老师这样简单实现可以嘛

来源：7-6 编程练习

jia_蛙

2019-10-11 19:11:12

<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8">
<title>Document</title>
    <script type="text/javascript" src="index2.js"></script>
</head>
<body onload="address()">
<form>
省份：
<!--  请在此补充代码 -->
<select name="province" id="province"></select>
市/区：
<!--  请在此补充代码 -->
<select name="city" id="city"></select>
</form>
</body>
</html>

function address(){
    /*请在此补充代码*/  
    var province = document.getElementById("province");
    var city = document.getElementById("city");
    var provinceArray = ["北京市","天津市","河北省","河南省"];
    var cityArray = ["朝阳区","西城区","石家庄"];
    
    for(var i=0;i<provinceArray.length;i++){
        selectAdd(province,provinceArray[i],
        provinceArray[i]);
    }
    
     for(var z=0;z<cityArray.length;z++){
        selectAdd(city,cityArray[z],
        cityArray[z]);
    }
}


function selectAdd(obj,name,value){
    obj.options.add(new Option(name,value));
}

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