callbackname({
    "response": 0,
    "message": "",
    "data": {
        "data": [{
            "id": "39132",
            "uid": "39132",
            "first_date": "2016-03-01",
            "dateline": "2016-12-30",
            "no": 1
        }, {
            "id": "28451",
            "uid": "28451",
            "first_date": "2016-03-01",
            "dateline": "2016-12-30",
            "no": 2
        }],
        "field": {
            "credit": "\u4e2d\u6587\u4e00",
            "equity": "\u4e2d\u6587\u4e8c",
            "hx_yield": "\u4e2d\u6587\u4e09"
        }
    }
});

我想获取json中 dateline 的值，该怎么写