一个简单的javascript问题~~~~~~~急

Question

radiobutton是个集合，不能直接写document.form1.radiobutton.value 的

Answer 1

<form name="form1" method="post" action="">
  <input name="radiobutton" type="radio" value="1" checked>
  1  
  <input name="radiobutton" type="radio" value="2">
  2 
</form>
<form name="form2" method="post" action="">
   <a href="javascript:;" onClick="processForm()"><img src="1.jpg" width="90" height="90" border="0"></a> 
</form>
<script language="JavaScript" type="text/JavaScript">
<!--
function processForm(){  
for(i=0;i<document.getElementsByName("radiobutton").length;i++)
{
if(document.getElementsByName("radiobutton")[i].checked)
{
if(document.getElementsByName("radiobutton")[i].value=="1")
window.open('http://www.sina.com.cn','parent');
else
window.open('http://xml.sz.luohuedu.net/xml/Content.asp','parent');
}
}
}
//-->
</script>

Answer 2

<script language="JavaScript" type="text/JavaScript">
<!--
function processForm(){  
  for(i=0;i<document.form1.radiobutton.length;i++){
    if(document.form1.radiobutton[i].checked){
     if (document.form1.radiobutton[i].value =="1"){ alert("1");
      "goToURL('parent','http://www.sina.com.cn');return         document.returnValue";   
     }
     else{ alert("2");
       "goToURL('parent','http://www.163.com'); return  document.returnValue";
  
     }
    }
  }
}
//-->
</script>

Answer 3

<script language="JavaScript" type="text/JavaScript">
<!--
function goToURL() { //v3.0
  var i, args=goToURL.arguments; document.returnValue = false;
  for (i=0; i<(args.length-1); i+=2) eval(args[i]+".location='"+args[i+1]+"'");
}
//--></script><script language="JavaScript" type="text/JavaScript">
<!--
function processForm(){  
   var a=document.getElementsByName("radiobutton")
   
   
      if(a[0].checked)
      {
         goToURL('parent','http://www.sina.com.cn');
         return document.returnValue;  
       }
      else if(a[1].checked)
      { 
        goToURL('parent','http://www.163.com');
        return document.returnValue;
       }}
//-->
</script>
<form name="form1" method="post" action="">
  <input name="radiobutton" type="radio" value="1" checked>
  1  
  <input name="radiobutton" type="radio" value="2">
  2 
</form>
<form name="form2" method="post" action="">
   <a href="#" onClick="processForm()"><img src="1.jpg" width="90" height="90" border="0"></a> 
</form>