用JAVASCRIPT如何将<SELECT>中的所有OPTIONS选项显示出来

<form name="myform" method="post">
<select name="biglocation">
 <option value="01" selected>上海</option>
        <option value="02">江西</option>
    </select>
    <select name="smalllocation"> 
        <option selected value="">==所有地区1==</option>
<option selected value="">==所有地区2==</option>
    </select>
</form>
<SCRIPT LANGUAGE="JavaScript">
<!--
var op="";
for(i=0;i<document.all.smalllocation.options.length;i++)
{
  op += i+" text:"+document.all.smalllocation.options[i].text;
  op +=" value:"+document.all.smalllocation.options[i].value+"<br>";
}
//-->
document.write(op);
</SCRIPT>

解决方案 »

  1.   

    程序是这样的
    <html>
    <head>
    <title>List</title>
    <meta http-equiv="Content-Type" content="text/html; charset=gb2312">
    <script LANGUAGE="javascript">
    <!--
    var onecount;
    onecount=0;
        
    subcat = new Array();
    subcat[0] = new Array("徐汇区","01","001");
    subcat[1] = new Array("嘉定区","01","002");
    subcat[2] = new Array("黄浦区","01","003");
    subcat[3] = new Array("南昌市","02","004");
    subcat[4] = new Array("九江市","02","005");
    subcat[5] = new Array("上饶市","02","006");onecount=6;function changelocation(locationid)
        {
        document.myform.smalllocation.length = 0;     var locationid=locationid;
        var i;
        document.myform.smalllocation.options[0] = new Option('====所有地区====','');
        for (i=0;i < onecount; i++)
            {
                if (subcat[i][1] == locationid)
                { 
                document.myform.smalllocation.options[document.myform.smalllocation.length] = new Option(subcat[i][0], subcat[i][2]);
                }        
            }
            
        }    //-->
    </script>
    </head>
    <body>
    <form name="myform" method="post">
        <select name="biglocation" onChange="changelocation(document.myform.biglocation.options[document.myform.biglocation.selectedIndex].value)">
            <option value="01" selected>上海</option>
            <option value="02">江西</option>
        </select>
        <select name="smalllocation"> 
            <option selected value="">==所有地区==</option>
        </select>
    </form>
    <script LANGUAGE="javascript"> 
    <!-- 
        changelocation(document.myform.biglocation.options[document.myform.biglocation.selectedIndex].value); 
    //--> 
    </script>
    </body>
    </html>
    将smalllocation的OPTION显示