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关于base64加密/解密

时间：2021-05-26 08:16:00 | 栏目：JavaScript代码 | 点击：次

尚不支持中文，有待完善。

<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);  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) {   /* 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 sTemp="http://www.cnlei.com";  alert("原文："+sTemp+"\n加密："+base64Encode(sTemp)+"\n解密："+base64Decode(base64Encode(sTemp)));  sTemp="我是枫岩";  alert("原文："+sTemp+"\n加密："+base64Encode(sTemp)+"\n解密："+base64Decode(base64Encode(sTemp)));  </script>

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