基于javascript的base64加解密

    技术2026-05-19  7

    <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=gb2312" /><title>无标题文档</title><script>function base64decode(str) {  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++) & 0xff]; } while(i < len && c1 == -1); if(c1 == -1)   break; /* c2 */ do {   c2 = base64DecodeChars[str.charCodeAt(i++) & 0xff]; } while(i < len && c2 == -1); if(c2 == -1)   break; out += String.fromCharCode((c1 << 2) | ((c2 & 0x30) >> 4)); /* c3 */ 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)); /* c4 */ 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;}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);var base64EncodeChars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";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;}</script></head>

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