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<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 D = new Date();
var myyear = D.getFullYear();
var mymonth = D.getMonth() + 1;
var mydate = D.getDate();
var day = ["日","一","二","三","四","五","六"];
var myday = D.getDay();
document.write(myyear + "年" + mymonth + "月" + mydate + "日"
+ "星期" + day[myday] + "</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 sorceStr = "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 arr1 = sorceStr.split(";")
document.write("班级成绩：" + "</br>" + arr1 + "</br>" + "班级总分为：" + "</br>")
//从数组中将成绩撮出来，然后求和取整，并输出。
sum = 0; //请问这里为什么要 “sum = 0”？
for (i=0; i<arr1.length; i++){
var sum = parseInt(arr1[i].substr(3)) + sum
};
ave = sum/arr1.length
document.write(sum + "</br>" + "班级平均分为：" + "</br>" + Math.round(ave));
</script>
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<body>
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