var base64 = new Object();
base64.settings = {
char: "+/",
pad: "=",
ascii: false
};
base64.char_set = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789" + base64.settings.char;
base64.encode = function (g) {
var a = "";
var b = "";
for (var d = 0; d < g.length; ++d) {
var c = g.charCodeAt(d);
if (this.settings.ascii) {
if (c >= 256) {
throw "Not an 8-bit char."
}
}
var e = c.toString(2);
while (e.length < (this.settings.ascii ? 8 : 16)) {
e = "0" + e
}
b += e;
while (b.length >= 6) {
var f = b.slice(0, 6);
b = b.slice(6);
a += base64.char_set.charAt(parseInt(f, 2))
}
}
if (b) {
while (b.length < 6) {
b += "0"
}
a += base64.char_set.charAt(parseInt(b, 2))
}
if (this.settings.pad) {
while (a.length % (this.settings.ascii ? 4 : 8) != 0) {
a += this.settings.pad
}
}
return a
};
base64.decode = function (j) {
var c = "";
var b = "";
var k = (this.settings.ascii ? 8 : 16);
for (var f = 0; f < j.length; ++f) {
if (j[f] == this.settings.pad) {
break
}
var a = base64.char_set.indexOf(j.charAt(f));
var h = a.toString(2);
while (h.length < 6) {
h = "0" + h
}
b += h;
while (b.length >= k) {
var g = b.slice(0, k);
b = b.slice(k);
c += String.fromCharCode(parseInt(g, 2))
}
}
var d = c.split("");
var e = "";
for (f = 0; f < d.length; f++) {
if (d[f].charCodeAt(0) > 20) {
e += d[f]
}
}
return e
}; var str = base64.encode("杨秀徐");
alert("base64 encode:" + str); str = base64.decode(str);
alert("base64 decode:" + str);