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tab 的简单实现原理

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML>
 <HEAD>
  <TITLE> New Document </TITLE>
 </HEAD>
 <BODY>
 <input type="button" value="div1" id="tab1" οnclick="changeDiv(this)" />
 <input type="button" value="div2" id="tab2" οnclick="changeDiv(this)" />
 <table>
  <tr>
   <td>
    <div id="div_tab1" style="border: 1px solid #0099CC;">
     </br>
     tab1 is chosed
     </br>
    </div>
    <div id="div_tab2" style="display:none;border: 1px solid #0099CC;">
     </br>
     tab2 is chosed
     </br>
    </div>
   </td>
  </tr>
 </table> </BODY>
 <script language="javascript">
 function changeDiv(obj){
 // alert(obj.id);
  div_tab1.style.display="none";
  div_tab2.style.display="none";
  var tid = document.getElementById('div_'+obj.id);
 // alert(tid);
  tid.style.display="";
  
 }
 </script>
</HTML>