javascript base64编码解码
var keyStr = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=";function encode64(input){input = escape(input);var output = "";var chr1, chr2, chr3 = "";var enc1, enc2, enc3, enc4 = "";var i = 0;do{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 if (isNaN(chr3)){enc4 = 64;}output = output +keyStr.charAt(enc1) +keyStr.charAt(enc2) +keyStr.charAt(enc3) +keyStr.charAt(enc4);chr1 = chr2 = chr3 = "";enc1 = enc2 = enc3 = enc4 = "";} while (i < input.length);return output;}function decode64(input){var output = "";var chr1, chr2, chr3 = "";var enc1, enc2, enc3, enc4 = "";var i = 0;// remove all characters that are not A-Z, a-z, 0-9, +, /, or =var base64test = /[^A-Za-z0-9\+\/\=]/g;if (base64test.exec(input)){alert("There were invalid base64 characters in the input text.\n" +"Valid base64 characters are A-Z, a-z, 0-9, '+', '/', and '='\n" +"Expect errors in decoding.");}input = input.replace(/[^A-Za-z0-9\+\/\=]/g, "");do{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 >> 4);chr2 = ((enc2 & 15) << 4) | (enc3 >> 2);chr3 = ((enc3 & 3) << 6) | enc4;output = output + String.fromCharCode(chr1);if (enc3 != 64){output = output + String.fromCharCode(chr2);}if (enc4 != 64){output = output + String.fromCharCode(chr3);}chr1 = chr2 = chr3 = "";enc1 = enc2 = enc3 = enc4 = "";} while (i < input.length);return unescape(output);}document.writeln(encode64("你好啊"));alert(decode64("JXU0RjYwJXU1OTdEJXU1NTRB")); 经测试，还可以。
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