grid 如何重新加载servlet返回的metaData

items:[{
xtype:'button',
text:'清空',
handler: function() {
Ext.getCmp("grid").getStore().removeAll();
var name="0";
Ext.Ajax.request(
{
method : 'POST',
  url:'../InventoryServlet.do',
  params:{
name:name
},
success:function(req){
var metaData=req.responseText;
  
 }
}
)
}
}
]
我将原来grid removeAll()以后 通过条件查询获得下列 metadata
{metaData:{totalProperty:'total',root:'result',fields:['inventoryId','partsId','partsName','inventory','startInventory','minInventory','warehouseId']},total:26,result:[{inventoryId:'10003',partsId:'NGS56665A',partsName:' 车轴',inventory:'300',startInventory:'0',minInventory:'100',warehouseId:'0'},{inventoryId:'10004',partsId:'GSG23666A',partsName:'挡风玻璃',inventory:'50',startInventory:'50',minInventory:'100',warehouseId:'0'},{inventoryId:'10005',partsId:'GFS236665',partsName:'雨刮',inventory:'100',startInventory:'100',minInventory:'500',warehouseId:'0'},{inventoryId:'10008',partsId:'GFS15555G',partsName:'龙骨',inventory:'100',startInventory:'10',minInventory:'10',warehouseId:'0'},{inventoryId:'10010',partsId:'SFS54584A',partsName:'底盘',inventory:'10',startInventory:'10',minInventory:'50',warehouseId:'0'},{inventoryId:'10011',partsId:'SFS54844G',partsName:'化油器',inventory:'50',startInventory:'0',minInventory:'50',warehouseId:'0'},{inventoryId:'10012',partsId:'SFS66548A',partsName:'后视镜',inventory:'100',startInventory:'0',minInventory:'100',warehouseId:'0'},{inventoryId:'10013',partsId:'SFS66548B',partsName:'后视镜',inventory:'500',startInventory:'0',minInventory:'100',warehouseId:'0'}]}
然后怎么讲获得的metadata 重新加载到grid里面显示呢求高手解答，急~·找了一天也没找到答案