<!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 now=new Date();
var weekday=["星期日","星期一","星期二","星期三","星期四","星期五","星期六"];
var day=now.getDay();
document.write(weekday[day]);
//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 num = new Array;
num=scoreStr.split(";");
//从数组中将成绩撮出来,然后求和取整,并输出。
for(var i=0;i<2;i++){
var avg=avg+parseInt(num[i].substr(3,2));
}
document.write(avg);
</script>
</head>
<body>
</body>
</html>
var avg在for循环内定义,外面无法调用,在for循环前开始定义avg=0