交作业了，折腾了半天
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<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 day = 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(day.getFullYear() + "年" + (day.getMonth()+1) + "月" + day.getDate() + "日" + " " + week[day.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";
// 将scoreStr分割成一个数组，放在变量中
var scoreNum = scoreStr.split(";");
//从数组中将成绩撮出来，然后求和取整，并输出。
var summ = 0;
for(i=0; i <scoreNum.length;i++){
var sss = scoreNum[i].split(":");
var aaa = parseInt(sss[1]);
summ = aaa + summ;
}
document.write("班级总分为：" + summ);
</script>
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<body>
</body>
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