随机抽取点名(javascript)

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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>随机点名</title>
</head>
<script>

var arr = new Array("小1","小2","小3","小4","小5");

var r = Math.round(Math.random()*(arr.length-1));

document.write("今天值日的是:"+arr[r]);


</script>
<body>
</body>
</html>

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