//依賴資源

<link rel="stylesheet" type="text/css" href="${pageContext.request.contextPath}/src/layui-formSelects-master/dist/formSelects-v4.css" rel="external nofollow" />
<!-- 引入組件 -->
<script src="${pageContext.request.contextPath}/src/layui-formSelects-master/dist/formSelects-v4.js" type="text/javascript" charset="utf-8"></script>

//頁面顯示

<div class="layui-inline">
    <label class="layui-form-label" >角色：</label>
    <div class="layui-input-block" >
       <select name="role_id" id="role_id" xm-select-height="36px"
       xm-select-search xm-select-skin="default" xm-select="sys_role" lay-filter="sys_role">
       </select>
    </div>
  </div>

//配置路徑

layui.config({
    base: "${pageContext.request.contextPath }/src/layui-formSelects-master/dist/"    //formSelects-v4.js的路徑
  }).extend({
    formSelects: 'formSelects-v4'
  }).use(['form','jquery','upload','layer','formSelects'],function(){
    var form =layui.form,$ =layui.jquery,upload=layui.upload,layer=layui.layer,formSelects=layui.formSelects;
//從后臺數據庫中查出后回顯
    $.ajax({
      url: "${pageContext.request.contextPath}/menu/queryall.action",
      type: "post",
      success: function (data) {
        var str= '${sys_user.role_id}';
        str_arr= []; //str="1,2,3"
        str_arr= str.split(",");//獲取那些該選中的數據
         for(var i=0;i<data.data.length;i++){
           if(data.data[i].status==1){
             var option= new Option(data.data[i].role,data.data[i].id); //全部列表信息展示 }
              for(var j=0;j<str_arr.length;j++){
                if(str_arr[j]==data.data[i].id){
                   option.setAttribute("selected",true);//確定哪些是選中的
                }
               }
           }
          $("#role_id").append(option);
         }
        formSelects.render();//渲染效果
       }
       , error: function () {
        alert("查詢用戶角色失敗")
       }
    
   });