css怎样将base64编码转为字体

Posted 2023-02-14

参考技术A js能写方法，css就不知道了
js的方法：
var Base64 =

// private property
_keyStr : "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=",

// public method for encoding
encode : function (input)
var output = "";
var chr1, chr2, chr3, enc1, enc2, enc3, enc4;
var i = 0;

input = Base64._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 +
this._keyStr.charAt(enc1) + this._keyStr.charAt(enc2) +
this._keyStr.charAt(enc3) + this._keyStr.charAt(enc4);



return output;
,

// public method for decoding
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 = this._keyStr.indexOf(input.charAt(i++));
enc2 = this._keyStr.indexOf(input.charAt(i++));
enc3 = this._keyStr.indexOf(input.charAt(i++));
enc4 = this._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 = Base64._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 < 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;
,

// private method for UTF-8 decoding
_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;