好！！！！！！！！！！！！！！！
<!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 date = 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"];
var y = date.getFullYear();
var m = date.getMonth()+1;
var d = date.getDate();
var w = week[date.getDay()];
if(m>=10){
m = 0+m;
}
if(d>=10){
d = 0+d;
}
document.write(y+"年"+m+"月"+d+"日"+w);
//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 scorearr1 = scoreStr.split(";");
scorearr2 = [];
for(var key in scorearr1){
scorearr2[key] = scorearr1[key].split(":");
}
var sum = 0;
for(var key in scorearr2){
sum += parseInt(scorearr2[key][1]);
}
var ave = Math.ceil(sum/scorearr2.length);
alert(ave);
//从数组中将成绩撮出来，然后求和取整，并输出。
</script>
</head>
<body>
</body>
</html>
