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每天面对着电脑屏幕，敲打键盘。我所面对的并不只是代码，而是一种生活方式。0(回)
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859天前<!doctype html public "-//w3c//dtd html 4.01 transitional//en" "http://www.w3.org/tr/html4/loose.dtd"> |
<html> |
<head> |
<meta http-equiv="content-type" content="text/html; charset=gb2312"> |
<title>base64编码加密解密</title> |
<script language="javascript"> |
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, -1, -1, 63, |
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) { |
|
do { |
c1 = base64decodechars[str.charCodeAt(i++) & 0xff]; |
} while (i < len && c1 == -1); |
if (c1 == -1) |
break; |
|
do { |
c2 = base64decodechars[str.charCodeAt(i++) & 0xff]; |
} while (i < len && c2 == -1); |
if (c2 == -1) |
break; |
out += String.fromCharCode((c1 << 2) | ((c2 & 0x30) >> 4)); |
|
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)); |
|
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 >> 12) & 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; |
} |
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 style="padding-left:50px;"> |
<h1 align="center">base64编码加密解密</h1> |
<form name="f"> |
原码<br> |
<textarea name="source" rows=4 cols=60 wrap="soft"></textarea> |
<br> |
<br> |
base64 encode<br> |
<textarea name="output" rows=4 cols=60 wrap="soft"></textarea> |
<br> |
<br> |
base64 decode<br> |
<textarea name="decode" rows=4 cols=60 wrap="soft"></textarea> |
<br> |
<br> |
<input type=button value="转换" onClick="doit()"> |
</form> |
</body> |
</html> |
