<!DOCTYPE html>
<html>
<head lang="en">
<meta charset="UTF-8">
<title>输出26个字母</title>
</head>
<body>
<script>
for (var i = 65; i < 91; i++) {//大写65-90 小写97-122
document.write(String.fromCharCode(i));
//formCharCode,值转换成字母
}
</script>
</body>
</html>
原文：http://www.cnblogs.com/mx2036/p/7099053.html