省市县联动（存在部分bug）_省市县联动的code和后面县的前四位没对上-优快云博客

本文链接：https://blog.youkuaiyun.com/weixin_38052444/article/details/81810279

<!DOCTYPE html>
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <script>
            var province=["北京","上海","福建","江苏"]
            var city_2=["福州","泉州","厦门"]
            var city_3=["南京","苏州"]
            var county_2_0=["台江","鼓楼","仓山","闽侯"]
            var county_2_1=["晋江","石狮","惠安"]
            var county_2_2=["思明","湖里","集美"]
            var county_3_0=["玄武","秦淮"]
            var county_3_1=["姑苏","吴中"]
        function init() {
            for (var i=0;i<province.length;i++)
            {
                document.myform.province.options[i]=new Option(province[i],i);
            }
             document.myform.province.onchange = new Function("change(this)");
            }
            function change(obj){  //obj代表对象，obj.value代表对象的值。这里的obj代表province
                pro=obj.value;//pro代表省份的编码值
                city=eval('city_'+pro)
                if(pro<2){
                        document.myform.city.options[pro].length=0;
                        document.myform.county.options[pro].length=0;
                    }
                if(pro>=2){
                    for (var i = 0; i < city.length; i++) {
                        document.myform.city.options[i] =new Option(city[i], i);
                    }
                }
                document.myform.city.onchange = new Function("changecounty(this)");
            }
            function changecounty(ci) {
                cit=ci.value;//pro代表城市的编码值
                county=eval('county_'+pro+'_'+cit)
                for (var i = 0; i < county.length;i++) {
                    document.myform.county.options[i] =new Option(county[i], i);
                }
            }
    </script>
</head>
<body onload="init()">
 <form action="ok.html" method="post" name="myform">
        <select name="province" id="province">
        </select>省
        <select name="city" id="city">
            <option value=""></option>
        </select> 市
        <select name="county" id="county">
            <option value=""></option>
        </select>区/县
 </form>
</body>
</html>