幾個javascript例子.

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像下面的這樣的物件在對期進行付值時應該用innerHtml
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<textarea name="textfield"></textarea>
<span></span>
<div></div>
也就是沒有value屬性的標簽
if(frm.chk.checked){
  frm.textarea.innerHtml+=(frm.textarea.innerHtml=''?'':';')+frm.chk.value
}
===================幾個例子-====================
<script language="JavaScript">
<!--
function checkadd()
{
  var seled_wn=window.opener.document.<%=request("frm1")%>.value;
  var seled_misid=window.opener.document.<%=request("frm2")%>.value;
  for(var i=0;i<frm.elements.length;i++)
  {
    if(frm.elements[i].type=="checkbox")
    {
      if(frm.elements[i].checked)
      {
        if (seled_wn=='')
        {
          seled_wn=frm.elements[i].value;
        }
        else
        {
          seled_wn=seled_wn+";"+frm.elements[i].value;
        }
        if(seled_misid=='')
        {
          seled_misid=frm.elements[i].stylesid;
        }
        else
        {
          seled_misid=seled_misid+","+frm.elements[i].stylesid;
        }
      }
    }
  }
  frm.selected_wn.value="";
  frm.selected_mis_id.value="";
  window.opener.document.<%=request("frm1")%>.value=window.opener.document.<%=request("frm1")%>.value+seled_wn;
  window.opener.document.<%=request("frm2")%>.value=window.opener.document.<%=request("frm2")%>.value+seled_misid;

}

function returnVal()
{
   var workingno="";
   var allStylesid=",";
   for(i=1;i<<%=j-1%>;i++)
   {
      if(document.getElementById("chk_"+ i).checked)
      {
         if(workingno=="")
         {
            workingno=document.getElementById("chk_"+ i).value;
         }
         else
         {
            workingno=workingno +";"+ document.getElementById("chk_"+ i).value;
         }
         currMisid=document.getElementById("chk_"+ i).stylesid ;
         vtemp = ","+ currMisid +","
         if(allStylesid.indexOf(vtemp) == -1)
         {
            allStylesid = allStylesid + document.getElementById("chk_"+ i).stylesid +"," ;
         }
       }
    }
    allStylesid = allStylesid.substring(1,allStylesid.length-1);
    if (allStylesid==","){allStylesid="";}
    window.opener.document.<%=request("frm1")%>.value = workingno ;
    window.opener.document.<%=request("frm2")%>.value = allStylesid ;
    self.close();
}

function selall(flag)
{
  for(var i=0;i<frm.elements.length;i++)
  {
    if(frm.elements[i].type=="checkbox")
    {
      frm.elements[i].checked=flag;
    }
  }
}

function notsel()
{
  for(var i=0;i<frm.elements.length;i++)
  {
    if(frm.elements[i].type=="checkbox")
    {
      frm.elements[i].checked=!frm.elements[i].checked;
    }
  }
}
//-->
</script>