javascript 字符轉換為ascii碼，ascii碼轉換為字符

<script>
str="A";
code = str.charCodeAt();
str2 = String.fromCharCode(code);
str3 = String.fromCharCode(0x60+26);

document.write(code+'<br />');
document.write(str2+'<br />');
document.write(str3);
</script>