为什么没有输出
<!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 mff=["星期日","星期一","星期二","星期三","星期四","星期五","星期六"];
var num=mydate.getDay();
document.write(mydate.getFullYear()+"年"+mydate.getMonth()+"月"+mydate.getDate()+"日"+"星期"+mff[num]);
//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"];
for(var i=0;i<scoreStr.length;i++){
var sum=0;
sum=sum+parseInt(scoreStr[i][1]);
}
document.write(sum);
//从数组中将成绩撮出来，然后求和取整，并输出。
</script>
</head>
<body>
</body>
</html>
