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Javascript对Option值得获取

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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>
  function getItem(){
   var xmlx = document.getElementById("xmlx");  
   alert(xmlx.options[xmlx.selectedIndex].text);
}
  </script>
</HEAD>

<BODY onload="">
  <form action="">   
     项目类型:
    <select id="xmlx">
    <option selected="selected">工程建设类</option>
    <option>资源交易类</option>
    <option>大宗物品类</option>
    </select>
项目名称:<input type="text" name="xmmc"> 
  <select name="ctime">
    <option value="">招标公告时间</option>
    <option value="">中标公共时间</option>    
      </select>:
<input type="text">
<button type="submit" onclick="getItem()">查询</button>  
  </form>
  <div></div>
</BODY>
</HTML>
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