CN">2</font><font FACE="System,黑体" LANG="ZH-CN">页：<a
HREF="tutorial5_page2.htm">介绍反馈表单</a><br>
第</font><font FACE="宋体" LANG="ZH-CN">3</font><font FACE="System,黑体" LANG="ZH-CN">页：<a
HREF="tutorial5_page3.htm">控制文字域的值</a><br>
第</font><font FACE="宋体" LANG="ZH-CN">4</font><font FACE="System,黑体" LANG="ZH-CN">页：<a
HREF="tutorial5_page4.htm">文字域事件</a><br>
第</font><font FACE="宋体" LANG="ZH-CN">5</font><font FACE="System,黑体" LANG="ZH-CN">页：<a
HREF="tutorial5_page5.htm">反馈表单处理器</a><br>
第</font><font FACE="宋体" LANG="ZH-CN">6</font><font FACE="System,黑体" LANG="ZH-CN">页：<a
HREF="tutorial5_page6.htm">文字域的练习</a><br>
第</font><font FACE="宋体" LANG="ZH-CN">7</font><font FACE="System,黑体" LANG="ZH-CN">页：<a
HREF="tutorial5_page7.htm">复选框</a><br>
第</font><font FACE="宋体" LANG="ZH-CN">8</font><font FACE="System,黑体" LANG="ZH-CN">页：<a
HREF="tutorial5_page8.htm">单选框</a><br>
第</font><font FACE="宋体" LANG="ZH-CN">9</font><font FACE="System,黑体" LANG="ZH-CN">页：<a
HREF="tutorial5_page9.htm">选单</a><br>
第</font><font FACE="宋体" LANG="ZH-CN">10</font><font FACE="System,黑体"
LANG="ZH-CN">页：<a HREF="tutorial5_page10.htm">在选单中应用</font><font
FACE="宋体" LANG="ZH-CN">onchange</font><font FACE="System,黑体" LANG="ZH-CN">命令</a><br>
</p>
</font><font FACE="System,黑体" LANG="ZH-CN" SIZE="2"><p> </p>
</font><font FACE="System,黑体" LANG="ZH-CN"><p><br>
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