js中的数组操作

<!DOCTYPE  HTML>
<html >
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>字符串综合应用</title>

<script type="text/javascript">
 var scoreStr = "小明:87;小花:801;小红:907;小天:76;小张:74;小小:94;小西:90;小伍:76;小迪:64;小曼:76";

 //split()分割字符串 
var a = scoreStr.split(";");

document.write(a);
    var s = new Array();
    var sum = 0;
    for(var i = 0; i < a.length; i++){
//substring()提取字符串中介于两个指定下标之间的字符;
//indexOf()返回某个指定的字符串值在字符串中首次出现的位置;
        s[i] = parseInt(a[i].substring(a[i].indexOf(":") + 1));
        sum += s[i];
    }
document.write("</br>"+s);
    document.write("</br>"+"平均数为:" + sum / a.length + "分");
</script>
</head>
<body>
</body>
</html>

posted on 2017-08-08 17:16 calamus 阅读(146) 评论(0) 编辑收藏举报