求大佬看一下錯誤
<!DOCTYPE ?HTML>
<html >
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>系好安全帶,準備啟航</title>
<script type="text/javascript">
? var mydate=new Date();
? var weekday=["星期日","星期一","星期二","星期三","星期四","星期五","星期六"];
? var scoreStr = "小明:87;小花:81;小紅:97;小天:76;小張:74;小小:94;小西:90;小伍:76;小迪:64;小曼:76";
? var abc=scoreStr.split(";");
? var sum=0;
? for(var i=0;i<abc.length-1;i++){
? sum+=parseInt(abc[i].substr(cell[i].indexOf(":")+1));
? }
document.write(mydate.getFullYear()+"年"+mydate.getMonth()+1+"月"+mydate.getDate()+"日"+" ?"+weekday[mydate.getDay()]+"--"+"班級總分為："+sum);
</script>
</head>
<body>
</body>
</html>
2018-07-23