<div class="layui-btn-group demoTable">

 <button class="layui-btn" data-type="getCheckData">获取选中行数据</button>
 <button class="layui-btn" data-type="getCheckLength">获取选中数目</button>
 <button class="layui-btn" data-type="isAll">验证是否全选</button>
</div>

<table class="layui-table" lay-data="{width: 892, height:332, url:'/demo/table/user/', page:true, id:'idTest'}" lay-filter="demo">
 <thead>
  <tr>
   <th lay-data="{type:'checkbox', fixed: 'left'}"></th>
   <th lay-data="{field:'id', width:80, sort: true, fixed: true}">ID</th>
   <th lay-data="{field:'username', width:80}">用户名</th>
   <th lay-data="{field:'sex', width:80, sort: true}">性别</th>
   <th lay-data="{field:'city', width:80}">城市</th>
   <th lay-data="{field:'sign', width:160}">签名</th>
   <th lay-data="{field:'experience', width:80, sort: true}">积分</th>
   
   <th lay-data="{field:'classify', width:80}">职业</th>
   <th lay-data="{field:'wealth', width:135, sort: true}">财富</th>
   <th lay-data="{field:'score', width:80, sort: true, fixed: 'right'}">评分</th>
   <th lay-data="{fixed: 'right', width:178, align:'center', toolbar: '#barDemo'}"></th>
  </tr>
 </thead>
</table>

<script>
layui.use('table', function(){
 var table = layui.table;
 
 var $ = layui.$, active = {
  getCheckData: function(){ //获取选中数据
   var checkStatus = table.checkStatus('idTest')
   ,data = checkStatus.data;
   layer.alert(JSON.stringify(data));
  }
 };
</script>