各位朋友,js中有没有类似java sun.misc.BASE64Decoder的Base64转字节数组的方式？
if (!Shotgun)
var Shotgun = {};
if (!Shotgun.Js)
Shotgun.Js = {};
Shotgun.Js.Base64 = {
_table: [
'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P',
'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z', 'a', 'b', 'c', 'd', 'e', 'f',
'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v',
'w', 'x', 'y', 'z', '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '+', '/'
],
encode: function (bin) {
var codes = [];
var un = 0;
un = bin.length % 3;
if (un == 1)
bin.push(0, 0);
else if (un == 2)
bin.push(0);
for (var i = 2; i < bin.length; i += 3) {
var c = bin[i - 2] << 16;
c |= bin[i - 1] << 8;
c |= bin[i];
codes.push(this._table[c >> 18 & 0x3f]);
codes.push(this._table[c >> 12 & 0x3f]);
codes.push(this._table[c >> 6 & 0x3f]);
codes.push(this._table[c & 0x3f]);
}
if (un >= 1) {
codes[codes.length - 1] = "=";
bin.pop();
}
if (un == 1) {
codes[codes.length - 2] = "=";
bin.pop();
}
return codes.join("");
},
decode: function (base64Str) {
var i = 0;
var bin = [];
var x = 0, code = 0, eq = 0;
while (i < base64Str.length) {
var c = base64Str.charAt(i++);
var idx = this._table.indexOf(c);
if (idx == -1) {
switch (c) {
case '=': idx = 0; eq++; break;
case ' ':
case '\n':
case "\r":
case '\t':
continue;
default:
throw { "message": "\u0062\u0061\u0073\u0065\u0036\u0034\u002E\u0074\u0068\u0065\u002D\u0078\u002E\u0063\u006E\u0020\u0045\u0072\u0072\u006F\u0072\u003A\u65E0\u6548\u7F16\u7801\uFF1A" + c };
}
}
if (eq > 0 && idx != 0)
throw { "message": "\u0062\u0061\u0073\u0065\u0036\u0034\u002E\u0074\u0068\u0065\u002D\u0078\u002E\u0063\u006E\u0020\u0045\u0072\u0072\u006F\u0072\u003A\u7F16\u7801\u683C\u5F0F\u9519\u8BEF\uFF01" };
code = code << 6 | idx;
if (++x != 4)
continue;
bin.push(code >> 16);
bin.push(code >> 8 & 0xff);
bin.push(code & 0xff)
code = x = 0;
}
if (code != 0)
throw { "message": "\u0062\u0061\u0073\u0065\u0036\u0034\u002E\u0074\u0068\u0065\u002D\u0078\u002E\u0063\u006E\u0020\u0045\u0072\u0072\u006F\u0072\u003A\u7F16\u7801\u6570\u636E\u957F\u5EA6\u9519\u8BEF" };
if (eq == 1)
bin.pop();
else if (eq == 2) {
bin.pop();
bin.pop();
} else if (eq > 2)
throw { "message": "\u0062\u0061\u0073\u0065\u0036\u0034\u002E\u0074\u0068\u0065\u002D\u0078\u002E\u0063\u006E\u0020\u0045\u0072\u0072\u006F\u0072\u003A\u7F16\u7801\u683C\u5F0F\u9519\u8BEF\uFF01" };
for (var i=0;i<bin.length;i++){
if (bin[i]>=128){
bin[i]=bin[i]-256;
}
}
return bin;
}
};
有的，你是要截图吗？还是做别的操作。
window.btoa 和atob
//字符串转byte[]
function str2Bytes(str) {
var ch, stack, result = [];
for (var i = 0, len = str.length; i < len; i++) {
ch = str.charCodeAt(i);
stack = [];
do {
if (ch >= 0x010000 && ch <= 0x10FFFF) {
stack.push(((ch >> 18) & 0x07) | 0xF0);
stack.push(((ch >> 12) & 0x3F) | 0x80);
stack.push(((ch >> 6) & 0x3F) | 0x80);
stack.push((ch & 0x3F) | 0x80);
} else if (ch >= 0x000800 && ch <= 0x00FFFF) {
stack.push(((ch >> 12) & 0x0F) | 0xE0);
stack.push(((ch >> 6) & 0x3F) | 0x80);
stack.push((ch & 0x3F) | 0x80);
} else if (ch >= 0x000080 && ch <= 0x0007FF) {
stack.push(((ch >> 6) & 0x1F) | 0xC0);
stack.push((ch & 0x3F) | 0x80);
} else {
stack.push(ch & 0xFF);
}
ch = ch >> 8;
} while (ch);
result = result.concat(stack.reverse());
}
return result;
}
//byte[]转string
function bytes2Str(_arr) {
var str = '';
//字节序列转ASCII码
//[0x24, 0x26, 0x28, 0x2A] ==> "$&C*"
for (var i = 0, len = _arr.length; i < len; i++) {
var one = _arr[i].toString(2),
v = one.match(/^1+?(?=0)/);
if (v && one.length == 8) {
var bytesLength = v[0].length;
var store = _arr[i].toString(2).slice(7 - bytesLength);
for (var st = 1; st < bytesLength; st++) {
store += _arr[st + i].toString(2).slice(2);
}
str += String.fromCharCode(parseInt(store, 2));
i += bytesLength - 1;
} else {
str += String.fromCharCode(_arr[i]);
}
}
return str;
}
//int转byte
function int2Byte(i) {
var b = i & 0xFF; //[0-255]
var c = 0;
if (b >= 0x80) {
c = b % 0x80;
c = -1 * (0x80 - c);
} else {
c = b;
}
return c;
}
//字符串转byte[]
function str2Bytes(str) {
var ch, stack, result = [];
for (var i = 0, len = str.length; i < len; i++) {
ch = str.charCodeAt(i);
stack = [];
if (ch >= 0x010000 && ch <= 0x10FFFF) {
stack.push(int2Byte(((ch >> 18) & 0x07) | 0xF0));
stack.push(int2Byte(((ch >> 12) & 0x3F) | 0x80));
stack.push(int2Byte(((ch >> 6) & 0x3F) | 0x80));
stack.push(int2Byte((ch & 0x3F) | 0x80));
} else if (ch >= 0x000800 && ch <= 0x00FFFF) {
stack.push(int2Byte(((ch >> 12) & 0x0F) | 0xE0));
stack.push(int2Byte(((ch >> 6) & 0x3F) | 0x80));
stack.push(int2Byte((ch & 0x3F) | 0x80));
} else if (ch >= 0x000080 && ch <= 0x0007FF) {
stack.push(int2Byte(((ch >> 6) & 0x1F) | 0xC0));
stack.push(int2Byte((ch & 0x3F) | 0x80));
} else {
stack.push(ch & 0xFF);
}
result = result.concat(stack);
}
return result;
}
//byte[]转string
function bytes2Str(_arr) {
var unicodeStr = '';
for (var pos = 0, len = _arr.length; pos < len;) {
var flag = _arr[pos];
var unicode = 0;
if ((flag >>> 7) === 0) {
unicodeStr += String.fromCharCode(_arr[pos]);
pos += 1;
} else if ((flag & 0xF0) === 0xF0) {
unicode = (_arr[pos] & 0xF) << 18;
unicode |= (_arr[pos + 1] & 0x3F) << 12;
unicode |= (_arr[pos + 2] & 0x3F) << 6;
unicode |= (_arr[pos + 3] & 0x3F);
unicodeStr += String.fromCodePoint(unicode);
pos += 4;
} else if ((flag & 0xE0) === 0xE0) {
unicode = (_arr[pos] & 0x1F) << 12;;
unicode |= (_arr[pos + 1] & 0x3F) << 6;
unicode |= (_arr[pos + 2] & 0x3F);
unicodeStr += String.fromCharCode(unicode);
pos += 3;
} else if ((flag & 0xC0) === 0xC0) {
unicode = (_arr[pos] & 0x3F) << 6;
unicode |= (_arr[pos + 1] & 0x3F);
unicodeStr += String.fromCharCode(unicode);
pos += 2;
} else {
unicodeStr += String.fromCharCode(_arr[pos]);
pos += 1;
}
}
return unicodeStr;
}
var toBase64 = [
'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M',
'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z',
'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm',
'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z',
'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '+', '/'
];
var fromBase64 = new Array();
for (var i = 0, len = 256; i < len; i++) {
fromBase64[i] = -1;
}
for (var j = 0; j < toBase64.length; j++) {
fromBase64[toBase64[j].charCodeAt(0)] = j;
}
fromBase64['='.charCodeAt(0)] = -2;
//base64编码 string return byte[]
function encodeBase64(src) {
src = src || '';
var bsrc = str2Bytes(src);
var end = bsrc.length;
var off = 0;
var dst = [];
var base64 = [];
for (var i = 0, len = toBase64.length; i < len; i++) {
base64[i] = toBase64[i].charCodeAt(0);
}
var sp = off;
var slen = Math.trunc((end - off) / 3) * 3;
var sl = off + slen;
var dp = 0;
while (sp < sl) {
var sl0 = Math.min(sp + slen, sl);
for (var sp0 = sp, dp0 = dp; sp0 < sl0;) {
var bits = (bsrc[sp0++] & 0xff) << 16 | (bsrc[sp0++] & 0xff) << 8 | (bsrc[sp0++] & 0xff);
dst[dp0++] = int2Byte(base64[(bits >>> 18) & 0x3f]);
dst[dp0++] = int2Byte(base64[(bits >>> 12) & 0x3f]);
dst[dp0++] = int2Byte(base64[(bits >>> 6) & 0x3f]);
dst[dp0++] = int2Byte(base64[bits & 0x3f]);
}
var dlen = (sl0 - sp) / 3 * 4;
dp += dlen;
sp = sl0;
}
if (sp < end) {
var b0 = bsrc[sp++] & 0xff;
dst[dp++] = int2Byte(base64[b0 >> 2]);
if (sp == end) {
dst[dp++] = int2Byte(base64[(b0 << 4) & 0x3f]);
dst[dp++] = '='.charCodeAt(0);
dst[dp++] = '='.charCodeAt(0);
} else {
var b1 = bsrc[sp++] & 0xff;
dst[dp++] = int2Byte(base64[(b0 << 4) & 0x3f | (b1 >> 4)]);
dst[dp++] = int2Byte(base64[(b1 << 2) & 0x3f]);
dst[dp++] = '='.charCodeAt(0);
}
}
return dst;
}
//base64解码 string return byte[]
function decodeBase64(src) {
src = (src || '').replace(/[^A-z0-9+/]/g, '');
var bsrc = str2Bytes(src);
var sl = bsrc.length;
var sp = 0;
var dst = [];
var base64 = fromBase64;
var dp = 0;
var bits = 0;
var shiftto = 18;
while (sl > sp) {
var b = bsrc[sp++] & 0xff;
if ((b = base64[b]) < 0) {
if (b == -2) {
break;
}
}
bits |= (b << shiftto);
shiftto -= 6;
if (shiftto < 0) {
dst[dp++] = int2Byte(bits >> 16);
dst[dp++] = int2Byte(bits >> 8);
dst[dp++] = int2Byte(bits);
shiftto = 18;
bits = 0;
}
}
if (shiftto == 6) {
dst[dp++] = int2Byte(bits >> 16);
} else if (shiftto == 0) {
dst[dp++] = int2Byte(bits >> 16);
dst[dp++] = int2Byte(bits >> 8);
}
return dst;
}
搞定了