layadmin 下拉框请求后台数据

    <div class="layui-form-item" style="margin-top: 20px;">
        <label class="layui-form-label">公众号</label>
        <div class="layui-input-block">
            <select name="wechat_id" id="wechat_select" lay-search>
                <option value="">选择公众号</option>
            </select>
        </div>
    </div>

                            admin.req({
                                url: n.pageUrls.mp_select,
                                type: 'get',
                                done: function (res) {
                                    console.log(res);

                                    $.each(res.data.wechat, function (i, m) {
                                        $('#wechat_select').append('<option value="' + m.wechat_id + '" >' + m.wechat_name + '</option>');
                                    })
                                    form.render('select');
                                }
                            })