javascript 字符转换为ascii码，ascii码转换为字符

<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>