function address(){

    /*请在此补充代码*/

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

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

//创建省份数组

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

//循环数组,添加条目栏

for (var i = 0; i < shengfenArray.length; i++) {

selectAdd(shengfen,shengfenArray[i],shengfenArray[i]);

}

}

function selectAdd(obj,name,value){

/*请在此补充代码*/  

obj.options.add(new Option(name,value));

}

function linkage(){

/*请在此补充代码*/ 

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

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

//获取到省份的value值

var shengfen1 = shengfen.value;

//创建城区数组

var beijinArray=["朝阳区","西城区"];

var tianjinArray=["西青区","武青区"];

var hebeiArray=["石家庄","邯郸市"];

var henanArray=["郑州市","开封市"];

//判断省份

if(shengfen1=="北京市"){

city.options.length=0;

for (var i = 0; i < beijinArray.length; i++) {

selectAdd(city,beijinArray[i],beijinArray[i])

}

}else if(shengfen1=="天津市"){

city.options.length=0;

for (var i = 0; i < tianjinArray.length; i++) {

selectAdd(city,tianjinArray[i],tianjinArray[i])

}

}else if(shengfen1=="河北省"){

city.options.length=0;

for (var i = 0; i < hebeiArray.length; i++) {

selectAdd(city,hebeiArray[i],hebeiArray[i])

}

}else if(shengfen1=="河南省"){

city.options.length=0;

for (var i = 0; i < henanArray.length; i++) {

selectAdd(city,henanArray[i],henanArray[i])

}

}

else{

city.options.length=0;

}

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

// var cityArray=new Array(beijingArray,tianjinArray,hebeiArray,henanArray);

// for (var i = 0; i < shengfenArray.length; i++) {

// if(shengfenArray[i]==)

// }

}