1、后台接口

    @RequestMapping(value = "/getUserList")
    @ResponseBody
    public R getUserList() {
        List<TbUser> list = tbUserMapper.getList();

        return R.OK(list);
    }

返回值数据：

2、页面的dom定义

        <div class="layui-form-item">
            <select name="selectCity" id="selectCity">
                <option value="">请选择省</option>
                <option value="浙江" selected>浙江省</option>
                <option value="你的工号">江西省</option>
                <option value="你最喜欢的老师">福建省</option>
            </select>
        </div>

3、初始化下拉列表js

        // 动态添加选项
        var persons = [];
        $.post('/index/getUserList.do',{}, function (res) {
            if(res.code == 200) {
                persons = res.data;

                // 初始化下拉框
                var selectCity = document.getElementById('selectCity');
                selectCity.options.length = 0;
                for (var i = 0; i < persons.length; i++) {
                    var option = new Option(persons[i].userName, persons[i].userId);
                    selectCity.options.add(option);
                }
            }
        });
        // 重新渲染表单
        form.render('select');