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求問(wèn)為什么均分是nan

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<head>
? ?<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
? ?<title>系好安全帶,準(zhǔn)備啟航</title>

? ?<script type="text/javascript">

? ? ? ?//通過(guò)javascript的日期對(duì)象來(lái)得到當(dāng)前的日期，并輸出。
? ? ? ?var mydate=new Date();
? ? ? ?var myyear=mydate.getFullYear();
? ? ? ?var weekend=new Array();
? ? ? ?weekend=["星期日","星期一","星期二","星期三","星期四","星期五","星期六"];
? ? ? ?var myday=mydate.getDay();
? ? ? ?var mymonth=mydate.getMonth();
? ? ? ?var yuefen=new Array();
? ? ? ?yuefen=["一月","二月","三月","四月","五月","六月","七月","八月","九月","十月","十一月","十二月"];

? ? ? ?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 sum=0;
? ? ? ?var score=new Array();
? ? ? ?for(var i=0;i<=9;i++)
? ? ? ?{
? ? ? ? ? ?score[i]=scoreStr.substr(3*(i+1),2);
? ? ? ? ? ?sum += parseInt(score[i]);
? ? ? ?}
document.write(myyear+"年"+yuefen[mymonth]+weekend[myday]+"--班級(jí)總分為:"+sum)
? ? ? ?//成績(jī)是一長(zhǎng)竄的字符串不好處理，找規(guī)律后分割放到數(shù)組里更好操作哦

? ? ? ?//從數(shù)組中將成績(jī)撮出來(lái)，然后求和取整，并輸出。

? ?</script>
</head>
<body>
</body>
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