What are the ways to get the value of javascript variable in html

<scriptlanguage="javascript"type="text/javascript">
   var df=newDate(); 
   var year= df.getFullYear() ;
   document.write("<td>"+year+" J2EE开发</td>");
</script>

$(function(){
      vardf=newDate();
      varyear=df.getFullYear()
      $("#td1").text(year+" J2EE开发");
   });

<td id="td1"></td>

<%
   java.text.SimpleDateFormatdf = new java.text.SimpleDateFormat("yyyy");
   Stringyear = df.format(new java.util.Date());
 %>
 
<td align="center"><%=year%> J2EE开发</font></td></tr>