layui+ajax-select显示出来

1、看效果

方法一、

1、html部分

<div class="layui-form-item">
        <label class="layui-form-label">选择身份</label>
        <div class="layui-input-block">
        <select name="roleId" lay-verify="required" id="add_role_name">
  <option value="">请选着身份</option>
        </select>
</div>
</div>

2、js部分

var form,layedit,layer,laydate; 

layui.use(['form', 'layedit','layer','laydate'], function(){

            form = layui.form;
            layer = layui.layer
            layedit = layui.layedit

            laydate = layui.laydate; 

            selectRoleName();    //