easyui的動態隱藏和顯示datagrid的表頭

1.顯示:

$(".datagrid-header").css("position","static "); 
$(".datagrid-header").css("visibility","visible");

2.隱藏:

$(".datagrid-header").css("position","absolute"); 
$(".datagrid-header").css("visibility","hidden");