哪位大哥帮帮看看哪里出错了,显示不出来
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<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 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;小红:97;小天:76;小张:74;小小:94;小西:90;小伍:76;小迪:64;小曼:76";
var a1 = screStr.split(";");
var sum = 0;
for(var i = 0,i < a1.length,i++){
sum += parseInt(a1.substr(3))
}
document.write(mydate.getFullYear() + "年" + (mydate.getMonth()+1) + "月" + mydate.getDate() + "日" + " " + weekday[mydate.getDay()] + "--班级总分为:" + sum)
</script>
</head>
<body>
</body>
</html>