Promise調(diào)用then()出錯(cuò)

Vue的項(xiàng)目里

let __this = this;

let pro = function () {
    return new Promise((resolve, reject) => {
        let urlGetCarList = domain + '/app/carStatusList.action';

        __this.$http.get(urlGetCarList, {
            params: {
                'dealerId': 'de590792498f11e7ae8200163e003dce',
                'beginRow': '0',
                'status': '0',
                'isShelves': '1'
            }
        }).then(response => {
            let listArr = response.body.object;
            resolve(listArr.dataList[1].oldCarId);
        });

    });
}



pro.then((id) => {
    console.log(id);
})

listArr.dataList[1].oldCarId打印的確是獲取到的，打印Promise也是有的。
could you please help me, thank you.