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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 myarr = ["星期日","星期一","星期二","星期三","星期四","星期五","星期六"];
var date = new Date();
document.write(date.getFullYear() + "年" + (date.getMonth()+1) + "月" + date.getDate() + "日\t" + myarr[date.getDay()] + "\t班级总分为:");
//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 myarr1 = new Array();
myarr1 = scoreStr.split(";");
// document.write(myarr1[0].split(":"));
//从数组中将成绩撮出来，然后求和取整，并输出。
var sum = 0;
for(var i = 0; i < myarr1.length; i++) {
var myarr2 = new Array();
myarr2 = myarr1[i].split(":");
sum += parseInt(myarr2[1]);
}
document.write(Math.round(sum/myarr1.length));
</script>
</head>
<body>
</body>
</html>