将以下代码复制另存为以.html后缀结尾的文件 访问即可测试
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 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 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 |
<!doctype html public "-//w3c//dtd html 4.01 transitional//en" "http://www.w3.org/tr/html4/loose.dtd"> <html> <head> <meta http-equiv="content-type" content="text/html; charset=gb2312"> <title>base64编码加密</title> <script language="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); function base64encode(str) { var out, i, len; var c1, c2, c3; len = str.length; i = 0; out = ""; while (i < len) { c1 = str.charCodeAt(i++) & 0xff; if (i == len) { out += base64encodechars.charAt(c1 >> 2); out += base64encodechars.charAt((c1 & 0x3) << 4); out += "=="; break; } c2 = str.charCodeAt(i++); if (i == len) { out += base64encodechars.charAt(c1 >> 2); out += base64encodechars.charAt(((c1 & 0x3) << 4) | ((c2 & 0xf0) >> 4)); out += base64encodechars.charAt((c2 & 0xf) << 2); out += "="; break; } c3 = str.charCodeAt(i++); out += base64encodechars.charAt(c1 >> 2); out += base64encodechars.charAt(((c1 & 0x3) << 4) | ((c2 & 0xf0) >> 4)); out += base64encodechars.charAt(((c2 & 0xf) << 2) | ((c3 & 0xc0) >> 6)); out += base64encodechars.charAt(c3 & 0x3f); } return out; } function base64decode(str) { var c1, c2, c3, c4; var i, len, out; len = str.length; i = 0; out = ""; while (i < len) { do { c1 = base64decodechars[str.charCodeAt(i++) & 0xff]; } while (i < len && c1 == -1); if (c1 == -1) break; do { c2 = base64decodechars[str.charCodeAt(i++) & 0xff]; } while (i < len && c2 == -1); if (c2 == -1) break; out += String.fromCharCode((c1 << 2) | ((c2 & 0x30) >> 4)); do { c3 = str.charCodeAt(i++) & 0xff; if (c3 == 61) return out; c3 = base64decodechars[c3]; } while (i < len && c3 == -1); if (c3 == -1) break; out += String.fromCharCode(((c2 & 0xf) << 4) | ((c3 & 0x3c) >> 2)); do { c4 = str.charCodeAt(i++) & 0xff; if (c4 == 61) return out; c4 = base64decodechars[c4]; } while (i < len && c4 == -1); if (c4 == -1) break; out += String.fromCharCode(((c3 & 0x03) << 6) | c4); } return out; } function utf16to8(str) { var out, i, len, c; out = ""; len = str.length; for (i = 0; i < len; i++) { c = str.charCodeAt(i); if ((c >= 0x0001) && (c <= 0x007f)) { out += str.charAt(i); } else if (c > 0x07ff) { out += String.fromCharCode(0xe0 | ((c >> 12) & 0x0f)); out += String.fromCharCode(0x80 | ((c >> 6) & 0x3f)); out += String.fromCharCode(0x80 | ((c >> 0) & 0x3f)); } else { out += String.fromCharCode(0xc0 | ((c >> 6) & 0x1f)); out += String.fromCharCode(0x80 | ((c >> 0) & 0x3f)); } } return out; } function utf8to16(str) { var out, i, len, c; var char2, char3; out = ""; len = str.length; i = 0; while (i < len) { c = str.charCodeAt(i++); switch (c >> 4) { case 0: case 1: case 2: case 3: case 4: case 5: case 6: case 7: // 0xxxxxxx out += str.charAt(i - 1); break; case 12: case 13: // 110x xxxx 10xx xxxx char2 = str.charCodeAt(i++); out += String.fromCharCode(((c & 0x1f) << 6) | (char2 & 0x3f)); break; case 14: // 1110 xxxx 10xx xxxx 10xx xxxx char2 = str.charCodeAt(i++); char3 = str.charCodeAt(i++); out += String.fromCharCode(((c & 0x0f) << 12) | ((char2 & 0x3f) << 6) | ((char3 & 0x3f) << 0)); break; } } return out; } function doit() { var f = document.f f.source.value = base64encode(utf16to8(f.source.value)); } function doit2() { var f = document.f f.source.value = utf8to16(base64decode(f.source.value)); } </script> </head> <body style="padding-left:50px;"> <h1 align="center">base64编码加密解密</h1> <form name="f"> 加密或解密的代码 <br> <textarea name="source" rows=22 cols=60 wrap="soft"></textarea><br> <input type=button value="加密" onclick="doit()"><input type=button value="解密" onclick="doit2()"> </form> </body> </html> |
最新评论