Copy Code code as follows:
/*
* Base64 Code
*/
var base64encodechars = "abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyz0123456789+/";
var base64decodechars = new Array (
-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
-1,-1,-1,-1,-1,-1,-1,-1,-1, 1,-1,,-62, 1,
52, 53, 54, 55, 56, 57, 58, 59, 60, 61,-1,-1,-1,-1,-1,-1,
-1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14,
15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25,-1,-1,-1,-1,-1,
-1, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40,
41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51,-1,-1,-1,-1,-1);
function Base64Encode (str) {
var out, I, Len;
var C1, C2, C3;
len = str.length;
i = 0;
out = "";
while (I < Len) {
C1 = Str.charcodeat (i++) & 0xFF;
if (i = = len)
{
Out + = Base64encodechars.charat (C1 >> 2);
Out + = Base64encodechars.charat ((C1 & 0x3) << 4);
Out + = "= =";
Break
}
C2 = Str.charcodeat (i++);
if (i = = len)
{
Out + = Base64encodechars.charat (C1 >> 2);
Out + + Base64encodechars.charat ((C1 & 0x3) << 4) | ((C2 & 0xF0) >> 4));
Out + = Base64encodechars.charat ((C2 & 0xF) << 2);
Out + = "=";
Break
}
C3 = Str.charcodeat (i++);
Out + = Base64encodechars.charat (C1 >> 2);
Out + + Base64encodechars.charat ((C1 & 0x3) << 4) | ((C2 & 0xF0) >> 4));
Out + + Base64encodechars.charat ((C2 & 0xF) << 2) | ((C3 & 0xc0) >>6));
Out + = Base64encodechars.charat (C3 & 0x3F);
}
return out;
}
function Base64decode (str) {
var C1, C2, C3, C4;
var i, Len, out;
len = str.length;
i = 0;
out = "";
while (I < Len) {
* C1 * *
do {
C1 = Base64decodechars[str.charcodeat (i++) & 0xFF];
while (I < len && C1 = = 1);
if (C1 = = 1)
Break
* C2 * *
do {
C2 = Base64decodechars[str.charcodeat (i++) & 0xFF];
while (i < len && C2 = = 1);
if (C2 = = 1)
Break
Out + + string.fromcharcode (C1 << 2) | ((C2 & 0x30) >> 4));
* C3 * *
do {
C3 = Str.charcodeat (i++) & 0xFF;
if (C3 = 61)
return out;
C3 = Base64decodechars[c3];
while (I < Len && C3 = = 1);
if (C3 = = 1)
Break
Out + + String.fromCharCode ((C2 & 0XF) << 4) | ((C3 & 0x3c) >> 2));
* C4 * *
do {
C4 = str.charcodeat (i++) & 0xFF;
if (C4 = 61)
return out;
C4 = base64decodechars[c4];
while (i < len && C4 = = 1);
if (C4 = = 1)
Break
Out + = String.fromCharCode ((C3 & 0x03) << 6) | c4);
}
return out;
}
function Utf16to8 (str) {
var out, I, Len, C;
out = "";
len = str.length;
for (i = 0; i < len; i++) {
c = str.charcodeat (i);
if ((c >= 0x0001) && (c <= 0x007f)) {
Out + + Str.charat (i);
else if (C > 0x07ff) {
Out + + string.fromcharcode (0xe0 | ((c >>) & 0x0f));
Out + + string.fromcharcode (0x80 | ((c >> 6) & 0x3F));
Out + + string.fromcharcode (0x80 | ((c >> 0) & 0x3F));
} else {
Out + + string.fromcharcode (0xc0 | ((c >> 6) & 0x1F));
Out + + string.fromcharcode (0x80 | ((c >> 0) & 0x3F));
}
}
return out;
}
function Utf8to16 (str) {
var out, I, Len, C;
var char2, Char3;
out = "";
len = str.length;
i = 0;
while (I < Len) {
c = str.charcodeat (i++);
Switch (c >> 4)
{
Case 0:case 1:case 2:case 3:case 4:case 5:case 6:case 7:
0xxxxxxx
Out + = Str.charat (i-1);
Break
Case 12:case 13:
110x xxxx 10xx xxxx
CHAR2 = Str.charcodeat (i++);
Out + + String.fromCharCode ((C & 0x1F) << 6) | (Char2 & 0x3F));
Break
Case 14:
1110 xxxx 10xx xxxx 10xx xxxx
CHAR2 = Str.charcodeat (i++);
CHAR3 = Str.charcodeat (i++);
Out + + String.fromCharCode ((C & 0x0f) << 12) |
((Char2 & 0x3F) << 6) |
((Char3 & 0x3F) << 0));
Break
}
}
return out;
}
/*
* Base64 code end
*/
var m = ' Hello ';
m = Base64Encode (m);
This is an example:
Copy Code code as follows:
<HTML>
<HEAD>
<meta http-equiv= "Content-type" content= "text/html; Charset=utf-8 ">
<title>javascript Base64 demo</title>
<script language=javascript>
/*
* Base64 Code
*/
var base64encodechars = "abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyz0123456789+/";
var base64decodechars = new Array (
-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
-1,-1,-1,-1,-1,-1,-1,-1,-1, 1,-1,,-62, 1,
52, 53, 54, 55, 56, 57, 58, 59, 60, 61,-1,-1,-1,-1,-1,-1,
-1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14,
15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25,-1,-1,-1,-1,-1,
-1, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40,
41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51,-1,-1,-1,-1,-1);
function Base64Encode (str) {
var out, I, Len;
var C1, C2, C3;
len = str.length;
i = 0;
out = "";
while (I < Len) {
C1 = Str.charcodeat (i++) & 0xFF;
if (i = = len)
{
Out + = Base64encodechars.charat (C1 >> 2);
Out + = Base64encodechars.charat ((C1 & 0x3) << 4);
Out + = "= =";
Break
}
C2 = Str.charcodeat (i++);
if (i = = len)
{
Out + = Base64encodechars.charat (C1 >> 2);
Out + + Base64encodechars.charat ((C1 & 0x3) << 4) | ((C2 & 0xF0) >> 4));
Out + = Base64encodechars.charat ((C2 & 0xF) << 2);
Out + = "=";
Break
}
C3 = Str.charcodeat (i++);
Out + = Base64encodechars.charat (C1 >> 2);
Out + + Base64encodechars.charat ((C1 & 0x3) << 4) | ((C2 & 0xF0) >> 4));
Out + + Base64encodechars.charat ((C2 & 0xF) << 2) | ((C3 & 0xc0) >>6));
Out + = Base64encodechars.charat (C3 & 0x3F);
}
return out;
}
function Base64decode (str) {
var C1, C2, C3, C4;
var i, Len, out;
len = str.length;
i = 0;
out = "";
while (I < Len) {
* C1 * *
do {
C1 = Base64decodechars[str.charcodeat (i++) & 0xFF];
while (I < len && C1 = = 1);
if (C1 = = 1)
Break
* C2 * *
do {
C2 = Base64decodechars[str.charcodeat (i++) & 0xFF];
while (i < len && C2 = = 1);
if (C2 = = 1)
Break
Out + + string.fromcharcode (C1 << 2) | ((C2 & 0x30) >> 4));
* C3 * *
do {
C3 = Str.charcodeat (i++) & 0xFF;
if (C3 = 61)
return out;
C3 = Base64decodechars[c3];
while (I < Len && C3 = = 1);
if (C3 = = 1)
Break
Out + + String.fromCharCode ((C2 & 0XF) << 4) | ((C3 & 0x3c) >> 2));
* C4 * *
do {
C4 = str.charcodeat (i++) & 0xFF;
if (C4 = 61)
return out;
C4 = base64decodechars[c4];
while (i < len && C4 = = 1);
if (C4 = = 1)
Break
Out + = String.fromCharCode ((C3 & 0x03) << 6) | c4);
}
return out;
}
function Utf16to8 (str) {
var out, I, Len, C;
out = "";
len = str.length;
for (i = 0; i < len; i++) {
c = str.charcodeat (i);
if ((c >= 0x0001) && (c <= 0x007f)) {
Out + + Str.charat (i);
else if (C > 0x07ff) {
Out + + string.fromcharcode (0xe0 | ((c >>) & 0x0f));
Out + + string.fromcharcode (0x80 | ((c >> 6) & 0x3F));
Out + + string.fromcharcode (0x80 | ((c >> 0) & 0x3F));
} else {
Out + + string.fromcharcode (0xc0 | ((c >> 6) & 0x1F));
Out + + string.fromcharcode (0x80 | ((c >> 0) & 0x3F));
}
}
return out;
}
function Utf8to16 (str) {
var out, I, Len, C;
var char2, Char3;
out = "";
len = str.length;
i = 0;
while (I < Len) {
c = str.charcodeat (i++);
Switch (c >> 4)
{
Case 0:case 1:case 2:case 3:case 4:case 5:case 6:case 7:
0xxxxxxx
Out + = Str.charat (i-1);
Break
Case 12:case 13:
110x xxxx 10xx xxxx
CHAR2 = Str.charcodeat (i++);
Out + + String.fromCharCode ((C & 0x1F) << 6) | (Char2 & 0x3F));
Break
Case 14:
1110 xxxx 10xx xxxx 10xx xxxx
CHAR2 = Str.charcodeat (i++);
CHAR3 = Str.charcodeat (i++);
Out + + String.fromCharCode ((C & 0x0f) << 12) |
((Char2 & 0x3F) << 6) |
((Char3 & 0x3F) << 0));
Break
}
}
return out;
}
/*
* Base64 code end
*/
function doit () {
var f = document.f
F.output.value = Base64Encode (Utf16to8 (F.source.value))
F.decode.value = Utf8to16 (Base64decode (F.output.value))
}
</script>
</HEAD>
<BODY>
<form name= "F" >
Original Code <BR>
<textarea name= "source" rows=4 cols=80 wrap= "soft" ></TEXTAREA><BR><BR>
Base64 encode<br>
<textarea name= "Output" rows=4 cols=80 wrap= "soft" ></TEXTAREA><BR><BR>
Base64 decode<br>
<textarea name= "decode" rows=4 cols=80 wrap= "soft" ></TEXTAREA><BR><BR>
<input Type=button value= "Convert" onclick= "doit ();" >
</FORM>
</BODY>
