JavaScript+Json写的二级联动

省市区的联动，相当常见
我就不写这么大数据的了，先写个简单的试一试
<!DOCTYPE html>

<html>

<head>

    <title></title>

    <meta charset="utf-8">

</head>

<body>

    <!--二级联动-->

    <div style="width:500px;margin:100px auto">

        <select id="oneDiv">

            <option selected>请选择</option>

            <option id="1">性别</option>

            <option id="2">种族</option>

            <option id="3">天赋</option>

        </select>

        <select id="childSelect">

            <option selected>请选择</option>

        </select>

    </div>

    <script>

        var Div = document.getElementById("oneDiv");

        Div.onchange = function () {

            var childLinkage = document.getElementById("childSelect");

            childLinkage.innerHTML = ""; // 每次进来先清空城市列表

            var divValue = this.value;

            var cities = [];

            switch (divValue) {

                case "请选择":

                    cities = ['请选择']

                    break;

                case "性别":

                    cities = ['男', '女']

                    break;

                case "种族":

                    cities = ['人族', '兽族', '妖族', '不死族']

                    break;

                case "天赋":

                    cities = ['敏捷', '耐力', '生命']

                    break;

            }

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

                var option = document.createElement('option'); //先创建option

                var textNode = document.createTextNode(cities[i]); //再把城市名作为子节点填入，也可用innerHTML

                option.appendChild(textNode);

                childLinkage.appendChild(option);

            }

        }

    </script>

</body>

</html>