Ext中ajax调用，显示加载显示

handler:function(){

		    		  me.getEl().mask("获取批复中...");
		    		  Ext.Ajax.request({
		    			  url: '../ZxbShipMentApplyController/obtainApprove.json',method : "POST",success: function(response){
		    				  me.getEl().unmask();
		    				  var text = response.responseText;
		    				  //console.log(text);
		    				  // process server response here
		    				  Ext.Msg.alert("提示！","申请批复成功");
		    			  }
		    		  });
		    	  }