function Base64() { // private property _keyStr = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/="; public method for encoding this.encode = function (input) { var output = ""; var chr1,chr2,chr3,enc1,enc2,enc3,enc4; var i = 0; input = _utf8_encode(input); while (i < input.length) { chr1 = input.charCodeAt(i++); chr2 = input.charCodeAt(i++); chr3 = input.charCodeAt(i++); enc1 = chr1 >> 2; enc2 = ((chr1 & 3) << 4) | (chr2 >> 4); enc3 = ((chr2 & 15) << 2) | (chr3 >> 6); enc4 = chr3 & 63; if (isNaN(chr2)) { enc3 = enc4 = 64; } else (isNaN(chr3)) { enc4 = ; } output = output + _keyStr.charAt(enc1) + _keyStr.charAt(enc2) + _keyStr.charAt(enc3) + _keyStr.charAt(enc4); } return output; }; public method for decoding this.decode = enc1,1)">; input = input.replace(/[^A-Za-z0-9\+\/\=]/g,); input.length) { enc1 = _keyStr.indexOf(input.charAt(i++)); enc2 = _keyStr.indexOf(input.charAt(i++)); enc3 = _keyStr.indexOf(input.charAt(i++)); enc4 = _keyStr.indexOf(input.charAt(i++)); chr1 = (enc1 << 2) | (enc2 >> ); chr2 = ((enc2 & 4) | (enc3 >> ); chr3 = ((enc3 & 6) | enc4; output = output + String.fromCharCode(chr1); if (enc3 != ) { output = output + String.fromCharCode(chr2); } if (enc4 != String.fromCharCode(chr3); } } output = _utf8_decode(output); private method for UTF-8 encoding _utf8_encode = function (string) { string = string.replace(/\r\n/g,1)">\nvar utftext = for (var n = 0; n < string.length; n++) { var c = .charCodeAt(n); if (c < 128) { utftext += String.fromCharCode(c); } if ((c > 127) && (c < 2048)) { utftext += String.fromCharCode((c >> 6) | 192); utftext += String.fromCharCode((c & 63) | ); } else { utftext += String.fromCharCode((c >> 12) | 224); utftext += String.fromCharCode(((c >> 6) & ); } } utftext; }; private method for UTF-8 decoding _utf8_decode = function (utftext) { var string = var c = c1 = c2 = utftext.length) { c = utftext.charCodeAt(i); ) { string += String.fromCharCode(c); i++191) && (c < )) { c2 = utftext.charCodeAt(i + 1); string += String.fromCharCode(((c & 31) << 6) | (c2 & )); i += { c2 = utftext.charCodeAt(i + ); c3 = utftext.charCodeAt(i + 12) | ((c2 & 63) << 6) | (c3 & 3; } } return ; } } 调用和示例显示 base = new Base64(); var str = document.getElementById(p1).innerHTML; str = base.decode(str); 解码 document.getElementById(").innerHTML = str;
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