下拉列表二级连动(js)

<html>
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<head>
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<title>List</title>
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var onecount;
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onecount=0;
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subcat = new Array();
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subcat[0] = new Array("徐汇区","01","001");
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subcat[1] = new Array("嘉定区","01","002");
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subcat[2] = new Array("黄浦区","01","003");
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subcat[3] = new Array("南昌市","02","004");
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subcat[4] = new Array("九江市","02","005");
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subcat[5] = new Array("上饶市","02","006");
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onecount=6;
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function changelocation(locationid)
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{
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document.myform.smalllocation.length = 0;
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var locationid=locationid;
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var i;
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document.myform.smalllocation.options[0] = new Option('====所有地区====','');
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for (i=0;i < onecount; i++)
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{
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if (subcat[i][1] == locationid)
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{
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document.myform.smalllocation.options[document.myform.smalllocation.length] = new Option(subcat[i][0], subcat[i][2]);
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}
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}
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}
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</script>
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</head>
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<body>
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<form name="myform" method="post">
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<select name="biglocation" onChange="changelocation(document.myform.biglocation.options[document.myform.biglocation.selectedIndex].value)">
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<option value="01" selected>上海</option>
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<option value="02">江西</option>
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</select>
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<select name="smalllocation">
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<option selected value="">==所有地区==</option>
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</select>
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</form>
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<!--
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changelocation(document.myform.biglocation.options[document.myform.biglocation.selectedIndex].value);
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//-->
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</script>
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</body>
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</html>
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