for循环问题求助,为什么输出不了呢
<!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">
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 chengji=scorStr.split(";");
for(i=0;i<chengji.length;i++){
document.write(chengji[i]+"<br>");
}
</script>
</head>
<body>
</body>
</html>