大佬们，我这个随机抽人的小东西。请问抽完了一个人要怎么把这个人，也就是数组对应的元素删掉啊。

防止接下来抽的时候再次抽中该怎么办啊

<!DOCTYPE html>

<html>

<title>jquery随机抽奖</title>

<head>

$(function(){

var alldata = new Array("2.jpg","3.jpg","4.jpg","5.jpg");

var num = alldata.length - 1;

var start = $("#start");

var btn = $("#btn");

var show = $("#show");

var open = false;

function change(){

var randomVal = Math.round(Math.random() * num);

var prizeName = alldata[randomVal];

start.attr("src",prizeName);

}

function run(){

if(!open){

timer=setInterval(change,30);

btn.removeClass('start').addClass('stop').text('停止');

open = true;

}else{

clearInterval(timer);

show.animate({bottom:"50px"},300);

show.animate({bottom:"0px"},300);

btn.removeClass('stop').addClass('start').text('开始抽奖');

open = false;

}

btn.click(function(){run();})

})

</script>

<style>

body{ background:#fff;}

.wrap{ width:300px; margin:100px auto; font-family:"微软雅黑";border: 1px solid red; }

.show{ width:300px; height:300px; background-color:#ff3300; line-height:300px; text-align:center; color:#fff; font-size:28px; -moz-border-radius:150px; -webkit-border-radius:150px; border-radius:150px; background-image: -webkit-gradient(linear,0% 0%, 0% 100%, from(#FF9600), to(#F84000), color-stop(0.5,#fb6c00)); -moz-box-shadow:2px 2px 10px #BBBBBB; -webkit-box-shadow:2px 2px 10px #BBBBBB; box-shadow:2px 2px 10px #BBBBBB;overflow: hidden; position: relative;}

.btn a{ display:block; width:120px; height:50px; margin:30px auto; text-align:center; line-height:50px; text-decoration:none; color:#fff; -moz-border-radius:25px; -webkit-border-radius:25px; border-radius:25px;}

.btn a.start{ background:#80b600;}

.btn a.start:hover{ background:#75a700;}

.btn a.stop{ background:#00a2ff;}

.btn a.stop:hover{ background:#008bdb;}

</style>

</head>

<body>

</div>

</body>

</html>

无节操司机

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