base64加密
base64.js文件:
1 function Base64() { 2 var _keyStr = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/="; 3 this.encode = function(input) { 4 var output = ""; 5 var chr1, chr2, chr3, enc1, enc2, enc3, enc4; 6 var i = 0; 7 input = _utf8_encode(input); 8 while (i < input.length) { 9 chr1 = input.charCodeAt(i++); 10 chr2 = input.charCodeAt(i++); 11 chr3 = input.charCodeAt(i++); 12 enc1 = chr1 >> 2; 13 enc2 = ((chr1 & 3) << 4) | (chr2 >> 4); 14 enc3 = ((chr2 & 15) << 2) | (chr3 >> 6); 15 enc4 = chr3 & 63; 16 if (isNaN(chr2)) { 17 enc3 = enc4 = 64; 18 } else if (isNaN(chr3)) { 19 enc4 = 64; 20 } 21 output = output + 22 _keyStr.charAt(enc1) + _keyStr.charAt(enc2) + 23 _keyStr.charAt(enc3) + _keyStr.charAt(enc4); 24 } 25 return output; 26 } 27 this.decode = function(input) { 28 var output = ""; 29 var chr1, chr2, chr3; 30 var enc1, enc2, enc3, enc4; 31 var i = 0; 32 input = input.replace(/[^A-Za-z0-9\+\/\=]/g, ""); 33 while (i < input.length) { 34 enc1 = _keyStr.indexOf(input.charAt(i++)); 35 enc2 = _keyStr.indexOf(input.charAt(i++)); 36 enc3 = _keyStr.indexOf(input.charAt(i++)); 37 enc4 = _keyStr.indexOf(input.charAt(i++)); 38 chr1 = (enc1 << 2) | (enc2 >> 4); 39 chr2 = ((enc2 & 15) << 4) | (enc3 >> 2); 40 chr3 = ((enc3 & 3) << 6) | enc4; 41 output = output + String.fromCharCode(chr1); 42 if (enc3 != 64) { 43 output = output + String.fromCharCode(chr2); 44 } 45 if (enc4 != 64) { 46 output = output + String.fromCharCode(chr3); 47 } 48 } 49 output = _utf8_decode(output); 50 return output; 51 } 52 var _utf8_encode = function(string) { 53 string = string.replace(/\r\n/g, "\n"); 54 var utftext = ""; 55 for (var n = 0; n < string.length; n++) { 56 var c = string.charCodeAt(n); 57 if (c < 128) { 58 utftext += String.fromCharCode(c); 59 } else if ((c > 127) && (c < 2048)) { 60 utftext += String.fromCharCode((c >> 6) | 192); 61 utftext += String.fromCharCode((c & 63) | 128); 62 } else { 63 utftext += String.fromCharCode((c >> 12) | 224); 64 utftext += String.fromCharCode(((c >> 6) & 63) | 128); 65 utftext += String.fromCharCode((c & 63) | 128); 66 } 67 } 68 return utftext; 69 } 70 var _utf8_decode = function(utftext) { 71 var string = ""; 72 var i = 0; 73 var c = c1 = c2 = 0; 74 while (i < utftext.length) { 75 c = utftext.charCodeAt(i); 76 if (c < 128) { 77 string += String.fromCharCode(c); 78 i++; 79 } else if ((c > 191) && (c < 224)) { 80 c2 = utftext.charCodeAt(i + 1); 81 string += String.fromCharCode(((c & 31) << 6) | (c2 & 63)); 82 i += 2; 83 } else { 84 c2 = utftext.charCodeAt(i + 1); 85 c3 = utftext.charCodeAt(i + 2); 86 string += String.fromCharCode(((c & 15) << 12) | ((c2 & 63) << 6) | (c3 & 63)); 87 i += 3; 88 } 89 } 90 return string; 91 } 92 }
应用
1 <!DOCTYPE html> 2 <html lang="en"> 3 4 <head> 5 <meta charset="UTF-8"> 6 <meta name="viewport" content="width=device-width, initial-scale=1.0"> 7 <title>加密</title> 8 <script src="./base64.js"></script> 9 </head> 10 11 <body> 12 <script> 13 var passWord = "poi~~"; 14 let b = new Base64().encode(passWord); 15 console.log(b) 16 </script> 17 </body> 18 19 </html>
打印结果:
function Base64() {
var _keyStr = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=";
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 if (isNaN(chr3)) {
enc4 = 64;
}
output = output +
_keyStr.charAt(enc1) + _keyStr.charAt(enc2) +
_keyStr.charAt(enc3) + _keyStr.charAt(enc4);
}
return output;
}
this.decode = function(input) {
var output = "";
var chr1, chr2, chr3;
var enc1, enc2, enc3, enc4;
var i = 0;
input = input.replace(/[^A-Za-z0-9\+\/\=]/g, "");
while (i < 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 >> 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);
}
}
output = _utf8_decode(output);
return output;
}
var _utf8_encode = function(string) {
string = string.replace(/\r\n/g, "\n");
var utftext = "";
for (var n = 0; n < string.length; n++) {
var c = string.charCodeAt(n);
if (c < 128) {
utftext += String.fromCharCode(c);
} else if ((c > 127) && (c < 2048)) {
utftext += String.fromCharCode((c >> 6) | 192);
utftext += String.fromCharCode((c & 63) | 128);
} else {
utftext += String.fromCharCode((c >> 12) | 224);
utftext += String.fromCharCode(((c >> 6) & 63) | 128);
utftext += String.fromCharCode((c & 63) | 128);
}
}
return utftext;
}
var _utf8_decode = function(utftext) {
var string = "";
var i = 0;
var c = c1 = c2 = 0;
while (i < utftext.length) {
c = utftext.charCodeAt(i);
if (c < 128) {
string += String.fromCharCode(c);
i++;
} else if ((c > 191) && (c < 224)) {
c2 = utftext.charCodeAt(i + 1);
string += String.fromCharCode(((c & 31) << 6) | (c2 & 63));
i += 2;
} else {
c2 = utftext.charCodeAt(i + 1);
c3 = utftext.charCodeAt(i + 2);
string += String.fromCharCode(((c & 15) << 12) | ((c2 & 63) << 6) | (c3 & 63));
i += 3;
}
}
return string;
}
}