编者:解决了对中文的不支持问题.
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);
