加载层：

var loadIndex = layer.msg('加载中', {
        icon: 16,
        shade: 0.5,
        time:3600 * 1000,
      });;

弹出界面：

  layer.open({
                title:txt,
                area: ['550px', '280px'],  
                type: 1,
                //title: false,
                closeBtn: 1,
                shadeClose: true,  
                move:false,                           
                content: $("#exportqu") ,
            });