重量级接口！！12306火车票接口的使用

火车票接口的使用并不难 最重要的是一个请求的URL的拼接，URL地址如下：

var url = '/otn/leftTicket/query?leftTicketDTO.train_date='+req.body.date+'&leftTicketDTO.from_station='+req.body.start+'&leftTicketDTO.to_station='+req.body.end+'&purpose_codes=ADULT';

还需要给定一些参数，如下：

var options = {
    hostname: 'kyfw.12306.cn',
    port: 443,
    path: url,
    method: 'GET',
    rejectUnauthorized: false
};

然后模拟发送一个请求，就会返回一大堆数据。JSON返回示例：

{
"error_code": "0",
"reason": "Success",
"result": [{
    "train_no": "D2287",
    /*车次*/
    "start_station_name": "上海虹桥",
    /*车次始发站*/
    "end_station_name": "深圳北",
    /*车次终点站*/
    "from_station_name": "上海虹桥",
    /*出发站*/
    "to_station_name": "温州南",
    /*到达站*/
    "start_time": "06:25",
    /*出发时间*/
    "arrive_time": "10:53",
    /*到达时间*/
    "train_class_name": "动车",
    /*车次类型*/
    "day_difference": "0",
    /*历时天数*/
    "lishi": "04:28",
    /*总历时时间*/
    "gr_num": "--",
    /*高级软卧：-- 说明无该席位*/
    "qt_num": "--",
    /*其他*/
    "rw_num": "--",
    /*软卧*/
    "rz_num": "--",
    /*软座*/
    "tz_num": "--",
    /*特等座*/
    "wz_num": "无",
    /*无座*/
    "yw_num": "--",
    /*硬卧*/
    "yz_num": "--",
    /*硬座*/
    "ze_num": "无",
    /*二等座*/
    "zy_num": "无",
    /*一等座*/
    "swz_num": "--"
    /*商务座*/
},
{
    "train_no": "D3203",
    "start_station_name": "上海虹桥",
    "end_station_name": "厦门北",
    "from_station_name": "上海虹桥",
    "to_station_name": "温州南",
    "start_time": "06:30",
    "arrive_time": "11:09",
    "train_class_name": "动车",
    "day_difference": "0",
    "lishi": "04:39",
    "gr_num": "--",
    "qt_num": "--",
    "rw_num": "--",
    "rz_num": "--",
    "tz_num": "--",
    "wz_num": "无",
    "yw_num": "--",
    "yz_num": "--",
    "ze_num": "无",
    "zy_num": "无",
    "swz_num": "--",
    "ticketprice": {
        "OT": [],
        "WZ": "¥226.0",
        "M": "¥335.5",
        "A9": "¥689.0",
        "9": "6890",
        "O": "¥226.0",
        "train_no": "5l000G753722"
    }
},
{
    "train_no": "G7501",
    "start_station_name": "上海虹桥",
    "end_station_name": "苍南",
    "from_station_name": "上海虹桥",
    "to_station_name": "温州南",
    "start_time": "07:00",
    "arrive_time": "11:00",
    "train_class_name": "",
    "day_difference": "0",
    "lishi": "04:00",
    "gr_num": "--",
    "qt_num": "--",
    "rw_num": "--",
    "rz_num": "--",
    "tz_num": "--",
    "wz_num": "165",
    "yw_num": "--",
    "yz_num": "--",
    "ze_num": "无",
    "zy_num": "无",
    "swz_num": "15",
    "ticketprice": {
        "OT": [],
        "WZ": "¥226.0",
        "M": "¥335.5",
        "A9": "¥689.0",
        "9": "6890",
        "O": "¥226.0",
        "train_no": "5l000G753722"
    }
  }]
 }

需要注意的是，站点之间需要用站点编码表示，而不能用中文！所以，需要去网上找编码对应的站点信息。