想把分数全输出
<!DOCTYPE HTML>
<html >
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>系好安全带,准备启航</title>
<script type="text/javascript">
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 students = scoreStr.split(";");
for(var i = 0 ; i < students.length ; i++){
var students[i] = students[i].split(":");
document.write(students[i][1] + " ");
}
</script>
</head>
<body>
</body>
</html>
你students已经定义过一次了，for循环中又定义了一次 重复定义一个变量了啊
var aa = scoreStr.split(";");
var sum = 0;
for(var a=0; a<aa.length;a++){
sum = sum + parseInt(aa[a].split(":")[1]);
}