var diqul;
function makeshangquan(x)
{
    var shangquan=document.agentform.shangquan;//方便引用
    for(m=shangquan.options.length-1;m>=0;m--)
 　{
  　　//这个要看清楚,因为要重新填充下拉列表的话必须先清除里面原有的项,

　　　//清除和增加当然是有区别的了,所以用递减
        shangquan.options[m]=null;//将该项设置为空,也就等于清除了
 　}
    for(j=0;j<diqul[x].length;j++)//这个循环是填充下拉列表
   { 
        shangquan.options[j]=new Option(diqul[x][j].text,diqul[x][j].value)
        //shangquan[j] = diqul[x][j];//也正确
        //注意上面这据,列表的当前项等于 新项(数组对象的x,j项的文本为文本，)
     //或者直接赋值 shangquan.options[j]=diqul[x][j];  因为diqul[][]这个二维数组下放的就是Option对象
    }
}
function initd()
{
    mylength=document.agentform.quxian.options.length;
    diqul=new Array(mylength)//新建一个数组，项数为第一个下拉列表的项数
    for(i=0;i<mylength;i++)//循环第一个下拉列表的项数那么多次
    {
       diqul[i]=new Array();//子循环
    }
  //下面是给每个循环赋值


//朝阳
  diqul[0][0]=new Option("商圈不限","商圈不限");
  diqul[0][1]=new Option("团结湖","团结湖");
  diqul[0][2]=new Option("燕莎","燕莎");
  diqul[0][3]=new Option("望京","望京");
  diqul[0][4]=new Option("国展","国展");
  diqul[0][5]=new Option("国贸","国贸");
  diqul[0][6]=new Option("三元桥","三元桥");
  diqul[0][7]=new Option("红庙","红庙");
  diqul[0][8]=new Option("十里堡","十里堡");
  diqul[0][9]=new Option("东八里庄","东八里庄");
  diqul[0][10]=new Option("劲松","劲松");
  diqul[0][11]=new Option("亚运村","亚运村");
  diqul[0][12]=new Option("朝阳公园","朝阳公园");
  diqul[0][13]=new Option("酒仙桥","酒仙桥");
  diqul[0][14]=new Option("北沙滩","北沙滩");
  diqul[0][15]=new Option("定福庄","定福庄");
  diqul[0][16]=new Option("管庄","管庄");
  diqul[0][17]=new Option("双井","双井");
  diqul[0][18]=new Option("潘家园","潘家园");
  diqul[0][19]=new Option("东大桥","东大桥");
  diqul[0][20]=new Option("安贞","安贞");
  diqul[0][21]=new Option("西坝河","西坝河");
  diqul[0][22]=new Option("芍药居","芍药居");
  diqul[0][23]=new Option("垡头","垡头");
  diqul[0][24]=new Option("十八里店","十八里店");
  diqul[0][25]=new Option("大山子","大山子");
  diqul[0][26]=new Option("北工大","北工大");
  diqul[0][27]=new Option("亚运村小营","亚运村小营");
  diqul[0][28]=new Option("小红门","小红门");
  diqul[0][29]=new Option("朝青","朝青");
  diqul[0][30]=new Option("首都机场","首都机场");
  diqul[0][31]=new Option("石佛营","石佛营");
  diqul[0][32]=new Option("平乐园","平乐园");
  diqul[0][33]=new Option("马甸","马甸");
  diqul[0][34]=new Option("柳芳","柳芳");
  diqul[0][35]=new Option("来广营","来广营");
  diqul[0][36]=new Option("花家地","花家地");
  diqul[0][37]=new Option("广渠路","广渠路");
  diqul[0][38]=new Option("工体","工体");
  diqul[0][39]=new Option("高碑店","高碑店");
  diqul[0][40]=new Option("豆各庄","豆各庄");
  diqul[0][41]=new Option("东坝","东坝");
  diqul[0][42]=new Option("CBD","CBD");
  diqul[0][43]=new Option("朝阳门","朝阳门");
  diqul[0][44]=new Option("常营","常营");
  diqul[0][45]=new Option("奥林匹克公园","奥林匹克公园");
  diqul[0][46]=new Option("安慧桥","安慧桥");
  diqul[0][47]=new Option("亚奥","亚奥");
  diqul[0][48]=new Option("北苑","北苑");

//海淀
  diqul[1][0]=new Option("商圈不限","商圈不限");
  diqul[1][1]=new Option("公主坟","公主坟");
  diqul[1][2]=new Option("北京大学","北京大学");
  diqul[1][3]=new Option("双榆树","双榆树");
  diqul[1][4]=new Option("中关村","中关村");
  diqul[1][5]=new Option("北太平庄","北太平庄");
  diqul[1][6]=new Option("魏公村","魏公村");
  diqul[1][7]=new Option("大钟寺","大钟寺");
  diqul[1][8]=new Option("五道口","五道口");
  diqul[1][9]=new Option("学院路","学院路");
  diqul[1][10]=new Option("蓟门桥","蓟门桥");
  diqul[1][11]=new Option("航天桥","航天桥");
  diqul[1][12]=new Option("二里庄","二里庄");
  diqul[1][13]=new Option("知春路","知春路");
  diqul[1][14]=new Option("车道沟","车道沟");
  diqul[1][15]=new Option("上地","上地");
  diqul[1][16]=new Option("圆明园","圆明园");
  diqul[1][17]=new Option("甘家口","甘家口");
  diqul[1][18]=new Option("农大","农大");
  diqul[1][19]=new Option("牡丹园","牡丹园");
  diqul[1][20]=new Option("定慧寺","定慧寺");
  diqul[1][21]=new Option("紫竹桥","紫竹桥");
  diqul[1][22]=new Option("皂君庙","皂君庙");
  diqul[1][23]=new Option("万柳","万柳");
  diqul[1][24]=new Option("西三旗","西三旗");
  diqul[1][25]=new Option("清河","清河");
  diqul[1][26]=new Option("小西天","小西天");
  diqul[1][27]=new Option("西山","西山");
  diqul[1][28]=new Option("苏州桥","苏州桥");
  diqul[1][29]=new Option("马连洼","马连洼");
  diqul[1][30]=new Option("车公庄","车公庄");
  diqul[1][31]=new Option("颐和园","颐和园");
  diqul[1][32]=new Option("黄庄","黄庄");
  diqul[1][33]=new Option("四季青","四季青");
  diqul[1][34]=new Option("玉泉路","玉泉路");
  diqul[1][35]=new Option("五棵松","五棵松");
  diqul[1][36]=new Option("军博","军博");
  diqul[1][37]=new Option("清华园","清华园");
  diqul[1][38]=new Option("万泉河","万泉河");
  diqul[1][39]=new Option("万寿寺","万寿寺");
  diqul[1][40]=new Option("八里庄","八里庄");
  diqul[1][41]=new Option("永定路","永定路");
  diqul[1][42]=new Option("曙光花园","曙光花园");
  diqul[1][43]=new Option("世纪城","世纪城");

//丰台
  diqul[2][0]=new Option("商圈不限","商圈不限");
  diqul[2][1]=new Option("方庄","方庄");
  diqul[2][2]=new Option("西罗园","西罗园");
  diqul[2][3]=new Option("六里桥","六里桥");
  diqul[2][4]=new Option("洋桥","洋桥");
  diqul[2][5]=new Option("西客站","西客站");
  diqul[2][6]=new Option("角门","角门");
  diqul[2][7]=new Option("木樨园","木樨园");
  diqul[2][8]=new Option("赵公口","赵公口");
  diqul[2][9]=new Option("马家堡","马家堡");
  diqul[2][10]=new Option("刘家窑","刘家窑");
  diqul[2][11]=new Option("菜户营","菜户营");
  diqul[2][12]=new Option("成寿寺","成寿寺");
  diqul[2][13]=new Option("大红门","大红门");
  diqul[2][14]=new Option("西局","西局");
  diqul[2][15]=new Option("北大地","北大地");
  diqul[2][16]=new Option("科技园区","科技园区");
  diqul[2][17]=new Option("卢沟桥","卢沟桥");
  diqul[2][18]=new Option("草桥","草桥");
  diqul[2][19]=new Option("嘉园","嘉园");
  diqul[2][20]=new Option("左安门","左安门");
  diqul[2][21]=new Option("岳各庄","岳各庄");
  diqul[2][22]=new Option("玉泉营","玉泉营");
  diqul[2][23]=new Option("右安门","右安门");
  diqul[2][24]=new Option("青塔","青塔");
  diqul[2][25]=new Option("蒲黄榆","蒲黄榆");
  diqul[2][26]=new Option("丽泽桥","丽泽桥");
  diqul[2][27]=new Option("长辛店","长辛店");
  diqul[2][28]=new Option("周口店","周口店");
  diqul[2][29]=new Option("云岗","云岗");
  diqul[2][30]=new Option("花乡","花乡");
  diqul[2][31]=new Option("和义","和义");
  diqul[2][32]=new Option("丰台体育馆","丰台体育馆");
  diqul[2][33]=new Option("东高地","东高地");
  diqul[2][34]=new Option("新发地","新发地");
  diqul[2][35]=new Option("太平桥","太平桥");

//崇文
  diqul[3][0]=new Option("商圈不限","商圈不限");
  diqul[3][1]=new Option("东花市","东花市");
  diqul[3][2]=new Option("崇文门","崇文门");
  diqul[3][3]=new Option("光明楼","光明楼");
  diqul[3][4]=new Option("天坛","天坛");
  diqul[3][5]=new Option("广渠门内","广渠门内");
  diqul[3][6]=new Option("永定门","永定门");
  diqul[3][7]=new Option("龙潭湖","龙潭湖");
  diqul[3][8]=new Option("前门","前门");
  diqul[3][9]=new Option("新世界","新世界");
  diqul[3][10]=new Option("磁器口","磁器口");

//东城
  diqul[4][0]=new Option("商圈不限","商圈不限");
  diqul[4][1]=new Option("王府井","王府井");
  diqul[4][2]=new Option("灯市口","灯市口");
  diqul[4][3]=new Option("东四十条","东四十条");
  diqul[4][4]=new Option("东直门","东直门");
  diqul[4][5]=new Option("安定门","安定门");
  diqul[4][6]=new Option("雍和宫","雍和宫");
  diqul[4][7]=new Option("和平里","和平里");
  diqul[4][8]=new Option("建国门","建国门");
  diqul[4][9]=new Option("北新桥","北新桥");
  diqul[4][10]=new Option("东四","东四");
  diqul[4][11]=new Option("交道口","交道口");
  diqul[4][12]=new Option("东单","东单");
  diqul[4][13]=new Option("建国门","建国门");

//西城
  diqul[5][0]=new Option("商圈不限","商圈不限");
  diqul[5][1]=new Option("复兴门","复兴门");
  diqul[5][2]=new Option("阜成门","阜成门");
  diqul[5][3]=new Option("西单","西单");
  diqul[5][4]=new Option("木樨地","木樨地");
  diqul[5][5]=new Option("德胜门","德胜门");
  diqul[5][6]=new Option("三里河","三里河");
  diqul[5][7]=new Option("月坛","月坛");
  diqul[5][8]=new Option("金融街","金融街");
  diqul[5][9]=new Option("六铺炕","六铺炕");
  diqul[5][10]=new Option("积水潭","积水潭");
  diqul[5][11]=new Option("展览路","展览路");
  diqul[5][12]=new Option("西便门","西便门");
  diqul[5][13]=new Option("什刹海","什刹海");
  diqul[5][14]=new Option("马甸","马甸");
  diqul[5][15]=new Option("官园","官园");
  diqul[5][16]=new Option("车公庄","车公庄");
  diqul[5][17]=new Option("鼓楼大街","鼓楼大街");
  diqul[5][18]=new Option("地安门","地安门");
  diqul[5][19]=new Option("礼士路","礼士路");
  diqul[5][20]=new Option("小马厂","小马厂");
  diqul[5][21]=new Option("新街口","新街口");
  diqul[5][22]=new Option("西直门","西直门");
  diqul[5][23]=new Option("百万庄","百万庄");

//宣武
  diqul[6][0]=new Option("商圈不限","商圈不限");
  diqul[6][1]=new Option("长椿街","长椿街");
  diqul[6][2]=new Option("广安门","广安门");
  diqul[6][3]=new Option("陶然亭","陶然亭");
  diqul[6][4]=new Option("天宁寺","天宁寺");
  diqul[6][5]=new Option("白纸坊","白纸坊");
  diqul[6][6]=new Option("马连道","马连道");
  diqul[6][7]=new Option("牛街","牛街");
  diqul[6][8]=new Option("虎坊桥","虎坊桥");
  diqul[6][9]=new Option("大栅栏","大栅栏");
  diqul[6][10]=new Option("宣武门","宣武门");
  diqul[6][11]=new Option("大观园","大观园");
  diqul[6][12]=new Option("先农坛","先农坛");
  diqul[6][13]=new Option("白广路","白广路");

//石景山
  diqul[7][0]=new Option("商圈不限","商圈不限");
  diqul[7][1]=new Option("老古城","老古城");
  diqul[7][2]=new Option("苹果园","苹果园");
  diqul[7][3]=new Option("八角","八角");
  diqul[7][4]=new Option("鲁谷","鲁谷");
  diqul[7][5]=new Option("杨庄","杨庄");
  diqul[7][6]=new Option("模式口","模式口");
  diqul[7][7]=new Option("八宝山","八宝山");
  diqul[7][8]=new Option("古城","古城");
  diqul[7][9]=new Option("八大处","八大处");
  diqul[7][10]=new Option("石景山","石景山");
  diqul[7][11]=new Option("永乐","永乐");
  diqul[7][12]=new Option("老山","老山");
  diqul[7][13]=new Option("高井","高井");
  diqul[7][14]=new Option("金顶街","金顶街");

//昌平
  diqul[8][0]=new Option("商圈不限","商圈不限");
  diqul[8][1]=new Option("立水桥","立水桥");
  diqul[8][2]=new Option("小汤山","小汤山");
  diqul[8][3]=new Option("回龙观","回龙观");
  diqul[8][4]=new Option("天通苑","天通苑");
  diqul[8][5]=new Option("北七家","北七家");
  diqul[8][6]=new Option("西二旗","西二旗");
  diqul[8][7]=new Option("霍营","霍营");
  diqul[8][8]=new Option("沙河","沙河");
  diqul[8][9]=new Option("南口","南口");
  diqul[8][10]=new Option("百善镇","百善镇");
  diqul[8][11]=new Option("昌平县城","昌平县城");
  diqul[8][12]=new Option("阳坊","阳坊");

//通州
  diqul[9][0]=new Option("商圈不限","商圈不限");
  diqul[9][1]=new Option("西上园","西上园");
  diqul[9][2]=new Option("梨园","梨园");
  diqul[9][3]=new Option("通州北苑","通州北苑");
  diqul[9][4]=new Option("土桥","土桥");
  diqul[9][5]=new Option("新华大街","新华大街");
  diqul[9][6]=new Option("新华联","新华联");
  diqul[9][7]=new Option("果园","果园");
  diqul[9][8]=new Option("西马庄","西马庄");
  diqul[9][9]=new Option("北关","北关");
  diqul[9][10]=new Option("中仓","中仓");
  diqul[9][11]=new Option("玉桥","玉桥");
  diqul[9][12]=new Option("东关","东关");
  diqul[9][13]=new Option("永顺","永顺");
  diqul[9][14]=new Option("永乐店","永乐店");
  diqul[9][15]=new Option("乔庄","乔庄");
  diqul[9][16]=new Option("九棵树","九棵树");
  diqul[9][17]=new Option("运河大街","运河大街");
  diqul[9][18]=new Option("武夷花园","武夷花园");
  diqul[9][19]=new Option("东潞园","东潞园");

//大兴
  diqul[10][0]=new Option("商圈不限","商圈不限");
  diqul[10][1]=new Option("西红门","西红门");
  diqul[10][2]=new Option("黄村","黄村");
  diqul[10][3]=new Option("亦庄","亦庄");
  diqul[10][4]=new Option("旧宫","旧宫");

//顺义
  diqul[11][0]=new Option("商圈不限","商圈不限");
  diqul[11][1]=new Option("温榆河","温榆河");
  diqul[11][2]=new Option("顺义城","顺义城");
  diqul[11][3]=new Option("空港工业区","空港工业区");
  diqul[11][4]=new Option("马坡","马坡");
  diqul[11][5]=new Option("京顺高速路","京顺高速路");
  diqul[11][6]=new Option("首都机场","首都机场");
  diqul[11][7]=new Option("中央别墅区","中央别墅区");

//怀柔
  diqul[12][0]=new Option("商圈不限","商圈不限");
  diqul[12][1]=new Option("怀柔","怀柔");

//房山
  diqul[13][0]=new Option("商圈不限","商圈不限");
  diqul[13][1]=new Option("窦店","窦店");
  diqul[13][2]=new Option("琉璃河","琉璃河");
  diqul[13][3]=new Option("良乡","良乡");
  diqul[13][4]=new Option("行宫","行宫");
  diqul[13][5]=new Option("周口店","周口店");
  diqul[13][6]=new Option("房山城关","房山城关");
  diqul[13][7]=new Option("太平庄","太平庄");
  diqul[13][8]=new Option("燕山 ","燕山 ");
  diqul[13][9]=new Option("闫村","闫村");
  diqul[13][10]=new Option("青龙湖","青龙湖");
  diqul[13][11]=new Option("韩村河","韩村河");
  diqul[13][12]=new Option("长阳","长阳");

//门头沟
  diqul[14][0]=new Option("商圈不限","商圈不限");
  diqul[14][1]=new Option("大峪","大峪");
  diqul[14][2]=new Option("双峪","双峪");

//密云
  diqul[15][0]=new Option("商圈不限","商圈不限");
  diqul[15][1]=new Option("密云","密云");

//平谷
  diqul[16][0]=new Option("商圈不限","商圈不限");
  diqul[16][1]=new Option("平谷","平谷");

//延庆
  diqul[17][0]=new Option("商圈不限","商圈不限");
  diqul[17][1]=new Option("八达岭","八达岭");
  diqul[17][2]=new Option("张山营","张山营");



   agentform.quxian.options[0].selected=true;
   agentform.shangquan.options[0].selected=true;
}
onload=initd;  //这叫事件委托  委托的时候不带方法标志 只带方法名