js 部分

 <script src="./layui/layui.js"></script>
    <script>
      // 組件路徑
        layui.config({
            base: './js/'
        }).extend({
            bioarea: 'bioarea'
        });
    </script>
    <script>
        layui.use(['form', 'bioarea'], function() {
           
            var form = layui.form
                , bioarea = layui.bioarea

            bioarea.render({
                elem: '#bioarea-wrap',
                defaultData: {
                    provinceCode: '110000',
                    cityCode: '110100',
                    countyCode: '110113'
                },
                form
            })
            //監聽(tīng)提交
            form.on('submit(demo1)', function(data) {
                layer.alert(JSON.stringify(data.field), {
                    title: '最終的提交信息'
                })
                return false;
            });


            //表單取值
            layui.$('#LAY-component-form-getval').on('click', function() {
                var data = form.val('example');
                console.log(data);
                alert(JSON.stringify(data));
            });

        });
    </script>

---

html 部分

 <form class="layui-form bio-form-box" action="" lay-filter="example">
        <div class="layui-col-xs12">
            <div class="layui-form-item" id="bioarea-wrap">
                <label class="layui-form-label add-width required">所屬地域</label>
                <label class="layui-form-label small-width">省</label>
                <div class="layui-input-inline">
                    <select style="width: 100px;" class="level-1-select" lay-filter="#bioarea-wrap1level"
                        name="province">
                        <option value="">請選擇省</option>
                    </select>
                </div>
                <label class="layui-form-label small-width">市</label>
                <div class="layui-input-inline">
                    <select class="level-2-select" lay-filter="#bioarea-wrap2level" name="city">
                        <option value="">請選擇市</option>
                    </select>
                </div>
                <label class="layui-form-label small-width">區</label>
                <div class="layui-input-inline">
                    <select class="level-3-select" lay-filter="#bioarea-wrap3level" name="county">
                        <option value="">請選擇市</option>
                    </select>
                </div>
            </div>
        </div>
        </div>
    </form>