总是出不来结果，哪位高人帮忙看看错哪了？
<!DOCTYPE HTML>
<html >
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>系好安全带,准备启航</title>
<script type="text/javascript">
//通过javascript的日期对象来得到当前的日期，并输出。
var mydate = new Date();
var myarr = ["星期日","星期一","星期二","星期三","星期四","星期五"，"星期六"]；
document.write(mydate.getFullYear() + "年" + (mydate.getMonth() + 1) + "月" + mydate.getDate() + "日" + " " + myarr[mydate.getDay()] + "<br>");
//成绩是一长窜的字符串不好处理，找规律后分割放到数组里更好操作哦
var scoreStr = "小明:87;小花:81;小红:97;小天:76;小张:74;小小:94;小西:90;小伍:76;小迪:64;小曼:76";
var score = scoreStr.split(;);
// document.write(score+"<br>");
var i = 0;
var sum = 0;
for(i = 0;i < score.length;i++){
sum = sum + parseInt(score[i].slice(-2));
}
var average = Math.round(sum/i);
//从数组中将成绩撮出来，然后求和取整，并输出。
document.write("班级总分为：" + sum + "<br>");
document.write("班级平均分为：" + average);
</script>
</head>
<body>
</body>
</html>
