JS清除dropdownlist绑定的项，并添加新项

•  <script type="text/javascript"> 
  /*删除项*/
  document.getElementById('KeyList').options.length = 0;
  /*添加项*/
  document.getElementById("KeyList").options.add(new Option( "English Title", "en_title"));
  document.getElementById("KeyList").options.add(new Option( "English Keywords", "en_key_word"));
  document.getElementById("KeyList").options.add(new Option( "Abstract", "en_abstract"));
  document.getElementById("KeyList").options.add(new Option( "Fund Project", "fund_project"));
  document.getElementById("KeyList").options.add(new Option( "Institution(in English)", "en_institution"));
  document.getElementById("KeyList").options.add(new Option( "DOI", "doi"));
  document.getElementById("KeyList").options.add(new Option( "Author", "pin_yin_name"));
  </script>

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