js域问题

var detail=true;

    	var conn = new Ext.data.Connection({

				method: 'POST',

				url: 'SysCfg'

			});

		conn.request({

			success: function(response) {

				var data = Ext.util.JSON.decode(response.responseText);

				detail=data.properties[0].detail;

				alert(detail+"111");

			},

			failure: function(response) {

				Ext.MessageBox.hide();

				Ext.Msg.show({title: '错误', msg: response.statusText, buttons: Ext.Msg.OK, icon: Ext.MessageBox.ERROR});

			}

		});

    	alert(detail);