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Base64编码解码
/*
收藏的Base64编码/解码。
在一个外国网站看到的,不过对中文不支持。
自己加入了escape,unescape,对中文也支持了。
先用escape()对中文进行编码,然后再进行base64编码。
解码时,再加入unescape()对中文进行解码。
*/
<
html
>
<
head
>
<
title
>
base64 Encoding/Decoding
</
title
>
</
head
>
<
script
type
="text/javascript"
>
<!--
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
;
//
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);
}
//
--></script>
<
body
>
<
form name
=
"
base64Form
"
>
Type
in
the message you want to encode
in
base64, or paste
<
br
>
base64 encoded text into the text field, select Encode or Decode,
<
br
>
and click the button
!<
br
>
<
textarea name
=
"
theText
"
cols
=
"
40
"
rows
=
"
6
"
></
textarea
><
br
>
<
input type
=
"
button
"
name
=
"
encode
"
value
=
"
Encode to base64
"
onClick
=
"
document.base64Form.theText.value=encode64(document.base64Form.theText.value);
"
>
<
input type
=
"
button
"
name
=
"
decode
"
value
=
"
Decode from base64
"
onClick
=
"
document.base64Form.theText.value=decode64(document.base64Form.theText.value);
"
>
</
form
>
</
body
>
</
html
>
引用自:
http://www2.cnblogs.com/vibration/articles/7392.html
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原文地址:https://www.cnblogs.com/xiaodi/p/140409.html
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