javascript实现抽奖程序的简单实例

var start=1,end=20,luckyList=[],futureList=[];//luckyList表示已获奖的人，futureList表示尚未抽中的人，start,end表示奖券起止编号//先初始化一下所有人员编号的数组for(var i=start;i<=end;i++){futureList.push(i);}//如果刷新了页面，从localStoreage中恢复if(localStorage.getItem("lucky")){luckyList=localStorage.getItem("lucky").split(",");futureList=futureList.filter(function(item){return luckyList.indexOf(item)==-1;})console.log(futureList)}//抽奖函数，每运行一次，产生一个幸运号码function raffle(){var num= Math.random()*futureList.length;num=Math.floor(num);var idx=futureList.indexOf(num);var result= futureList.splice(idx,1)[0].toString();luckyList.push(result);localStorage.setItem("lucky",luckyList);console.log("抽奖结果：",result); } //清除localstorge，如果要复位程序执行此函数function clear(){localStorage.setItem("lucky","");}raffle();