作者:火立者 | 来源:互联网 | 2021-08-28 19:51
这几天使用PHP向前端传值的时候,遇到一个问题,要将代码传过去赋值。如果使用urlencode()和urldecode()函数,就会出现js无法解码的情况,因为php和js的相关函数算法不一致。于是准备使用通用的base64加密解密。
base64 加密解密
下方是base64用Javascript写出来的函数和方法。
//1.加密解密方法使用:
//1.加密
var str = '124中文内容';
var base = new Base64();
var result = base.encode(str);
//document.write(result);
//2.解密
var result2 = base.decode(result);
document.write(result2);
//2.加密、解密算法封装:
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 > 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;
}
// public method for decoding
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 > 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;
}
// private method for UTF-8 encoding
_utf8_encode = function (string) {
string = string.replace(/\r\n/g,"\n");
var utftext = "";
for (var n = 0; n 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;
}
// private method for UTF-8 decoding
_utf8_decode = function (utftext) {
var string = "";
var i = 0;
var c = c1 = c2 = 0;
while ( i 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;
}
}
以上所述是小编给大家介绍的Javascript实现base64的加密解密方法,希望对大家有所帮助,如果大家有任何疑问请给我留言,小编会及时回复大家的。在此也非常感谢大家对网站的支持!