这样动态的JS文件怎么生成？

像元贝驾考网上用到的题库js文件怎么生成？
html 页面上的代码：
<script src="/exam/km1_kst_C1.js?r=1460486079&km=km1&cx=C1"></script>

其js内容每次进入页面内容不一样，如下：

var dataSource = "";
var dataSource = "数据库";
var ExamCount = 100;
var Exams = new Array(100);
var ExamID = new Array(ExamCount);
var ExamTm = new Array(ExamCount);
var ExamTp = new Array(ExamCount);
var ExamTx = new Array(ExamCount);
var ExamDa = new Array(ExamCount);
var SortID = new Array(ExamCount);
var ExamDaSel = new Array(ExamCount);
var ExamsCnt = '[["数据库xc2016-04-11 17:12:56",200,"km1_kst_c1.js","","","5956"],["4fac5",1,"在这个路口可以掉头。","images/tp_067.jpg","错","1501"],["17d76",1,"遇到这种情况的路段，可以进入网状线区域内停车等候。","images/tp_059.jpg","错","1501"],["d120a",1,"这个标志的含义是告示前方道路有障碍物，车辆左侧绕行。","images/tp_164.jpg","对","1502"],["0f847",1,"在这种急弯道路上行车应交替使用远近光灯。","images/tp_024.jpg","对","1501"],["4e901",1,"驾驶机动车在这种信号灯亮的路口，可以右转弯。","images/tp_097.jpg","对","1502"],["b9c0f",2,"这个标志是何含义？<br/>A、转弯诱导标志<br/>B、线形诱导标志<br/>C、合流诱导标志<br/>D、分流诱导标志","images/tp_260.jpg","B","1502"],["f2097",2,"这个标志是何含义？<br/>A、禁止小型车行驶<br/>B、机动车行驶<br/>C、只准小型车行驶<br/>D、不准小型车通行","images/tp_229.jpg","B","1502"],["ea07d",2,"这个标志是何含义？<br/>A、施工路段<br/>B、事故易发路段<br/>C、减速慢行路段<br/>D、拥堵路段","images/tp_161.jpg","B","1502"],["f5a1d",2,"这个标志预告什么？<br/>A、高速公路服务区预告<br/>B、高速公路避险处预告<br/>C、高速公路客车站预告<br/>D、高速公路停车场预告","images/tp_284.jpg","D","1502"],["6a1bd",2,"这个仪表是何含义？<br/>A、发动机转速表<br/>B、行驶速度表<br/>C、区间里程表<br/>D、百公里油耗表","images/tp_357.jpg","A","1504"]]';
Exams = eval(ExamsCnt);
for (ExmC in Exams) {
    ExamID[ExmC] = Exams[ExmC][0];
    ExamTm[ExmC] = Exams[ExmC][2];
    ExamTp[ExmC] = Exams[ExmC][3];
    ExamTx[ExmC] = Exams[ExmC][1];
    ExamDa[ExmC] = Exams[ExmC][4];
    SortID[ExmC] = Exams[ExmC][5];
    ExamDaSel[ExmC] = "";
}

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