代碼如下：
<html><br /><head><br /><meta http-equiv="Content-Type" content="text/html; charset=gb2312"><br /><script language="JavaScript"><br />function howmany(){<br />var fm;<br />fm=document.form1;<br /> for(i = 0; i < fm.rd.length; i++){<br /> if(fm.rd[i].checked==true){<br /> for(j=0; j<=i;j++){<br /> document.all.newanew.insertAdjacentHTML("AfterBegin","<input type='file' name='myfile"+i+"'> <br>");<br /> }<br /> }<br /> fm.rd[i].disabled=true;<br /> }<br />}<br /></script><br /></head><br /><body><br /><form name="form1" method="post" action=""><br /> <input type="radio" name="rd" value="1" onClick="howmany()" ><br /> 1<br /> <input type="radio" name="rd" value="2" onClick="howmany()" ><br /> 2<br /> <input type="radio" name="rd" value="3" onClick="howmany()" ><br /> 3<br /> <input type="radio" name="rd" value="4" onClick="howmany()" ><br /> 4<br /><p id="newanew"> </p><br /></form></body><br /></html>
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