1、https://www.jb51.net/article/43534.htm
<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>
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原文：https://www.cnblogs.com/h5skill/p/9380597.html