js ?base64加密解密

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;}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 CharToHex(str) { ???var out, i, len, c, h; ???out = ""; ???len = str.length; ???i = 0; ???while(i < len) ????{ ???????c = str.charCodeAt(i++); ???????h = c.toString(16); ???????if(h.length < 2) ???????????h = "0" + h; ???????????????out += "\\x" + h + " "; ???????if(i > 0 && i % 8 == 0) ???????????out += "\r\n"; ???} ???return out;}function doEncode() { ???var src = document.getElementById(‘src‘).value; ???document.getElementById(‘dest‘).value = base64encode(utf16to8(src)); ???//调用这里加密}function doDecode() { ???var src = document.getElementById(‘src‘).value; ???var opts = document.getElementById(‘opt‘); ???if(opts.checked) ???{ ???????document.getElementById(‘dest‘).value = CharToHex(base64decode(src)); ??//调用这里解密 ???} ???else ???{ ???????document.getElementById(‘dest‘).value = utf8to16(base64decode(src)); ???}}//window.BASE64 = __BASE64; ?function ss(){ ???return ‘1231‘;}