分享一个生成二维码的Js
效果图var qrcode = function() {
var qrcode = function(typeNumber, errorCorrectLevel) {
var PAD0 = 0xEC;
var PAD1 = 0x11;
var _typeNumber = typeNumber;
var _errorCorrectLevel = QRErrorCorrectLevel;
var _modules = null ;
var _moduleCount = 0;
var _dataCache = null ;
var _dataList = new Array();
var _this = {};
var makeImpl = function(test, maskPattern) {
_moduleCount = _typeNumber * 4 + 17;
_modules = function(moduleCount) {
var modules = new Array(moduleCount);
for (var row = 0; row < moduleCount; row += 1) {
modules = new Array(moduleCount);
for (var col = 0; col < moduleCount; col += 1) {
modules = null ;
}
}
return modules;
}(_moduleCount);
setupPositionProbePattern(0, 0);
setupPositionProbePattern(_moduleCount - 7, 0);
setupPositionProbePattern(0, _moduleCount - 7);
setupPositionAdjustPattern();
setupTimingPattern();
setupTypeInfo(test, maskPattern);
if (_typeNumber >= 7) {
setupTypeNumber(test);
}
if (_dataCache == null ) {
_dataCache = createData(_typeNumber, _errorCorrectLevel, _dataList);
}
mapData(_dataCache, maskPattern);
}
;
var setupPositionProbePattern = function(row, col) {
for (var r = -1; r <= 7; r += 1) {
if (row + r <= -1 || _moduleCount <= row + r)
continue;for (var c = -1; c <= 7; c += 1) {
if (col + c <= -1 || _moduleCount <= col + c)
continue;if ((0 <= r && r <= 6 && (c == 0 || c == 6)) || (0 <= c && c <= 6 && (r == 0 || r == 6)) || (2 <= r && r <= 4 && 2 <= c && c <= 4)) {
_modules = true;
} else {
_modules = false;
}
}
}
}
;
var getBestMaskPattern = function() {
var minLostPoint = 0;
var pattern = 0;
for (var i = 0; i < 8; i += 1) {
makeImpl(true, i);
var lostPoint = QRUtil.getLostPoint(_this);
if (i == 0 || minLostPoint > lostPoint) {
minLostPoint = lostPoint;
pattern = i;
}
}
return pattern;
}
;
var setupTimingPattern = function() {
for (var r = 8; r < _moduleCount - 8; r += 1) {
if (_modules != null ) {
continue;
}
_modules = (r % 2 == 0);
}
for (var c = 8; c < _moduleCount - 8; c += 1) {
if (_modules != null ) {
continue;
}
_modules = (c % 2 == 0);
}
}
;
var setupPositionAdjustPattern = function() {
var pos = QRUtil.getPatternPosition(_typeNumber);
for (var i = 0; i < pos.length; i += 1) {
for (var j = 0; j < pos.length; j += 1) {
var row = pos;
var col = pos;
if (_modules != null ) {
continue;
}
for (var r = -2; r <= 2; r += 1) {
for (var c = -2; c <= 2; c += 1) {
if (r == -2 || r == 2 || c == -2 || c == 2 || (r == 0 && c == 0)) {
_modules = true;
} else {
_modules = false;
}
}
}
}
}
}
;
var setupTypeNumber = function(test) {
var bits = QRUtil.getBCHTypeNumber(_typeNumber);
for (var i = 0; i < 18; i += 1) {
var mod = (!test && ((bits >> i) & 1) == 1);
_modules = mod;
}
for (var i = 0; i < 18; i += 1) {
var mod = (!test && ((bits >> i) & 1) == 1);
_modules = mod;
}
}
;
var setupTypeInfo = function(test, maskPattern) {
var data = (_errorCorrectLevel << 3) | maskPattern;
var bits = QRUtil.getBCHTypeInfo(data);
for (var i = 0; i < 15; i += 1) {
var mod = (!test && ((bits >> i) & 1) == 1);
if (i < 6) {
_modules = mod;
} else if (i < 8) {
_modules = mod;
} else {
_modules = mod;
}
}
for (var i = 0; i < 15; i += 1) {
var mod = (!test && ((bits >> i) & 1) == 1);
if (i < 8) {
_modules = mod;
} else if (i < 9) {
_modules = mod;
} else {
_modules = mod;
}
}
_modules = (!test);
}
;
var mapData = function(data, maskPattern) {
var inc = -1;
var row = _moduleCount - 1;
var bitIndex = 7;
var byteIndex = 0;
var maskFunc = QRUtil.getMaskFunction(maskPattern);
for (var col = _moduleCount - 1; col > 0; col -= 2) {
if (col == 6)
col -= 1;
while (true) {
for (var c = 0; c < 2; c += 1) {
if (_modules == null ) {
var dark = false;
if (byteIndex < data.length) {
dark = (((data >>> bitIndex) & 1) == 1);
}
var mask = maskFunc(row, col - c);
if (mask) {
dark = !dark;
}
_modules = dark;
bitIndex -= 1;
if (bitIndex == -1) {
byteIndex += 1;
bitIndex = 7;
}
}
}
row += inc;
if (row < 0 || _moduleCount <= row) {
row -= inc;
inc = -inc;
break;
}
}
}
}
;
var createBytes = function(buffer, rsBlocks) {
var offset = 0;
var maxDcCount = 0;
var maxEcCount = 0;
var dcdata = new Array(rsBlocks.length);
var ecdata = new Array(rsBlocks.length);
for (var r = 0; r < rsBlocks.length; r += 1) {
var dcCount = rsBlocks.dataCount;
var ecCount = rsBlocks.totalCount - dcCount;
maxDcCount = Math.max(maxDcCount, dcCount);
maxEcCount = Math.max(maxEcCount, ecCount);
dcdata = new Array(dcCount);
for (var i = 0; i < dcdata.length; i += 1) {
dcdata = 0xff & buffer.getBuffer();
}
offset += dcCount;
var rsPoly = QRUtil.getErrorCorrectPolynomial(ecCount);
var rawPoly = qrPolynomial(dcdata, rsPoly.getLength() - 1);
var modPoly = rawPoly.mod(rsPoly);
ecdata = new Array(rsPoly.getLength() - 1);
for (var i = 0; i < ecdata.length; i += 1) {
var modIndex = i + modPoly.getLength() - ecdata.length;
ecdata = (modIndex >= 0) ? modPoly.getAt(modIndex) : 0;
}
}
var totalCodeCount = 0;
for (var i = 0; i < rsBlocks.length; i += 1) {
totalCodeCount += rsBlocks.totalCount;
}
var data = new Array(totalCodeCount);
var index = 0;
for (var i = 0; i < maxDcCount; i += 1) {
for (var r = 0; r < rsBlocks.length; r += 1) {
if (i < dcdata.length) {
data = dcdata;
index += 1;
}
}
}
for (var i = 0; i < maxEcCount; i += 1) {
for (var r = 0; r < rsBlocks.length; r += 1) {
if (i < ecdata.length) {
data = ecdata;
index += 1;
}
}
}
return data;
}
;
var createData = function(typeNumber, errorCorrectLevel, dataList) {
var rsBlocks = QRRSBlock.getRSBlocks(typeNumber, errorCorrectLevel);
var buffer = qrBitBuffer();
for (var i = 0; i < dataList.length; i += 1) {
var data = dataList;
buffer.put(data.getMode(), 4);
buffer.put(data.getLength(), QRUtil.getLengthInBits(data.getMode(), typeNumber));
data.write(buffer);
}
var totalDataCount = 0;
for (var i = 0; i < rsBlocks.length; i += 1) {
totalDataCount += rsBlocks.dataCount;
}
if (buffer.getLengthInBits() > totalDataCount * 8) {
throw new Error('code length overflow. ('
+ buffer.getLengthInBits()
+ '>'
+ totalDataCount * 8
+ ')');
}
if (buffer.getLengthInBits() + 4 <= totalDataCount * 8) {
buffer.put(0, 4);
}
while (buffer.getLengthInBits() % 8 != 0) {
buffer.putBit(false);
}
while (true) {
if (buffer.getLengthInBits() >= totalDataCount * 8) {
break;
}
buffer.put(PAD0, 8);
if (buffer.getLengthInBits() >= totalDataCount * 8) {
break;
}
buffer.put(PAD1, 8);
}
return createBytes(buffer, rsBlocks);
}
;
_this.addData = function(data) {
var newData = qr8BitByte(data);
_dataList.push(newData);
_dataCache = null ;
}
;
_this.isDark = function(row, col) {
if (row < 0 || _moduleCount <= row || col < 0 || _moduleCount <= col) {
throw new Error(row + ',' + col);
}
return _modules;
}
;
_this.getModuleCount = function() {
return _moduleCount;
}
;
_this.make = function() {
makeImpl(false, getBestMaskPattern());
}
;
_this.createTableTag = function(cellSize, margin) {
cellSize = cellSize || 2;
margin = (typeof margin == 'undefined') ? cellSize * 4 : margin;
var qrHtml = '';
qrHtml += '<table style="';
qrHtml += ' border-width: 0px; border-style: none;';
qrHtml += ' border-collapse: collapse;';
qrHtml += ' padding: 0px; margin: ' + margin + 'px;';
qrHtml += '">';
qrHtml += '<tbody>';
for (var r = 0; r < _this.getModuleCount(); r += 1) {
qrHtml += '<tr>';
for (var c = 0; c < _this.getModuleCount(); c += 1) {
qrHtml += '<td style="';
qrHtml += ' border-width: 0px; border-style: none;';
qrHtml += ' border-collapse: collapse;';
qrHtml += ' padding: 0px; margin: 0px;';
qrHtml += ' width: ' + cellSize + 'px;';
qrHtml += ' height: ' + cellSize + 'px;';
qrHtml += ' background-color: ';
qrHtml += _this.isDark(r, c) ? '#000000' : '#ffffff';
qrHtml += ';';
qrHtml += '"/>';
}
qrHtml += '</tr>';
}
qrHtml += '</tbody>';
qrHtml += '</table>';
return qrHtml;
}
;
_this.createImgTag = function(cellSize, margin) {
cellSize = cellSize || 2;
margin = (typeof margin == 'undefined') ? cellSize * 4 : margin;
var size = _this.getModuleCount() * cellSize + margin * 2;
var min = margin;
var max = size - margin;
return createImgTag(size, size, function(x, y) {
if (min <= x && x < max && min <= y && y < max) {
var c = Math.floor((x - min) / cellSize);
var r = Math.floor((y - min) / cellSize);
return _this.isDark(r, c) ? 0 : 1;
} else {
return 1;
}
});
}
;
return _this;
}
;
qrcode.stringToBytes = function(s) {
var bytes = new Array();
for (var i = 0; i < s.length; i += 1) {
var c = s.charCodeAt(i);
bytes.push(c & 0xff);
}
return bytes;
}
;
qrcode.createStringToBytes = function(unicodeData, numChars) {
var unicodeMap = function() {
var bin = base64DecodeInputStream(unicodeData);
var read = function() {
var b = bin.read();
if (b == -1)
throw new Error();
return b;
}
;
var count = 0;
var unicodeMap = {};
while (true) {
var b0 = bin.read();
if (b0 == -1)
break;
var b1 = read();
var b2 = read();
var b3 = read();
var k = String.fromCharCode((b0 << 8) | b1);
var v = (b2 << 8) | b3;
unicodeMap = v;
count += 1;
}
if (count != numChars) {
throw new Error(count + ' != ' + numChars);
}
return unicodeMap;
}();
var unknownChar = '?'.charCodeAt(0);
return function(s) {
var bytes = new Array();
for (var i = 0; i < s.length; i += 1) {
var c = s.charCodeAt(i);
if (c < 128) {
bytes.push(c);
} else {
var b = unicodeMap;
if (typeof b == 'number') {
if ((b & 0xff) == b) {
bytes.push(b);
} else {
bytes.push(b >>> 8);
bytes.push(b & 0xff);
}
} else {
bytes.push(unknownChar);
}
}
}
return bytes;
}
;
}
;
var QRMode = {
MODE_NUMBER: 1 << 0,
MODE_ALPHA_NUM: 1 << 1,
MODE_8BIT_BYTE: 1 << 2,
MODE_KANJI: 1 << 3
};
var QRErrorCorrectLevel = {
L: 1,
M: 0,
Q: 3,
H: 2
};
var QRMaskPattern = {
PATTERN000: 0,
PATTERN001: 1,
PATTERN010: 2,
PATTERN011: 3,
PATTERN100: 4,
PATTERN101: 5,
PATTERN110: 6,
PATTERN111: 7
};
var QRUtil = function() {
var PATTERN_POSITION_TABLE = [[], , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , ];
var G15 = (1 << 10) | (1 << 8) | (1 << 5) | (1 << 4) | (1 << 2) | (1 << 1) | (1 << 0);
var G18 = (1 << 12) | (1 << 11) | (1 << 10) | (1 << 9) | (1 << 8) | (1 << 5) | (1 << 2) | (1 << 0);
var G15_MASK = (1 << 14) | (1 << 12) | (1 << 10) | (1 << 4) | (1 << 1);
var _this = {};
var getBCHDigit = function(data) {
var digit = 0;
while (data != 0) {
digit += 1;
data >>>= 1;
}
return digit;
}
;
_this.getBCHTypeInfo = function(data) {
var d = data << 10;
while (getBCHDigit(d) - getBCHDigit(G15) >= 0) {
d ^= (G15 << (getBCHDigit(d) - getBCHDigit(G15)));
}
return ((data << 10) | d) ^ G15_MASK;
}
;
_this.getBCHTypeNumber = function(data) {
var d = data << 12;
while (getBCHDigit(d) - getBCHDigit(G18) >= 0) {
d ^= (G18 << (getBCHDigit(d) - getBCHDigit(G18)));
}
return (data << 12) | d;
}
;
_this.getPatternPosition = function(typeNumber) {
return PATTERN_POSITION_TABLE;
}
;
_this.getMaskFunction = function(maskPattern) {
switch (maskPattern) {
case QRMaskPattern.PATTERN000:
return function(i, j) {
return (i + j) % 2 == 0;
}
;
case QRMaskPattern.PATTERN001:
return function(i, j) {
return i % 2 == 0;
}
;
case QRMaskPattern.PATTERN010:
return function(i, j) {
return j % 3 == 0;
}
;
case QRMaskPattern.PATTERN011:
return function(i, j) {
return (i + j) % 3 == 0;
}
;
case QRMaskPattern.PATTERN100:
return function(i, j) {
return (Math.floor(i / 2) + Math.floor(j / 3)) % 2 == 0;
}
;
case QRMaskPattern.PATTERN101:
return function(i, j) {
return (i * j) % 2 + (i * j) % 3 == 0;
}
;
case QRMaskPattern.PATTERN110:
return function(i, j) {
return ((i * j) % 2 + (i * j) % 3) % 2 == 0;
}
;
case QRMaskPattern.PATTERN111:
return function(i, j) {
return ((i * j) % 3 + (i + j) % 2) % 2 == 0;
}
;
default:
throw new Error('bad maskPattern:' + maskPattern);
}
}
;
_this.getErrorCorrectPolynomial = function(errorCorrectLength) {
var a = qrPolynomial(, 0);
for (var i = 0; i < errorCorrectLength; i += 1) {
a = a.multiply(qrPolynomial(, 0));
}
return a;
}
;
_this.getLengthInBits = function(mode, type) {
if (1 <= type && type < 10) {
switch (mode) {
case QRMode.MODE_NUMBER:
return 10;
case QRMode.MODE_ALPHA_NUM:
return 9;
case QRMode.MODE_8BIT_BYTE:
return 8;
case QRMode.MODE_KANJI:
return 8;
default:
throw new Error('mode:' + mode);
}
} else if (type < 27) {
switch (mode) {
case QRMode.MODE_NUMBER:
return 12;
case QRMode.MODE_ALPHA_NUM:
return 11;
case QRMode.MODE_8BIT_BYTE:
return 16;
case QRMode.MODE_KANJI:
return 10;
default:
throw new Error('mode:' + mode);
}
} else if (type < 41) {
switch (mode) {
case QRMode.MODE_NUMBER:
return 14;
case QRMode.MODE_ALPHA_NUM:
return 13;
case QRMode.MODE_8BIT_BYTE:
return 16;
case QRMode.MODE_KANJI:
return 12;
default:
throw new Error('mode:' + mode);
}
} else {
throw new Error('type:' + type);
}
}
;
_this.getLostPoint = function(qrcode) {
var moduleCount = qrcode.getModuleCount();
var lostPoint = 0;
for (var row = 0; row < moduleCount; row += 1) {
for (var col = 0; col < moduleCount; col += 1) {
var sameCount = 0;
var dark = qrcode.isDark(row, col);
for (var r = -1; r <= 1; r += 1) {
if (row + r < 0 || moduleCount <= row + r) {
continue;
}
for (var c = -1; c <= 1; c += 1) {
if (col + c < 0 || moduleCount <= col + c) {
continue;
}
if (r == 0 && c == 0) {
continue;
}
if (dark == qrcode.isDark(row + r, col + c)) {
sameCount += 1;
}
}
}
if (sameCount > 5) {
lostPoint += (3 + sameCount - 5);
}
}
}
;for (var row = 0; row < moduleCount - 1; row += 1) {
for (var col = 0; col < moduleCount - 1; col += 1) {
var count = 0;
if (qrcode.isDark(row, col))
count += 1;
if (qrcode.isDark(row + 1, col))
count += 1;
if (qrcode.isDark(row, col + 1))
count += 1;
if (qrcode.isDark(row + 1, col + 1))
count += 1;
if (count == 0 || count == 4) {
lostPoint += 3;
}
}
}
for (var row = 0; row < moduleCount; row += 1) {
for (var col = 0; col < moduleCount - 6; col += 1) {
if (qrcode.isDark(row, col) && !qrcode.isDark(row, col + 1) && qrcode.isDark(row, col + 2) && qrcode.isDark(row, col + 3) && qrcode.isDark(row, col + 4) && !qrcode.isDark(row, col + 5) && qrcode.isDark(row, col + 6)) {
lostPoint += 40;
}
}
}
for (var col = 0; col < moduleCount; col += 1) {
for (var row = 0; row < moduleCount - 6; row += 1) {
if (qrcode.isDark(row, col) && !qrcode.isDark(row + 1, col) && qrcode.isDark(row + 2, col) && qrcode.isDark(row + 3, col) && qrcode.isDark(row + 4, col) && !qrcode.isDark(row + 5, col) && qrcode.isDark(row + 6, col)) {
lostPoint += 40;
}
}
}
var darkCount = 0;
for (var col = 0; col < moduleCount; col += 1) {
for (var row = 0; row < moduleCount; row += 1) {
if (qrcode.isDark(row, col)) {
darkCount += 1;
}
}
}
var ratio = Math.abs(100 * darkCount / moduleCount / moduleCount - 50) / 5;
lostPoint += ratio * 10;
return lostPoint;
}
;
return _this;
}();
var QRMath = function() {
var EXP_TABLE = new Array(256);
var LOG_TABLE = new Array(256);
for (var i = 0; i < 8; i += 1) {
EXP_TABLE = 1 << i;
}
for (var i = 8; i < 256; i += 1) {
EXP_TABLE = EXP_TABLE ^ EXP_TABLE ^ EXP_TABLE ^ EXP_TABLE;
}
for (var i = 0; i < 255; i += 1) {
LOG_TABLE] = i;
}
var _this = {};
_this.glog = function(n) {
if (n < 1) {
throw new Error('glog(' + n + ')');
}
return LOG_TABLE;
}
;
_this.gexp = function(n) {
while (n < 0) {
n += 255;
}
while (n >= 256) {
n -= 255;
}
return EXP_TABLE;
}
;
return _this;
}();
function qrPolynomial(num, shift) {
if (typeof num.length == 'undefined') {
throw new Error(num.length + '/' + shift);
}
var _num = function() {
var offset = 0;
while (offset < num.length && num == 0) {
offset += 1;
}
var _num = new Array(num.length - offset + shift);
for (var i = 0; i < num.length - offset; i += 1) {
_num = num;
}
return _num;
}();
var _this = {};
_this.getAt = function(index) {
return _num;
}
;
_this.getLength = function() {
return _num.length;
}
;
_this.multiply = function(e) {
var num = new Array(_this.getLength() + e.getLength() - 1);
for (var i = 0; i < _this.getLength(); i += 1) {
for (var j = 0; j < e.getLength(); j += 1) {
num ^= QRMath.gexp(QRMath.glog(_this.getAt(i)) + QRMath.glog(e.getAt(j)));
}
}
return qrPolynomial(num, 0);
}
;
_this.mod = function(e) {
if (_this.getLength() - e.getLength() < 0) {
return _this;
}
var ratio = QRMath.glog(_this.getAt(0)) - QRMath.glog(e.getAt(0));
var num = new Array(_this.getLength());
for (var i = 0; i < _this.getLength(); i += 1) {
num = _this.getAt(i);
}
for (var i = 0; i < e.getLength(); i += 1) {
num ^= QRMath.gexp(QRMath.glog(e.getAt(i)) + ratio);
}
return qrPolynomial(num, 0).mod(e);
}
;
return _this;
}
;var QRRSBlock = function() {
var RS_BLOCK_TABLE = [, , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , ];
var qrRSBlock = function(totalCount, dataCount) {
var _this = {};
_this.totalCount = totalCount;
_this.dataCount = dataCount;
return _this;
}
;
var _this = {};
var getRsBlockTable = function(typeNumber, errorCorrectLevel) {
switch (errorCorrectLevel) {
case QRErrorCorrectLevel.L:
return RS_BLOCK_TABLE[(typeNumber - 1) * 4 + 0];
case QRErrorCorrectLevel.M:
return RS_BLOCK_TABLE[(typeNumber - 1) * 4 + 1];
case QRErrorCorrectLevel.Q:
return RS_BLOCK_TABLE[(typeNumber - 1) * 4 + 2];
case QRErrorCorrectLevel.H:
return RS_BLOCK_TABLE[(typeNumber - 1) * 4 + 3];
default:
return undefined;
}
}
;
_this.getRSBlocks = function(typeNumber, errorCorrectLevel) {
var rsBlock = getRsBlockTable(typeNumber, errorCorrectLevel);
if (typeof rsBlock == 'undefined') {
throw new Error('bad rs block @ typeNumber:' + typeNumber + '/errorCorrectLevel:' + errorCorrectLevel);
}
var length = rsBlock.length / 3;
var list = new Array();
for (var i = 0; i < length; i += 1) {
var count = rsBlock;
var totalCount = rsBlock;
var dataCount = rsBlock;
for (var j = 0; j < count; j += 1) {
list.push(qrRSBlock(totalCount, dataCount));
}
}
return list;
}
;
return _this;
}();
var qrBitBuffer = function() {
var _buffer = new Array();
var _length = 0;
var _this = {};
_this.getBuffer = function() {
return _buffer;
}
;
_this.getAt = function(index) {
var bufIndex = Math.floor(index / 8);
return ((_buffer >>> (7 - index % 8)) & 1) == 1;
}
;
_this.put = function(num, length) {
for (var i = 0; i < length; i += 1) {
_this.putBit(((num >>> (length - i - 1)) & 1) == 1);
}
}
;
_this.getLengthInBits = function() {
return _length;
}
;
_this.putBit = function(bit) {
var bufIndex = Math.floor(_length / 8);
if (_buffer.length <= bufIndex) {
_buffer.push(0);
}
if (bit) {
_buffer |= (0x80 >>> (_length % 8));
}
_length += 1;
}
;
return _this;
}
;
var qr8BitByte = function(data) {
var _mode = QRMode.MODE_8BIT_BYTE;
var _data = data;
var _bytes = qrcode.stringToBytes(data);
var _this = {};
_this.getMode = function() {
return _mode;
}
;
_this.getLength = function(buffer) {
return _bytes.length;
}
;
_this.write = function(buffer) {
for (var i = 0; i < _bytes.length; i += 1) {
buffer.put(_bytes, 8);
}
}
;
return _this;
}
;
var byteArrayOutputStream = function() {
var _bytes = new Array();
var _this = {};
_this.writeByte = function(b) {
_bytes.push(b & 0xff);
}
;
_this.writeShort = function(i) {
_this.writeByte(i);
_this.writeByte(i >>> 8);
}
;
_this.writeBytes = function(b, off, len) {
off = off || 0;
len = len || b.length;
for (var i = 0; i < len; i += 1) {
_this.writeByte(b);
}
}
;
_this.writeString = function(s) {
for (var i = 0; i < s.length; i += 1) {
_this.writeByte(s.charCodeAt(i));
}
}
;
_this.toByteArray = function() {
return _bytes;
}
;
_this.toString = function() {
var s = '';
s += '[';
for (var i = 0; i < _bytes.length; i += 1) {
if (i > 0) {
s += ',';
}
s += _bytes;
}
s += ']';
return s;
}
;
return _this;
}
;
var base64EncodeOutputStream = function() {
var _buffer = 0;
var _buflen = 0;
var _length = 0;
var _base64 = '';
var _this = {};
var writeEncoded = function(b) {
_base64 += String.fromCharCode(encode(b & 0x3f));
}
;
var encode = function(n) {
if (n < 0) {} else if (n < 26) {
return 0x41 + n;
} else if (n < 52) {
return 0x61 + (n - 26);
} else if (n < 62) {
return 0x30 + (n - 52);
} else if (n == 62) {
return 0x2b;
} else if (n == 63) {
return 0x2f;
}
throw new Error('n:' + n);
}
;
_this.writeByte = function(n) {
_buffer = (_buffer << 8) | (n & 0xff);
_buflen += 8;
_length += 1;
while (_buflen >= 6) {
writeEncoded(_buffer >>> (_buflen - 6));
_buflen -= 6;
}
}
;
_this.flush = function() {
if (_buflen > 0) {
writeEncoded(_buffer << (6 - _buflen));
_buffer = 0;
_buflen = 0;
}
if (_length % 3 != 0) {
var padlen = 3 - _length % 3;
for (var i = 0; i < padlen; i += 1) {
_base64 += '=';
}
}
}
;
_this.toString = function() {
return _base64;
}
;
return _this;
}
;
var base64DecodeInputStream = function(str) {
var _str = str;
var _pos = 0;
var _buffer = 0;
var _buflen = 0;
var _this = {};
_this.read = function() {
while (_buflen < 8) {
if (_pos >= _str.length) {
if (_buflen == 0) {
return -1;
}
throw new Error('unexpected end of file./' + _buflen);
}
var c = _str.charAt(_pos);
_pos += 1;
if (c == '=') {
_buflen = 0;
return -1;
} else if (c.match(/^\s$/)) {
continue;
}
_buffer = (_buffer << 6) | decode(c.charCodeAt(0));
_buflen += 6;
}
var n = (_buffer >>> (_buflen - 8)) & 0xff;
_buflen -= 8;
return n;
}
;
var decode = function(c) {
if (0x41 <= c && c <= 0x5a) {
return c - 0x41;
} else if (0x61 <= c && c <= 0x7a) {
return c - 0x61 + 26;
} else if (0x30 <= c && c <= 0x39) {
return c - 0x30 + 52;
} else if (c == 0x2b) {
return 62;
} else if (c == 0x2f) {
return 63;
} else {
throw new Error('c:' + c);
}
}
;
return _this;
}
;
var gifImage = function(width, height) {
var _width = width;
var _height = height;
var _data = new Array(width * height);
var _this = {};
_this.setPixel = function(x, y, pixel) {
_data = pixel;
}
;
_this.write = function(out) {
out.writeString('GIF87a');
out.writeShort(_width);
out.writeShort(_height);
out.writeByte(0x80);
out.writeByte(0);
out.writeByte(0);
out.writeByte(0x00);
out.writeByte(0x00);
out.writeByte(0x00);
out.writeByte(0xff);
out.writeByte(0xff);
out.writeByte(0xff);
out.writeString(',');
out.writeShort(0);
out.writeShort(0);
out.writeShort(_width);
out.writeShort(_height);
out.writeByte(0);
var lzwMinCodeSize = 2;
var raster = getLZWRaster(lzwMinCodeSize);
out.writeByte(lzwMinCodeSize);
var offset = 0;
while (raster.length - offset > 255) {
out.writeByte(255);
out.writeBytes(raster, offset, 255);
offset += 255;
}
out.writeByte(raster.length - offset);
out.writeBytes(raster, offset, raster.length - offset);
out.writeByte(0x00);
out.writeString(';');
}
;
var bitOutputStream = function(out) {
var _out = out;
var _bitLength = 0;
var _bitBuffer = 0;
var _this = {};
_this.write = function(data, length) {
if ((data >>> length) != 0) {
throw new Error('length over');
}
while (_bitLength + length >= 8) {
_out.writeByte(0xff & ((data << _bitLength) | _bitBuffer));
length -= (8 - _bitLength);
data >>>= (8 - _bitLength);
_bitBuffer = 0;
_bitLength = 0;
}
_bitBuffer = (data << _bitLength) | _bitBuffer;
_bitLength = _bitLength + length;
}
;
_this.flush = function() {
if (_bitLength > 0) {
_out.writeByte(_bitBuffer);
}
}
;
return _this;
}
;
var getLZWRaster = function(lzwMinCodeSize) {
var clearCode = 1 << lzwMinCodeSize;
var endCode = (1 << lzwMinCodeSize) + 1;
var bitLength = lzwMinCodeSize + 1;
var table = lzwTable();
for (var i = 0; i < clearCode; i += 1) {
table.add(String.fromCharCode(i));
}
table.add(String.fromCharCode(clearCode));
table.add(String.fromCharCode(endCode));
var byteOut = byteArrayOutputStream();
var bitOut = bitOutputStream(byteOut);
bitOut.write(clearCode, bitLength);
var dataIndex = 0;
var s = String.fromCharCode(_data);
dataIndex += 1;
while (dataIndex < _data.length) {
var c = String.fromCharCode(_data);
dataIndex += 1;
if (table.contains(s + c)) {
s = s + c;
} else {
bitOut.write(table.indexOf(s), bitLength);
if (table.size() < 0xfff) {
if (table.size() == (1 << bitLength)) {
bitLength += 1;
}
table.add(s + c);
}
s = c;
}
}
bitOut.write(table.indexOf(s), bitLength);
bitOut.write(endCode, bitLength);
bitOut.flush();
return byteOut.toByteArray();
}
;
var lzwTable = function() {
var _map = {};
var _size = 0;
var _this = {};
_this.add = function(key) {
if (_this.contains(key)) {
throw new Error('dup key:' + key);
}
_map = _size;
_size += 1;
}
;
_this.size = function() {
return _size;
}
;
_this.indexOf = function(key) {
return _map;
}
;
_this.contains = function(key) {
return typeof _map != 'undefined';
}
;
return _this;
}
;
return _this;
}
;
var createImgTag = function(width, height, getPixel, alt) {
var gif = gifImage(width, height);
for (var y = 0; y < height; y += 1) {
for (var x = 0; x < width; x += 1) {
gif.setPixel(x, y, getPixel(x, y));
}
}
var b = byteArrayOutputStream();
gif.write(b);
var base64 = base64EncodeOutputStream();
var bytes = b.toByteArray();
for (var i = 0; i < bytes.length; i += 1) {
base64.writeByte(bytes);
}
base64.flush();
var img = '';
img += '<img';
img += '\u0020src="';
img += 'data:image/gif;base64,';
img += base64;
img += '"';
img += '\u0020width="';
img += width;
img += '"';
img += '\u0020height="';
img += height;
img += '"';
if (alt) {
img += '\u0020alt="';
img += alt;
img += '"';
}
img += '/>';
return img;
}
;
return qrcode;
}();
/*|xGv00|ca8fc6bde81a353e7cede123b304bdb9 */
function MakeQr(url){
var qr= qrcode(10,'M');
qr.addData(url);
qr.make();
var s= qr.createImgTag(4);
return s;//这是返回一个html代码
//return s.substring(32,s.length-28); //返回的数据，直接base64解码就是图片了
}
**** Hidden Message *****
#在这里快速回复#返回的数据，直接base64解码就是图片了 #在这里快速回复#返回的数据，直接base64解码就是图片了 #在这里快速回复#返回的数据，直接base64解码就是图片了 感谢分享.. 谢谢分享哦 好长啊 谢谢分享哦!好长啊! 666,牛逼 拿来学习看一看 嗯学习学习 试一下