for(var key in jsona.data) {

					alert("对应的值是:" + jsona.data[key].fromName);

				}

var jsona = {

					"data": {

						"李梅_7": {

							"fromId": 7,

							"toId": 68,

							"fromName": "李梅",

							"count": 2,

							"groupId": null,

							"groupName": null,

							"type": 0

						},

						"gisnew_67": {

							"fromId": 67,

							"toId": 68,

							"fromName": "gisnew",

							"count": 1,

							"groupId": null,

							"groupName": null,

							"type": 0

						}

					},

					"code": 1,

					"msg": "获取新消息成功！"

				}