在jsp页面中用到的一段js觉得非常好

<script type="text/javascript">

var brandArr = new Array();//一数组
<logic:present name="mixBrandList">//逻辑标签？？
    <logic:iterate id="element" name="mixBrandList" indexId="index">//遍历该集合
 brandArr[<%=index.intValue()%>] = new Array("<bean:write name="element" property="label"/>",
   "<bean:write name="element" property="code"/>","<bean:write name="element" property="parentCode"/>");//指定数组的各个值
  </logic:iterate>
</logic:present>

function changeAsp(asp){
 m_obj1=document.forms[0].cmccBrandCode;
 m_obj1.length = 0;
 if(asp!="" && asp!="%"){
  if(brandArr.length>1){
   m_obj1.options[m_obj1.length] = new Option('请选择品牌', '%');
  }
  for ( var i = 0; i < brandArr.length; i++){
   if (brandArr[i][2] == asp){
    m_obj1.options[m_obj1.length] = new Option(brandArr[i][0], brandArr[i][1]);
   }
  }
 } 
}

<logic:present name="cityList">//市区集合
 var cityArr = new Array();
    <logic:iterate id="element" name="cityList" indexId="index">
 cityArr[<%=index.intValue()%>] = new Array("<bean:write name="element" property="label"/>",
   "<bean:write name="element" property="code"/>");
  </logic:iterate>
</logic:present>
<logic:present name="sectionList">
 var sectionArr = new Array();
    <logic:iterate id="element" name="sectionList" indexId="index">
 sectionArr[<%=index.intValue()%>] = new Array("<bean:write name="element" property="label"/>",
   "<bean:write name="element" property="code"/>");
  </logic:iterate>
</logic:present>

function changeEparchy(eparchyCode){
 m_obj1=document.forms[0].cityCode;
 m_obj1.length = 0;
 if(eparchyCode!="" && eparchyCode!="%"){
  if(cityArr.length>1){
   m_obj1.options[m_obj1.length] = new Option('全部区县', '%');
  }
  for ( var i = 0; i < cityArr.length; i++){
   if (cityArr[i][1].substring(0,2) == eparchyCode){
    m_obj1.options[m_obj1.length] = new Option(cityArr[i][0], cityArr[i][1]);
   }
  }
 } 
}

function changeCity(cityCode){
 m_obj1 = document.forms[0].sectionCode;
 m_obj1.length = 0;
 if(cityCode!="" && cityCode!="%"){
  if(sectionArr.length>1){
   m_obj1.options[m_obj1.length] = new Option('全部片区', '%');
  }
  for ( var i = 0; i < sectionArr.length; i++){
   if (sectionArr[i][1].substring(0,4) == cityCode){
    m_obj1.options[m_obj1.length] = new Option(sectionArr[i][0], sectionArr[i][1]);
   }
  }
 }
}

         function queryCondition(){
           document.forms[0].eventCode.value = "<%=AreaForm.EVENTCODE_QUERY_CITY%>";
           document.forms[0].submit();
         }
         function query(){
           document.forms[0].eventCode.value = "<%=AreaForm.EVENTCODE_QUERY_LIST%>";
           document.forms[0].submit();
         }
         function toTxt() {
           document.forms[0].eventCode.value = '<%=AreaForm.EVENTCODE_EXPORT_TXT%>';
           if(confirm("导出TXT文件时间较长，您需要导出吗？"))
           document.forms[0].submit();
         }
</script>