输出值一直是NAN，还想问一下var scoreArr=scoreStr.split("")，就能使scoreArr变成一个数组吗
<!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">
var nowDate=new Date()
//通过javascript的日期对象来得到当前的日期，并输出。
var weekday=["星期日","星期一","星期二","星期三","星期四","星期五","星期六"];
var month=["1月","2月","3月","4月","5月","6月","7月","8月","9月","10月","11月","12月"]
document.write(nowDate.getFullYear()+"年"+month[nowDate.getMonth()]+nowDate.getDate()+"日"+weekday[nowDate.getDay()]+"--");
//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 scoreArr=scoreStr.split("");
var sum =0;
for(var i=0;i<scoreArr.length;i++)
{
sum = sum + parseInt(scoreArr[i].slice(3));
}
document.write("该班级总分是："+sum+"改班级平均分是："+parseInt(sum/scoreArr.length));
//从数组中将成绩撮出来，然后求和取整，并输出。
</script>
</head>
<body>
</body>
</html>
