<script type="text/javascript">
function city()
{
   var arr=[["选择城市"],["海淀","东城","朝阳区"],["武汉","新洲","黄冈"],
            ["广州","珠海","佛山"],["浦东","新城"]];
    var index=document.getElementById("selid").selectedIndex;
    //alert(document.getElementById("selid").options[index].innerText);
    
    var  subnode=document.getElementById("subselid");
    var citys=arr[index];
    for(var x=0;x<citys.length;x++)
    {
    //alert(citys[x]);
    var optnode=document.createElement("option");r
    optnode.innerText=citys[x];//感觉这里没有实现获得innerText的功能。。。郁闷中
    subnode.appendChild(optnode);
    
    }
}