风中的遗憾憾
2015-12-12 11:47
<!DOCTYPE HTML>
<html >
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>数组拆分</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 myday=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(myday.getFullYear()+"年"+myday.getMonth()+"月"+myday.getDate()+"日"+" "+weekday[myday.getDay()]+"<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 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 myarr=scoreStr.split(";");
var sum=0;
for(i=0;i<=myarr.length;i++)
{
var sum1=parseInt(myarr[i].substr(3,2));
sum+=sum1;
document.write(sum+"<br>");
}
var mean=sum/myarr.length;
document.write(mean);
//从数组中将成绩撮出来,然后求和取整,并输出。
</script>
</head>
<body>
</body>
</html>
你的问题是;i<=myarr.length 别用 <= 用<
<!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 myDate = new Date(); var weekDays = ["星期日","星期一","星期二","星期三","星期四","星期五","星期六"] document.write(myDate.getFullYear() + "年" + myDate.getMonth() + "月" + myDate.getDay() + "日" + weekDays[myDate.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 scoreArr = sorceStr.split(";"); //从数组中将成绩撮出来,然后求和取整,并输出。 var sum = 0; var avg = 0; for (var i = 0; i < scoreArr.length; i++) { sum = sum + parseInt(scoreArr[i].slice(3,5)); document.write("<br/>"+parseInt(sum)); } avg = sum / scoreArr.length; document.write("<br/>"+parseInt(avg)); </script> </head> <body> </body> </html>
对数组操作别用substr
JavaScript进阶篇
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