layui 下拉菜单select 绑定数据

 // 下拉菜单的数据绑定
            var gradeData=['高一','高二','高三']
            var grade = document.getElementById("grade")
                $(document).ready(function(){
                    gradeData.forEach(element=>{
                        var option = document.createElement("option")
                        option.innerHTML = element
                        document.getElementById("grade").add(option)
                         form.render("select")  //一定要加上这一句，让select重新渲染
                })
            })