function site(){

//创建两个数组含数组信息

var sfc=new Array("北京市","天津市","河北省","河南省");

var sqc=new Array("朝阳区","西城区","石家庄","邯郸市","西青区","武清区","郑州市","开封市");

//获取id=sf的控件

var sf=document.getElementById("sf");

initSelectSite(sf,sfc,0,sfc.length);

initSelectSite(sq,sqc,0,sqc.length);

}

/*给列表赋值的函数，传递四个参数：表单元素、数组元素、开始值、结束值*/

function initSelectSite(obj1,obj2,start,end){

for(var i=start;i<=end;i++){

     obj1.options.add(new Option(obj2[i],obj2[i]));

}

}