layui 表格操作列按钮动态显示的实现方法

<script type="text/html" id="barDemo">
{{# if (d.event_level ==4){}}
 <a class="layui-btn layui-btn-xs layui-btn-danger" lay-event="known"><i class="layui-icon">&#x1005;</i>已知</a>
{{# } else if(d.event_level ==2){ }}
 {{# if(d.event_type_state ==0){ }}
  <a class="layui-btn layui-btn-xs layui-btn-danger" lay-event="known"><i class="layui-icon">&#x1005;</i>已知</a>
 {{# }if(d.event_type_state ==1) { }}
  <a class="layui-btn layui-btn-xs layui-btn-danger" lay-event="process"><i class="layui-icon">&#xe6b2;</i>处理</a>
 {{# } }}
{{# } }}
</script>