省市区三级联动的代码,如何修改让它获取初始值呢

省市区三级联动的代码,怎么修改让它获取初始值呢
省市区三级联动的代码,怎么修改让它获取初始值呢
<script type="text/javascript" src="get3j.js"></script>
<select id="sp" name ="sp"onChange="chgProvinces('sp','sc','sa')">
        <option></option>
    </select>
    <select id="sc" name ="sc"onChange="chgCitys('sc','sa')">
        <option></option>
    </select>
    <select id="sa" name ="sa" >
        <option></option>
    </select>
<script type="text/javascript">
loadData('sp', 'sc', 'sa');
</script>
------解决方案--------------------
将原代码的三个javascript函数分别替换为：

        function getProvinces(spid) {

            var sp = document.getElementById(spid);

            sp.options.length = 0;



            var pAs = provincesData.split(",");



			var i=-1,j=0

            for (var pA in pAs) {

                var pA_parts = pAs[pA].split("
------解决方案--------------------
");

                sp.options.add(new Option(pA_parts[1], pA_parts[0]));

				i=i+1

				if (pA_parts[1]=="<%=request.querystring("p")%>"){j=i}

            }



            if (sp.options.length == 0) {

                sp.disabled = true;

                sp.options.add(new Option("", "000000"));

            }

            else {

                sp.disabled = false;

            }



            sp.options[j].selected = true;

        }



        function getCitys(scid, spid) {

            var sc = document.getElementById(scid);

            sc.options.length = 0;



            var sp = document.getElementById(spid);

            var pv = sp.options[sp.selectedIndex].value;



            var cAs = citysData.split(",");