<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html> <head> <title>html简单字母数字加密解密实例</title> <meta http-equiv="keywords" content="keyword1,keyword2,keyword3"> <meta http-equiv="description" content="this is my page"> <meta http-equiv="content-type" content="text/html; charset=UTF-8"> <!--<link rel="stylesheet" type="text/css" href="./styles.css">--><script type="text/javascript">var base64EncodeChars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";var base64DecodeChars = new Array( -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 62, -1, -1, -1, 63, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, -1, -1, -1, -1, -1, -1, -1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, -1, -1, -1, -1, -1, -1, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, -1, -1, -1, -1, -1);//测试加密function testEncode(){var str = document.getElementById("psw").value;var out, i, len; var c1, c2, c3; len = str.length; i = 0; out = ""; while (i < len) { c1 = str.charCodeAt(i++) & 255; if (i == len) { out += base64EncodeChars.charAt(c1 >> 2); out += base64EncodeChars.charAt((c1 & 3) << 4); out += "=="; break; } c2 = str.charCodeAt(i++); if (i == len) { out += base64EncodeChars.charAt(c1 >> 2); out += base64EncodeChars.charAt(((c1 & 3) << 4) | ((c2 & 240) >> 4)); out += base64EncodeChars.charAt((c2 & 15) << 2); out += "="; break; } c3 = str.charCodeAt(i++); out += base64EncodeChars.charAt(c1 >> 2); out += base64EncodeChars.charAt(((c1 & 3) << 4) | ((c2 & 240) >> 4)); out += base64EncodeChars.charAt(((c2 & 15) << 2) | ((c3 & 192) >> 6)); out += base64EncodeChars.charAt(c3 & 63); } alert(out); return out;}//测试解密function testDecode(){var str = testEncode();var c1, c2, c3, c4; var i, len, out; len = str.length; i = 0; out = ""; while (i < len) { /* c1 */ do { c1 = base64DecodeChars[str.charCodeAt(i++) & 255]; } while (i < len && c1 == -1); if (c1 == -1) { break; } /* c2 */ do { c2 = base64DecodeChars[str.charCodeAt(i++) & 255]; } while (i < len && c2 == -1); if (c2 == -1) { break; } out += String.fromCharCode((c1 << 2) | ((c2 & 48) >> 4)); /* c3 */ do { c3 = str.charCodeAt(i++) & 255; if (c3 == 61) { return out; } c3 = base64DecodeChars[c3]; } while (i < len && c3 == -1); if (c3 == -1) { break; } out += String.fromCharCode(((c2 & 15) << 4) | ((c3 & 60) >> 2)); /* c4 */ do { c4 = str.charCodeAt(i++) & 255; if (c4 == 61) { return out; } c4 = base64DecodeChars[c4]; } while (i < len && c4 == -1); if (c4 == -1) { break; } out += String.fromCharCode(((c3 & 3) << 6) | c4); } alert(out);}</script> </head> <body> <input type="password" name="psw" id="psw"/> <input type="button" value="加密" onclick="testEncode();"> <input type="button" value="解密" onclick="testDecode();"> </body></html>