假设有这样一个表单：
<ol class="dp-xml"> <li class="alt"><span><span>＜form </span><span class="attribute"><font color="#ff0000">name</font></span><span>=</span><span class="attribute-value"><font color="#0000ff">"form1"</font></span><span> </span><span class="attribute"><font color="#ff0000">id</font></span><span>=</span><span class="attribute-value"><font color="#0000ff">"form1"</font></span><span> </span><span class="attribute"><font color="#ff0000">method</font></span><span>=</span><span class="attribute-value"><font color="#0000ff">"post"</font></span><span> </span><span class="attribute"><font color="#ff0000">action</font></span><span>=</span><span class="attribute-value"><font color="#0000ff">"myphp.php"</font></span><span> </span><span class="attribute"><font color="#ff0000">onSubmit</font></span><span>=</span><span class="attribute-value"><font color="#0000ff">"return Checker()"</font></span><span>＞ </span></span></li> <li class=""> <span>＜input </span><span class="attribute"><font color="#ff0000">type</font></span><span>=</span><span class="attribute-value"><font color="#0000ff">"checkbox"</font></span><span> </span><span class="attribute"><font color="#ff0000">name</font></span><span>=</span><span class="attribute-value"><font color="#0000ff">"item"</font></span><span> </span><span class="attribute"><font color="#ff0000">value</font></span><span>=</span><span class="attribute-value"><font color="#0000ff">"1"</font></span><span>＞1＜br＞ </span> </li> <li class="alt"> <span>＜input </span><span class="attribute"><font color="#ff0000">type</font></span><span>=</span><span class="attribute-value"><font color="#0000ff">"checkbox"</font></span><span> </span><span class="attribute"><font color="#ff0000">name</font></span><span>=</span><span class="attribute-value"><font color="#0000ff">"item"</font></span><span> </span><span class="attribute"><font color="#ff0000">value</font></span><span>=</span><span class="attribute-value"><font color="#0000ff">"2"</font></span><span>＞2＜br＞ </span> </li> <li class=""> <span>＜input </span><span class="attribute"><font color="#ff0000">type</font></span><span>=</span><span class="attribute-value"><font color="#0000ff">"checkbox"</font></span><span> </span><span class="attribute"><font color="#ff0000">name</font></span><span>=</span><span class="attribute-value"><font color="#0000ff">"item"</font></span><span> </span><span class="attribute"><font color="#ff0000">value</font></span><span>=</span><span class="attribute-value"><font color="#0000ff">"3"</font></span><span>＞3＜br＞ </span> </li> <li class="alt"> <span>＜input </span><span class="attribute"><font color="#ff0000">type</font></span><span>=</span><span class="attribute-value"><font color="#0000ff">"checkbox"</font></span><span> </span><span class="attribute"><font color="#ff0000">name</font></span><span>=</span><span class="attribute-value"><font color="#0000ff">"item"</font></span><span> </span><span class="attribute"><font color="#ff0000">value</font></span><span>=</span><span class="attribute-value"><font color="#0000ff">"4"</font></span><span>＞4＜br＞ </span> </li> <li class=""> <span>＜input </span><span class="attribute"><font color="#ff0000">type</font></span><span>=</span><span class="attribute-value"><font color="#0000ff">"hidden"</font></span><span> </span><span class="attribute"><font color="#ff0000">name</font></span><span>=</span><span class="attribute-value"><font color="#0000ff">"items"</font></span><span> </span><span class="attribute"><font color="#ff0000">value</font></span><span>=</span><span class="attribute-value"><font color="#0000ff">""</font></span><span>＞ </span> </li> <li class="alt"> <span>＜input </span><span class="attribute"><font color="#ff0000">type</font></span><span>=</span><span class="attribute-value"><font color="#0000ff">"submit"</font></span><span> </span><span class="attribute"><font color="#ff0000">value</font></span><span>=</span><span class="attribute-value"><font color="#0000ff">"Submit"</font></span><span>＞ </span> </li> <li class=""><span>＜/form＞ </span></li> </ol>
这个PHP接收复选框信息的例子中的表单有四个名字都是item的复选框，当用户单击Submit按钮的时候，Checker函数会被调用，并且如果Checker返回true表单就被提交，返回false表单就不会被提交。这里Checker函数就是我们要编写的预处理函数。在HTML的header部分添加下面的javascript：
<ol class="dp-xml">
<li class="alt"><span><span>＜script </span><span class="attribute"><font color="#ff0000">language</font></span><span>=</span><span class="attribute-value"><font color="#0000ff">"javascript"</font></span><span>＞ </span></span></li>
<li class=""><span>＜!-- </span></li>
<li class="alt"><span>function Checker() </span></li>
<li class=""><span>{ </span></li>
<li class="alt">
<span> </span><span class="attribute"><font color="#ff0000">form1.items.value</font></span><span> = </span><span class="attribute-value"><font color="#0000ff">""</font></span><span>; </span>
</li>
<li class="">
<span> if ( !form1.item.length ) // 只有一个复选框，</span><span class="attribute"><font color="#ff0000">form1.item.length</font></span><span> = </span><span class="attribute-value"><font color="#0000ff">undefined</font></span><span> </span>
</li>
<li class="alt"><span> { </span></li>
<li class=""><span>if ( form1.items.checked ) </span></li>
<li class="alt">
<span> </span><span class="attribute-value"><font color="#0000ff">form1</font></span><span class="attribute"><font color="#ff0000">form1.items.value</font></span><span> = form1.item.value; </span>
</li>
<li class=""><span> } </span></li>
<li class="alt"><span> else </span></li>
<li class=""><span> { </span></li>
<li class="alt">
<span>for ( </span><span class="attribute"><font color="#ff0000">i</font></span><span> = </span><span class="attribute-value"><font color="#0000ff">0</font></span><span> ; i ＜ form1.item.length ; i++ ) </span>
</li>
<li class=""><span>{ </span></li>
<li class="alt"><span> if ( form1.item(i).checked ) // 复选框中有选中的框 </span></li>
<li class=""><span> { </span></li>
<li class="alt">
<span></span><span class="attribute-value"><font color="#0000ff">form1</font></span><span class="attribute"><font color="#ff0000">form1.items.value</font></span><span> = form1.item(i).value; </span>
</li>
<li class="">
<span>for ( </span><span class="attribute"><font color="#ff0000">j</font></span><span> = </span><span class="attribute-value"><font color="#0000ff">i</font></span><span> + 1 ; j ＜ form1.item.length ; j++ ) </span>
</li>
<li class="alt"><span>{ </span></li>
<li class=""><span> if ( form1.item(j).checked ) </span></li>
<li class="alt"><span> { </span></li>
<li class=""><span>form1.items.value += " "; //用空格做分割符 </span></li>
<li class="alt"><span>form1.items.value += form1.item(j).value; </span></li>
<li class=""><span> } </span></li>
<li class="alt"><span>} </span></li>
<li class=""><span>break; </span></li>
<li class="alt"><span> } </span></li>
<li class=""><span>} </span></li>
<li class="alt"><span> } </span></li>
<li class=""><span> return true; </span></li>
<li class="alt"><span>} </span></li>
<li class=""><span>--＞ </span></li>
<li class="alt"><span>＜/script＞ </span></li>
</ol>这样就PHP接收复选框信息可以把所有选中的复选框的value组合成为一个字符串数组，在myphp.php使用这样的语句：
就可以把这些选项分离出来成为数组。需要注意的是选项中的value不能包含分割符（这里是空格）。
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