js实现考试随机选题

考试的时候经常用到，发在这里记录一下
效果图：

代码：

    
    




    
随机选题
    

    
学号
    
姓名
    
题号
    
题目名称
    
    

    

学生数据表：

var student=[];
student[student.length]={no:'201658234069',name:'喜羊羊'};
student[student.length]={no:'201658234050',name:'李二'};
student[student.length]={no:'201658234066',name:'刘蛋蛋'};
student[student.length]={no:'201658234055',name:'李白'};
student[student.length]={no:'201658234056',name:'陆游'};
student[student.length]={no:'201658234057',name:'白居易'};
student[student.length]={no:'201658234058',name:'杜甫'};
student[student.length]={no:'201658234059',name:'李清照'};
student[student.length]={no:'201658234060',name:'苏轼'};
student[student.length]={no:'201658234063',name:'王安石'};
student[student.length]={no:'201658234064',name:'杜牧'};
student[student.length]={no:'201658234065',name:'邱清泉'};
student[student.length]={no:'201658234067',name:'辛弃疾'};
student[student.length]={no:'201658234068',name:'孟浩然'};
student[student.length]={no:'201658234069',name:'杨万里'};
student[student.length]={no:'201658234070',name:'欧阳修'};
student[student.length]={no:'201658234058',name:'范仲淹'};
student[student.length]={no:'201658234059',name:'王维'};
student[student.length]={no:'201658234060',name:'陶渊明'};
student[student.length]={no:'201658234063',name:'诗经'};
student[student.length]={no:'201658234064',name:'黄庭坚'};
student[student.length]={no:'201658234065',name:'屈原'};
student[student.length]={no:'201658234067',name:'司马迁'};
student[student.length]={no:'201658234068',name:'袁枚'};
student[student.length]={no:'201658234069',name:'韩非'};
student[student.length]={no:'201658234070',name:'范成大'};
var topic=[];
topic[topic.length]={no:'1',name:'event测试'};
topic[topic.length]={no:'2',name:'flash动画框架'};
topic[topic.length]={no:'3',name:'仿土豆天气预报'};
topic[topic.length]={no:'4',name:'发微博'};
topic[topic.length]={no:'5',name:'右键菜单'};
topic[topic.length]={no:'6',name:'回车提交留言'};
topic[topic.length]={no:'7',name:'完美运动框架'};
topic[topic.length]={no:'8',name:'延时提示框'};
topic[topic.length]={no:'9',name:'数字时钟'};
topic[topic.length]={no:'10',name:'滚动条'};
topic[topic.length]={no:'11',name:'简易日历'};
topic[topic.length]={no:'12',name:'虚框拖拽'};
topic[topic.length]={no:'13',name:'表单'};
topic[topic.length]={no:'14',name:'运行代码'};
topic[topic.length]={no:'15',name:'键盘事件游戏'};
topic[topic.length]={no:'16',name:'长方形幻灯片'};