<!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 currentDate = 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"];
document.write(
currentDate.getFullYear() + "年" +
(currentDate.getMonth() + 1) + "月" +
currentDate.getDate() + "日" + " " +
weekday[currentDate.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 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 sourceArr = sorceStr.split(";");
//document.write(sourceArr);//test
//从数组中将成绩撮出来,然后求和取整,并输出。
var score = new Array();
var sum = 0;
for (var i = 0; i < sourceArr.length; i ++) {
sum += parseInt(sourceArr[i].substr(sourceArr[i].indexOf(":")+1));
//document.write("<br>" + sum);//test
}
document.write("--班级总分为:" + sum);
document.write(",班级平均分为(保留整数):" + Math.round(sum/sourceArr.length))
</script>
</head>
<body>
</body>
可以解释一下从最后中文注释到for语句那里的意思吗,我看不懂
觉得这样比较简洁:
var mydayte=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"];
document.write(mydayte.getFullYear()+"年"+(mydayte.getMonth()+1)+"月"+mydayte.getDate()+"日"+" "+weekday[mydayte.getDay()]+" --班级总分为:"+sum+" 平均分为:"+sum/scoreStr.length);
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 sum=0;
for(var i=0;i<scoreStr.length;i++){
sum+=parseInt(scoreStr[i].substr(scoreStr[i].indexOf(":")+1));
}
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 sourceArr = sorceStr.split(";");//把长的字符串分成(小明:87)这种短的字符串
var score = new Array();//建一个数组,(小明:87)是score【0】
var sum = 0;
for (var i = 0; i < sourceArr.length; i ++) {
sum += parseInt(sourceArr[i].substr(sourceArr[i].indexOf(":")+1));//sourceArr[i].indexOf(“:”)+1求出score[0]的 数值为2+1=3,(sourceArr[0].substr(3) 求出 87