想法比较简单哈哈
<!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 date1 = new Date();
var week = ["星期日","星期一","星期二","星期三","星期四","星期五","星期六"];
document.write(
date1.getFullYear()+"年"+
(date1.getMonth()+1)+"月"+
date1.getDate()+"日"+
"   "+
week[date1.getDay()]+"<br/>");
//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 scoreN = scoreStr.split(";");
var sum = 0;
for (var i = 0; i < scoreN.length; i ++){
sum += parseInt(scoreN[i].substring(3))
};
document.write("班级总分为:"+sum+"<br/>");
document.write("班级平均分为:"+Math.round(sum/scoreN.length)+"<br/>");
//从数组中将成绩撮出来,然后求和取整,并输出。
</script>
</head>
<body>
</body>
</html>