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发表于 2018-4-9 18:42:18
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显示全部楼层
广东省深圳市
测试效果
- var keyStr = "ABCDEFGHIJKLMNOP" + "QRSTUVWXYZabcdef" + "ghijklmnopqrstuv" + "wxyz0123456789+/" + "=";
- 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;
- 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);
- }
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