获取12306余票信息

get12306RemainTicket.js

/**
 * 获取12306余票信息
 * 
 * 查询列车的余票信息
 * GET https://dynamic.12306.cn/otsweb/order/confirmPassengerAction.do?method=getQueueCount&train_date=2013-02-05&train_no=240000D31307&station=D313&from=VNP&to=SHH
 * 
 * URL参数解析
 * train_date // 不用说了吧
 * train_no   // 列车ID, 在余票查询结果车次的span中可以得到
 * station    // 车次
 * from       // 发站CODE 参考: dynamic.12306.cn/otsweb/js/common/station_name.js?version=5.42
 * to         // 到站CODE
 * 
 * 返回数据
 * {"countT":0,"count":116,"ticket":"1*****31794*****00001*****00943*****0001","op_1":true,"op_2":false}
 * op_2=true -> 目前排队人数已经超过余票张数，请您选择其他席别或车次，特此提醒。
 * countT -> 目前排队人数
 * ticket -> 余票信息
 * 
 * @param 同URL参数, 都是必要参数, 外加一个seat参数(席别)
 * 例如:
 * get12306RemainTicket({
 *     train_date: "2013-02-02",
 *     train_no: '240000T1090G',
 *     station: 'T109',
 *     from: 'VNP',
 *     to: 'SHH',
 *     seat: 1
 * });
 */
function get12306RemainTicket(param) {
    var seat = param.seat;
    delete param.seat;
    $.ajax({
        url: 'https://dynamic.12306.cn/otsweb/order/confirmPassengerAction.do?method=getQueueCount', // 必须HTTPS
        type: 'GET',
        data: param,
        dataType: 'json',
        success: function(data) {
            console.log(data);
            console.log(getTicketCountDesc(data.ticket, seat));
        },
        error: function() {
            console.error(arguments);
        }
    });
}

/**
 * 解密12306预订按钮(链接)代表什么含义
 * 解密ypInfoDetail
 * 
 * @author Sun
 * @version 1.0 2013-1-17
 * 
 * @param mark 上面返回数据中的ticket, 也就是ypInfoDetail(查看余票查询结果中预订链接的内容)
 *        mark规律解析
 *        1*****31794*****00001*****00943*****0001按照10个字符串为一组信息, 因此拆分如下
 *        1*****3179
 *        4*****0000
 *        1*****0094
 *        3*****0001
 *        星号前面的第一位为席别, 星号后面的为余票数, 如果这个数字大于3000则表示无座票, 应减去3000后才是真正的余票数
 *        因此总体规律为 -> 席别*****余票数
 * @param seat 席别类型(硬座: 1, 硬卧: 3, 软卧: 4), 在预订页面中获取$("#passenger_1_seat").val()
 * @see dynamic.12306.cn/otsweb/js/order/save_passenger_info.js?version=5.42
 */
function getTicketCountDesc(mark, seat) {
    var ticketCountDesc = "";
    // 本次列车您选择的席别尚有余票94张
    var seatTicket = -1; // 所选席别余票多少张
    // 无座179张
    var withoutSeatTicket = -1; // 无座票多少张

    var i = 0;
    while (i < mark.length) {
        // 1*****3179
        var group = mark.substr(i, 10);
        // 1(席别)
        var seatType = group.substr(0, 1);
        // 1 == 1(硬座)
        if (seatType == seat) {
            // 3179
            var count = group.substr(6, 4);
            while (count.length > 1 && count.substr(0, 1) == "0") { // count为0000的情况, count最终等于0
                count = count.substr(1, count.length);
            }
            // 3179
            count = parseInt(count);
            if (count < 3000) {
                seatTicket = count;
            } else {
                // 179
                withoutSeatTicket = (count - 3000);
            }
        }
        i = i + 10;
    }

    if (seatTicket > -1) {
        ticketCountDesc = '本次列车您选择的席别尚有余票 ' + seatTicket + ' 张';
    }
    if (withoutSeatTicket > -1) {
        ticketCountDesc += ' 无座 ' + withoutSeatTicket + ' 张';
    }
    return ticketCountDesc;
}







/* 以下为参考信息 */
/* ------------------------------------------- */

/**
 * 余票查询中的预订链接
 * 
 * 示例数据: 2013-02-02 北京→上海 D321
 * <a name="btn130_2" class="btn130_2" style="text-decoration:none;" onclick="javascript:getSelected('D321#11:42#21:22#240000D32120#VNP#SHH#09:04#北京南#上海#01#04#O*****01644*****0244O*****3017#57463B183AA6FE5168F52051EF2411B00CBB7D60B8C691B50200094B#P2')">预订</a>
 * @see dynamic.12306.cn/otsweb/js/order/query_common_func.js?version=5.42
 */
function getSelected(selectStr) {
    // 参数格式：#号分隔
    var selectStr_arr = selectStr.split("#");
    var station_train_code=selectStr_arr[0];
    var lishi=selectStr_arr[1];
    var starttime=selectStr_arr[2];
    var trainno=selectStr_arr[3];
    var from_station_telecode=selectStr_arr[4];
    var to_station_telecode=selectStr_arr[5];
    var arrive_time=selectStr_arr[6];
    var from_station_name=selectStr_arr[7];
    var to_station_name=selectStr_arr[8];
    var from_station_no=selectStr_arr[9];
    var to_station_no=selectStr_arr[10];
    var ypInfoDetail=selectStr_arr[11];
    var mmStr = selectStr_arr[12];
    var locationCode = selectStr_arr[13];

//    参数值说明
//    ----------
//     1. station_train_code    // 车次(D321)
//     2. lishi                 // 历时(11:42)
//     3. starttime             // 发车时间(21:22)
//     4. trainno               // 列车ID(240000D32120), 可以从查询数据的table中获得该信息<span onmouseover="onStopHover('240000D32120#VNP#SHH')" id="id_240000D32120">D321</span>
//     5. from_station_telecode // 发站CODE(VNP)
//     6. to_station_telecode   // 到站CODE(SHH)
//     7. arrive_time           // 到站时间(09:04)
//     8. from_station_name     // 发站名(北京南)
//     9. to_station_name       // 到站名(上海)
//    10. from_station_no       // 发站序号(该趟列车路线上的序号)(01)
//    11. to_station_no         // 到站序号(该趟列车路线上的序号)(04)
//    12. ypInfoDetail          // yp -> 余票(O*****01644*****0244O*****3017), 在预订页面left_ticket会补全星号O1234501644123450244O123453017, 可以认为这就代表票的ID, 具体含义请参考getTicketCountDesc
//    13. mmStr                 // token(57463B183AA6FE5168F52051EF2411B00CBB7D60B8C691B50200094B)
//    14. locationCode          // TODO 随车次变化, 猜测是此趟车的到站CODE(P2)

    var flag = true;
    if (checkBeyondMixTicketNum()) {
        flag = false;
        return;
    }
    if (flag) {
        submitRequest(station_train_code,lishi,starttime,trainno,from_station_telecode,to_station_telecode,arrive_time,from_station_name,to_station_name,from_station_no,to_station_no,ypInfoDetail,mmStr,locationCode);
    }
}

/**
 * 请求预订
 * 
 * @see dynamic.12306.cn/otsweb/js/order/query_common_bind.js?version=5.42
 */
function submitRequest(station_train_code,lishi,starttime,trainno,from_station_telecode,to_station_telecode,arrive_time,from_station_name,to_station_name,from_station_no,to_station_no,ypInfoDetail,mmStr,locationCode) {
    $('#station_train_code').val(station_train_code);
    $('#lishi').val(lishi);
    $('#train_start_time').val(starttime);
    $('#trainno').val(trainno);
    $('#from_station_telecode').val(from_station_telecode);
    $('#to_station_telecode').val(to_station_telecode);
    $('#arrive_time').val(arrive_time);
    $('#from_station_name').val(from_station_name);
    $('#to_station_name').val(to_station_name);
    $('#from_station_no').val(from_station_no);
    $('#to_station_no').val(to_station_no);
    $('#ypInfoDetail').val(ypInfoDetail);
    $('#mmStr').val(mmStr);
    $('#locationCode').val(locationCode);
    // ctx = '/otsweb'
    $('#orderForm').attr("action",
            ctx+"/order/querySingleAction.do?method=submutOrderRequest");
    $('#orderForm').submit();
}

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