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JS联动获取下拉框列表

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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML>
 <HEAD>
  <TITLE> New Document </TITLE>
  <META NAME="Generator" CONTENT="EditPlus">
  <META NAME="Author" CONTENT="">
  <META NAME="Keywords" CONTENT="">
  <META NAME="Description" CONTENT="">
  <script language="javascript">
  function changeCity()
  {
     var provice = document.getElementById('privence');
  var index = provice.selectedIndex;
  var city = document.getElementById('city1');
  alert(index);
  if(index==1)
  {
    var hunan = new Option('湖南',hunan);
    city.options.add(hunan);

  }
  }
  </script>
 </HEAD>

 <BODY>
<form>
<table>
<tr>
<td>
<select name="privence" style="width:100px;" id="privence" onChange="changeCity()">
<option>请选择省份 </option>
<option value="shandong">山东 </option>
<option value="jiangxi">江西 </option>
</select>
</td>
<td>
<select name="city1" style="width:100px;" id="city1">

</select>
</td>
</tr>
</table>
</form>


 </BODY>
</HTML>

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