核心：js的Math对象和Array对象
<!DOCTYPE html>
<html lang=en>
<head>
<meta charset=UTF-8>
<title>random</title>
<style>
#awardListDom{width: 100%;}
</style>
</head>
<body>
<label for=awardListDom>奖项列表</label><br>
<input type=text value= id=awardListDom> <br>
<label for=num>抽到的奖</label>
