Implémenter une liaison de zone de sélection basée sur layui

<div class="x-body">
    <form class="layui-form" action="" method="post">
        <div class="layui-form-item">
            <label class="layui-form-label">选择地区</label>
            <div class="layui-input-inline">
                <select name="province" lay-filter="province" id="s_p">
                    <option value="1">请选择省</option>
                </select>
            </div>
            <div class="layui-input-inline">
                <select name="city" lay-filter="city" id="s_c">
                    <option value="1">请选择市</option>
                </select>
            </div>
            <div class="layui-input-inline">
                <select name="area" lay-filter="area" id="s_x">
                    <option value="1">请选择区/县</option>
                </select>
            </div>
        </div>
        <div>
            <label class="layui-form-label">选择地区</label>
            <div class="layui-input-inline">
                <select name="towns" lay-filter="towns" id="s_t">
                    <option value="1">请选择乡镇/街道</option>
                </select>
            </div>
            <!--<div class="layui-input-inline">-->
                <!--<select name="burg" lay-filter="burg" id="s_b">-->
                    <!--<option value="1">庄/村</option>-->
                <!--</select>-->
            <!--</div>-->
        </div>
    </form>
</div>

<script type="text/javascript">

    layui.use([&#39;form&#39;, &#39;layer&#39;, &#39;laytpl&#39;, &#39;jquery&#39;], function () {
        var form = layui.form
            , $ = layui.jquery;

        var parentId = &#39;0&#39;;
        $(function () {
            $.post(serverPath + "sys/area/backProvince/" + parentId, function (result) {
                var p = result;
                for (v in p) {
                    var pp = p[v].id;
                    $("#s_p").append("<option value=" + pp + ">" + p[v].fullname + "</option>")
                }
                form.render();
            })

            form.on(&#39;select(province)&#39;, function (data) {
                var p = $("#s_p").val();
                if (p != "1") {
                    $.post(serverPath + "sys/area/backProvince/" + p, function (result) {
                        var c = result;
                        $("#s_c").html("");
                        $("#s_c").append("<option value=&#39;1&#39;>请选择市</option>");
                        $("#s_x").html("");
                        $("#s_x").append("<option value=&#39;1&#39;>请选择县/区</option>");
                        $("#s_t").html("");
                        $("#s_t").append("<option value=&#39;1&#39;>请选择乡镇/街道</option>");
                        $("#s_b").html("");
                        $("#s_b").append("<option value=&#39;1&#39;>请选择村/街道号</option>");
                        for (v in c) {
                            var cc = c[v].id;
                            $("#s_c").append("<option value=" + cc + ">" + c[v].fullname + "</option>")
                        }
                        form.render();
                    })
                }
            });
            form.on(&#39;select(city)&#39;, function (data) {
                var c = $("#s_c").val();
                if (c != "1") {
                    $.post(serverPath + "sys/area/backProvince/" + c, function (result) {
                        var x = result;
                        $("#s_x").html("");
                        $("#s_x").append("<option value=&#39;1&#39;>请选择县/区</option>");
                        $("#s_t").html("");
                        $("#s_t").append("<option value=&#39;1&#39;>请选择乡镇/街道</option>");
                        $("#s_b").html("");
                        $("#s_b").append("<option value=&#39;1&#39;>请选择村/街道号</option>");
                        for (v in x) {
                            var xx = x[v].id;

                            $("#s_x").append("<option value=" + xx + ">" + x[v].fullname + "</option>")
                        }
                        form.render();
                    });
                }
            });
            form.on(&#39;select(area)&#39;, function (data) {
                var x = $("#s_x").val();
                if (x != "1") {
                    $.post(serverPath + &#39;sys/area/backProvince/&#39;+ x, function (result) {
                        var t = result;
                        $("#s_t").html("");
                        $("#s_t").append("<option value=&#39;1&#39;>请选择乡镇/街道</option>");
                        $("#s_b").html("");
                        $("#s_b").append("<option value=&#39;1&#39;>请选择村/街道号</option>");
                        for (v in t) {
                            var xx = t[v].id;
                            $("#s_t").append("<option value=" + xx + ">" + t[v].fullname + "</option>")
                        }
                        form.render();
                    });
                }
            });


        });
    });


</script>