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<form name="f1"><select name="s1"
 onchange="chg(document.f1.s1,document.f1.s2)">
 <option value="½­Î÷">½­Î÷</option>
 <option value="¸£½¨">¸£½¨</option>
</select><select name="s2">
 <option value="1">1</option>
</select></form>
<script>
 //´´½¨¶ÔÏó£¬Êý¾Ý£¬Öµ£¬Îı¾
 function obj(aData, aValue, aText) {
  this.Data = aData;
  this.Value = aValue;
  this.Text = aText;
 }
 //ÉèÖÃÑ¡ÏîÊý¾ÝÊý×飬¿ÉÒÔÌí¼Ó¶à¸ö²ÎÊýΪ"Ô´µØÖ·,Ñ¡ÔñÖµ£¬Ñ¡ÔñÎı¾"
 var Set_data = new Array(
                       new obj('½­Î÷', 'Äϲý', 'Äϲý'),
                       new obj('½­Î÷', '¾Å½­','¾Å½­'),
                       new obj('¸£½¨', '¸£ÖÝ', '¸£ÖÝ'),
                       new obj('¸£½¨', 'ÏÃÃÅ', 'ÏÃÃÅ'));
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 function chg(parent, child) {
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  chgComitem(parent.options[parent.selectedIndex].value, child, Set_data);
 }
 function chgComitem(parentValue, child, objs) {
  //¸Ä±ä×Ӳ˵¥ //1.ÒÔ×Ӳ˵¥Îª²ÎÊýµ÷Óú¯Êý 
  DelAllComitem(child);
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  for (i = 0; i < objs.length; i++) {
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   if (objs[i].Data == parentValue)
    //3.ÒÔ×Ӳ˵¥£¬Ñ¡ÏîÊý¾ÝµÄÖµ£


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