纯js生成QRCode
纯js，不依赖jquery，非常好用，废话不多说，直接上代码！
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<meta name="viewport" content="width=device-width, initial-scale=1,maximum-scale=1, user-scalable=no" />
<title></title>
<script type="text/javascript" src="qrcode.js"></script>
</head>
<body>
<div id="qrcode"></div>
<script type="text/javascript">
var container = document.getElementById("qrcode");
var qrcode = new QRCode(container, { width : 128, height : 128});
qrcode.makeCode('http://www.baidu.com');
// 也可以：new QRCode(container, { width : 128, height : 128}).makeCode('http://www.baidu.com');
</script>
</body>
</html>
var QRCode;
(function () {
//---------------------------------------------------------------------
// QRCode for JavaScript
//---------------------------------------------------------------------
function QR8bitByte(data) {
this.mode = QRMode.MODE_8BIT_BYTE;
this.data = data;
this.parsedData = [];
// Added to support UTF-8 Characters
for (var i = 0, l = this.data.length; i < l; i++) {
var byteArray = [];
var code = this.data.charCodeAt(i);
if (code > 0x10000) {
byteArray[0] = 0xF0 | ((code & 0x1C0000) >>> 18);
byteArray[1] = 0x80 | ((code & 0x3F000) >>> 12);
byteArray[2] = 0x80 | ((code & 0xFC0) >>> 6);
byteArray[3] = 0x80 | (code & 0x3F);
} else if (code > 0x800) {
byteArray[0] = 0xE0 | ((code & 0xF000) >>> 12);
byteArray[1] = 0x80 | ((code & 0xFC0) >>> 6);
byteArray[2] = 0x80 | (code & 0x3F);
} else if (code > 0x80) {
byteArray[0] = 0xC0 | ((code & 0x7C0) >>> 6);
byteArray[1] = 0x80 | (code & 0x3F);
} else {
byteArray[0] = code;
}
this.parsedData.push(byteArray);
}
this.parsedData = Array.prototype.concat.apply([], this.parsedData);
if (this.parsedData.length != this.data.length) {
this.parsedData.unshift(191);
this.parsedData.unshift(187);
this.parsedData.unshift(239);
}
}
QR8bitByte.prototype = {
getLength: function (buffer) {
return this.parsedData.length;
},
write: function (buffer) {
for (var i = 0, l = this.parsedData.length; i < l; i++) {
buffer.put(this.parsedData[i], 8);
}
}
};
function QRCodeModel(typeNumber, errorCorrectLevel) {
this.typeNumber = typeNumber;
this.errorCorrectLevel = errorCorrectLevel;
this.modules = null;
this.moduleCount = 0;
this.dataCache = null;
this.dataList = [];
}
function QRPolynomial(num, shift) {
if (num.length == undefined) throw new Error(num.length + "/" + shift);
var offset = 0;
while (offset < num.length && num[offset] == 0) offset++;
this.num = new Array(num.length - offset + shift);
for (var i = 0; i < num.length - offset; i++) this.num[i] = num[i + offset];
}
function QRRSBlock(totalCount, dataCount) {
this.totalCount = totalCount, this.dataCount = dataCount;
}
function QRBitBuffer() {
this.buffer = [], this.length = 0;
}
QRCodeModel.prototype = {
"addData": function(data) {
var newData = new QR8bitByte(data);
this.dataList.push(newData), this.dataCache = null;
},
"isDark": function(row, col) {
if (row < 0 || this.moduleCount <= row || col < 0 || this.moduleCount <= col) throw new Error(row + "," + col);
return this.modules[row][col];
},
"getModuleCount": function() {
return this.moduleCount;
},
"make": function() {
this.makeImpl(!1, this.getBestMaskPattern());
},
"makeImpl": function(test, maskPattern) {
this.moduleCount = this.typeNumber * 4 + 17, this.modules = new Array(this.moduleCount);
for (var row = 0; row < this.moduleCount; row++) {
this.modules[row] = new Array(this.moduleCount);
for (var col = 0; col < this.moduleCount; col++) this.modules[row][col] = null;
}
this.setupPositionProbePattern(0, 0),
this.setupPositionProbePattern(this.moduleCount - 7, 0),
this.setupPositionProbePattern(0, this.moduleCount - 7),
this.setupPositionAdjustPattern(), this.setupTimingPattern(),
this.setupTypeInfo(test, maskPattern),
this.typeNumber >= 7 && this.setupTypeNumber(test),
this.dataCache == null && (this.dataCache = QRCodeModel.createData(this.typeNumber, this.errorCorrectLevel, this.dataList)), this.mapData(this.dataCache, maskPattern);
},
"setupPositionProbePattern": function(row, col) {
for (var r = -1; r <= 7; r++) {
if (row + r <= -1 || this.moduleCount <= row + r) continue;
for (var c = -1; c <= 7; c++) {
if (col + c <= -1 || this.moduleCount <= col + c) continue;
0 <= r && r <= 6 && (c == 0 || c == 6) || 0 <= c && c <= 6 && (r == 0 || r == 6) || 2 <= r && r <= 4 && 2 <= c && c <= 4 ? this.modules[row + r][col + c] = !0 : this.modules[row + r][col + c] = !1;
}
}
},
"getBestMaskPattern": function() {
var minLostPoint = 0, pattern = 0;
for (var i = 0; i < 8; i++) {
this.makeImpl(!0, i);
var lostPoint = QRUtil.getLostPoint(this);
if (i == 0 || minLostPoint > lostPoint) minLostPoint = lostPoint, pattern = i;
}
return pattern;
},
"createMovieClip": function(target_mc, instance_name, depth) {
var qr_mc = target_mc.createEmptyMovieClip(instance_name, depth), cs = 1;
this.make();
for (var row = 0; row < this.modules.length; row++) {
var y = row * cs;
for (var col = 0; col < this.modules[row].length; col++) {
var x = col * cs, dark = this.modules[row][col];
dark && (qr_mc.beginFill(0, 100), qr_mc.moveTo(x, y), qr_mc.lineTo(x + cs, y), qr_mc.lineTo(x + cs, y + cs), qr_mc.lineTo(x, y + cs), qr_mc.endFill());
}
}
return qr_mc;
},
"setupTimingPattern": function() {
for (var r = 8; r < this.moduleCount - 8; r++) {
if (this.modules[r][6] != null) continue;
this.modules[r][6] = r % 2 == 0;
}
for (var c = 8; c < this.moduleCount - 8; c++) {
if (this.modules[6][c] != null) continue;
this.modules[6][c] = c % 2 == 0;
}
},
"setupPositionAdjustPattern": function() {
var pos = QRUtil.getPatternPosition(this.typeNumber);
for (var i = 0; i < pos.length; i++) for (var j = 0; j < pos.length; j++) {
var row = pos[i], col = pos[j];
if (this.modules[row][col] != null) continue;
for (var r = -2; r <= 2; r++) for (var c = -2; c <= 2; c++) r == -2 || r == 2 || c == -2 || c == 2 || r == 0 && c == 0 ? this.modules[row + r][col + c] = !0 : this.modules[row + r][col + c] = !1;
}
},
"setupTypeNumber": function(test) {
var bits = QRUtil.getBCHTypeNumber(this.typeNumber);
for (var i = 0; i < 18; i++) {
var mod = !test && (bits >> i & 1) == 1;
this.modules[Math.floor(i / 3)][i % 3 + this.moduleCount - 8 - 3] = mod;
}
for (var i = 0; i < 18; i++) {
var mod = !test && (bits >> i & 1) == 1;
this.modules[i % 3 + this.moduleCount - 8 - 3][Math.floor(i / 3)] = mod;
}
},
"setupTypeInfo": function(test, maskPattern) {
var data = this.errorCorrectLevel << 3 | maskPattern, bits = QRUtil.getBCHTypeInfo(data);
for (var i = 0; i < 15; i++) {
var mod = !test && (bits >> i & 1) == 1;
i < 6 ? this.modules[i][8] = mod : i < 8 ? this.modules[i + 1][8] = mod : this.modules[this.moduleCount - 15 + i][8] = mod;
}
for (var i = 0; i < 15; i++) {
var mod = !test && (bits >> i & 1) == 1;
i < 8 ? this.modules[8][this.moduleCount - i - 1] = mod : i < 9 ? this.modules[8][15 - i - 1 + 1] = mod : this.modules[8][15 - i - 1] = mod;
}
this.modules[this.moduleCount - 8][8] = !test;
},
"mapData": function(data, maskPattern) {
var inc = -1, row = this.moduleCount - 1, bitIndex = 7, byteIndex = 0;
for (var col = this.moduleCount - 1; col > 0; col -= 2) {
col == 6 && col--;
for (;;) {
for (var c = 0; c < 2; c++) if (this.modules[row][col - c] == null) {
var dark = !1;
byteIndex < data.length && (dark = (data[byteIndex] >>> bitIndex & 1) == 1);
var mask = QRUtil.getMask(maskPattern, row, col - c);
mask && (dark = !dark), this.modules[row][col - c] = dark, bitIndex--, bitIndex == -1 && (byteIndex++, bitIndex = 7);
}
row += inc;
if (row < 0 || this.moduleCount <= row) {
row -= inc, inc = -inc;
break;
}
}
}
}
}, QRCodeModel.PAD0 = 236, QRCodeModel.PAD1 = 17, QRCodeModel.createData = function(typeNumber, errorCorrectLevel, dataList) {
var rsBlocks = QRRSBlock.getRSBlocks(typeNumber, errorCorrectLevel), buffer = new QRBitBuffer;
for (var i = 0; i < dataList.length; i++) {
var data = dataList[i];
buffer.put(data.mode, 4), buffer.put(data.getLength(), QRUtil.getLengthInBits(data.mode, typeNumber)), data.write(buffer);
}
var totalDataCount = 0;
for (var i = 0; i < rsBlocks.length; i++) totalDataCount += rsBlocks[i].dataCount;
if (buffer.getLengthInBits() > totalDataCount * 8) throw new Error("code length overflow. (" + buffer.getLengthInBits() + ">" + totalDataCount * 8 + ")");
buffer.getLengthInBits() + 4 <= totalDataCount * 8 && buffer.put(0, 4);
while (buffer.getLengthInBits() % 8 != 0) buffer.putBit(!1);
for (;;) {
if (buffer.getLengthInBits() >= totalDataCount * 8) break;
buffer.put(QRCodeModel.PAD0, 8);
if (buffer.getLengthInBits() >= totalDataCount * 8) break;
buffer.put(QRCodeModel.PAD1, 8);
}
return QRCodeModel.createBytes(buffer, rsBlocks);
}, QRCodeModel.createBytes = function(buffer, rsBlocks) {
var offset = 0, maxDcCount = 0, maxEcCount = 0, dcdata = new Array(rsBlocks.length), ecdata = new Array(rsBlocks.length);
for (var r = 0; r < rsBlocks.length; r++) {
var dcCount = rsBlocks[r].dataCount, ecCount = rsBlocks[r].totalCount - dcCount;
maxDcCount = Math.max(maxDcCount, dcCount), maxEcCount = Math.max(maxEcCount, ecCount), dcdata[r] = new Array(dcCount);
for (var i = 0; i < dcdata[r].length; i++) dcdata[r][i] = 255 & buffer.buffer[i + offset];
offset += dcCount;
var rsPoly = QRUtil.getErrorCorrectPolynomial(ecCount), rawPoly = new QRPolynomial(dcdata[r], rsPoly.getLength() - 1), modPoly = rawPoly.mod(rsPoly);
ecdata[r] = new Array(rsPoly.getLength() - 1);
for (var i = 0; i < ecdata[r].length; i++) {
var modIndex = i + modPoly.getLength() - ecdata[r].length;
ecdata[r][i] = modIndex >= 0 ? modPoly.get(modIndex) : 0;
}
}
var totalCodeCount = 0;
for (var i = 0; i < rsBlocks.length; i++) totalCodeCount += rsBlocks[i].totalCount;
var data = new Array(totalCodeCount), index = 0;
for (var i = 0; i < maxDcCount; i++) for (var r = 0; r < rsBlocks.length; r++) i < dcdata[r].length && (data[index++] = dcdata[r][i]);
for (var i = 0; i < maxEcCount; i++) for (var r = 0; r < rsBlocks.length; r++) i < ecdata[r].length && (data[index++] = ecdata[r][i]);
return data;
};
var QRMode = {
"MODE_NUMBER": 1,
"MODE_ALPHA_NUM": 2,
"MODE_8BIT_BYTE": 4,
"MODE_KANJI": 8
}, QRErrorCorrectLevel = {
"L": 1,
"M": 0,
"Q": 3,
"H": 2
}, QRMaskPattern = {
"PATTERN000": 0,
"PATTERN001": 1,
"PATTERN010": 2,
"PATTERN011": 3,
"PATTERN100": 4,
"PATTERN101": 5,
"PATTERN110": 6,
"PATTERN111": 7
}, QRUtil = {
"PATTERN_POSITION_TABLE": [ [], [ 6, 18 ], [ 6, 22 ], [ 6, 26 ], [ 6, 30 ], [ 6, 34 ], [ 6, 22, 38 ], [ 6, 24, 42 ], [ 6, 26, 46 ], [ 6, 28, 50 ], [ 6, 30, 54 ], [ 6, 32, 58 ], [ 6, 34, 62 ], [ 6, 26, 46, 66 ], [ 6, 26, 48, 70 ], [ 6, 26, 50, 74 ], [ 6, 30, 54, 78 ], [ 6, 30, 56, 82 ], [ 6, 30, 58, 86 ], [ 6, 34, 62, 90 ], [ 6, 28, 50, 72, 94 ], [ 6, 26, 50, 74, 98 ], [ 6, 30, 54, 78, 102 ], [ 6, 28, 54, 80, 106 ], [ 6, 32, 58, 84, 110 ], [ 6, 30, 58, 86, 114 ], [ 6, 34, 62, 90, 118 ], [ 6, 26, 50, 74, 98, 122 ], [ 6, 30, 54, 78, 102, 126 ], [ 6, 26, 52, 78, 104, 130 ], [ 6, 30, 56, 82, 108, 134 ], [ 6, 34, 60, 86, 112, 138 ], [ 6, 30, 58, 86, 114, 142 ], [ 6, 34, 62, 90, 118, 146 ], [ 6, 30, 54, 78, 102, 126, 150 ], [ 6, 24, 50, 76, 102, 128, 154 ], [ 6, 28, 54, 80, 106, 132, 158 ], [ 6, 32, 58, 84, 110, 136, 162 ], [ 6, 26, 54, 82, 110, 138, 166 ], [ 6, 30, 58, 86, 114, 142, 170 ] ],
"G15": 1335,
"G18": 7973,
"G15_MASK": 21522,
"getBCHTypeInfo": function(data) {
var d = data << 10;
while (QRUtil.getBCHDigit(d) - QRUtil.getBCHDigit(QRUtil.G15) >= 0) d ^= QRUtil.G15 << QRUtil.getBCHDigit(d) - QRUtil.getBCHDigit(QRUtil.G15);
return (data << 10 | d) ^ QRUtil.G15_MASK;
},
"getBCHTypeNumber": function(data) {
var d = data << 12;
while (QRUtil.getBCHDigit(d) - QRUtil.getBCHDigit(QRUtil.G18) >= 0) d ^= QRUtil.G18 << QRUtil.getBCHDigit(d) - QRUtil.getBCHDigit(QRUtil.G18);
return data << 12 | d;
},
"getBCHDigit": function(data) {
var digit = 0;
while (data != 0) digit++, data >>>= 1;
return digit;
},
"getPatternPosition": function(typeNumber) {
return QRUtil.PATTERN_POSITION_TABLE[typeNumber - 1];
},
"getMask": function(maskPattern, i, j) {
switch (maskPattern) {
case QRMaskPattern.PATTERN000:
return (i + j) % 2 == 0;
case QRMaskPattern.PATTERN001:
return i % 2 == 0;
case QRMaskPattern.PATTERN010:
return j % 3 == 0;
case QRMaskPattern.PATTERN011:
return (i + j) % 3 == 0;
case QRMaskPattern.PATTERN100:
return (Math.floor(i / 2) + Math.floor(j / 3)) % 2 == 0;
case QRMaskPattern.PATTERN101:
return i * j % 2 + i * j % 3 == 0;
case QRMaskPattern.PATTERN110:
return (i * j % 2 + i * j % 3) % 2 == 0;
case QRMaskPattern.PATTERN111:
return (i * j % 3 + (i + j) % 2) % 2 == 0;
default:
throw new Error("bad maskPattern:" + maskPattern);
}
},
"getErrorCorrectPolynomial": function(errorCorrectLength) {
var a = new QRPolynomial([ 1 ], 0);
for (var i = 0; i < errorCorrectLength; i++) a = a.multiply(new QRPolynomial([ 1, QRMath.gexp(i) ], 0));
return a;
},
"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)) throw new Error("type:" + type);
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);
}
}
},
"getLostPoint": function(qrCode) {
var moduleCount = qrCode.getModuleCount(), lostPoint = 0;
for (var row = 0; row < moduleCount; row++) for (var col = 0; col < moduleCount; col++) {
var sameCount = 0, dark = qrCode.isDark(row, col);
for (var r = -1; r <= 1; r++) {
if (row + r < 0 || moduleCount <= row + r) continue;
for (var c = -1; c <= 1; c++) {
if (col + c < 0 || moduleCount <= col + c) continue;
if (r == 0 && c == 0) continue;
dark == qrCode.isDark(row + r, col + c) && sameCount++;
}
}
sameCount > 5 && (lostPoint += 3 + sameCount - 5);
}
for (var row = 0; row < moduleCount - 1; row++) for (var col = 0; col < moduleCount - 1; col++) {
var count = 0;
qrCode.isDark(row, col) && count++, qrCode.isDark(row + 1, col) && count++, qrCode.isDark(row, col + 1) && count++, qrCode.isDark(row + 1, col + 1) && count++;
if (count == 0 || count == 4) lostPoint += 3;
}
for (var row = 0; row < moduleCount; row++) for (var col = 0; col < moduleCount - 6; col++) 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++) for (var row = 0; row < moduleCount - 6; row++) 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++) for (var row = 0; row < moduleCount; row++) qrCode.isDark(row, col) && darkCount++;
var ratio = Math.abs(100 * darkCount / moduleCount / moduleCount - 50) / 5;
return lostPoint += ratio * 10, lostPoint;
}
}, QRMath = {
"glog": function(n) {
if (n < 1) throw new Error("glog(" + n + ")");
return QRMath.LOG_TABLE[n];
},
"gexp": function(n) {
while (n < 0) n += 255;
while (n >= 256) n -= 255;
return QRMath.EXP_TABLE[n];
},
"EXP_TABLE": new Array(256),
"LOG_TABLE": new Array(256)
};
for (var i = 0; i < 8; i++) QRMath.EXP_TABLE[i] = 1 << i;
for (var i = 8; i < 256; i++) QRMath.EXP_TABLE[i] = QRMath.EXP_TABLE[i - 4] ^ QRMath.EXP_TABLE[i - 5] ^ QRMath.EXP_TABLE[i - 6] ^ QRMath.EXP_TABLE[i - 8];
for (var i = 0; i < 255; i++) QRMath.LOG_TABLE[QRMath.EXP_TABLE[i]] = i;
QRPolynomial.prototype = {
"get": function(index) {
return this.num[index];
},
"getLength": function() {
return this.num.length;
},
"multiply": function(e) {
var num = new Array(this.getLength() + e.getLength() - 1);
for (var i = 0; i < this.getLength(); i++) for (var j = 0; j < e.getLength(); j++) num[i + j] ^= QRMath.gexp(QRMath.glog(this.get(i)) + QRMath.glog(e.get(j)));
return new QRPolynomial(num, 0);
},
"mod": function(e) {
if (this.getLength() - e.getLength() < 0) return this;
var ratio = QRMath.glog(this.get(0)) - QRMath.glog(e.get(0)), num = new Array(this.getLength());
for (var i = 0; i < this.getLength(); i++) num[i] = this.get(i);
for (var i = 0; i < e.getLength(); i++) num[i] ^= QRMath.gexp(QRMath.glog(e.get(i)) + ratio);
return (new QRPolynomial(num, 0)).mod(e);
}
}, QRRSBlock.RS_BLOCK_TABLE = [ [ 1, 26, 19 ], [ 1, 26, 16 ], [ 1, 26, 13 ], [ 1, 26, 9 ], [ 1, 44, 34 ], [ 1, 44, 28 ], [ 1, 44, 22 ], [ 1, 44, 16 ], [ 1, 70, 55 ], [ 1, 70, 44 ], [ 2, 35, 17 ], [ 2, 35, 13 ], [ 1, 100, 80 ], [ 2, 50, 32 ], [ 2, 50, 24 ], [ 4, 25, 9 ], [ 1, 134, 108 ], [ 2, 67, 43 ], [ 2, 33, 15, 2, 34, 16 ], [ 2, 33, 11, 2, 34, 12 ], [ 2, 86, 68 ], [ 4, 43, 27 ], [ 4, 43, 19 ], [ 4, 43, 15 ], [ 2, 98, 78 ], [ 4, 49, 31 ], [ 2, 32, 14, 4, 33, 15 ], [ 4, 39, 13, 1, 40, 14 ], [ 2, 121, 97 ], [ 2, 60, 38, 2, 61, 39 ], [ 4, 40, 18, 2, 41, 19 ], [ 4, 40, 14, 2, 41, 15 ], [ 2, 146, 116 ], [ 3, 58, 36, 2, 59, 37 ], [ 4, 36, 16, 4, 37, 17 ], [ 4, 36, 12, 4, 37, 13 ], [ 2, 86, 68, 2, 87, 69 ], [ 4, 69, 43, 1, 70, 44 ], [ 6, 43, 19, 2, 44, 20 ], [ 6, 43, 15, 2, 44, 16 ], [ 4, 101, 81 ], [ 1, 80, 50, 4, 81, 51 ], [ 4, 50, 22, 4, 51, 23 ], [ 3, 36, 12, 8, 37, 13 ], [ 2, 116, 92, 2, 117, 93 ], [ 6, 58, 36, 2, 59, 37 ], [ 4, 46, 20, 6, 47, 21 ], [ 7, 42, 14, 4, 43, 15 ], [ 4, 133, 107 ], [ 8, 59, 37, 1, 60, 38 ], [ 8, 44, 20, 4, 45, 21 ], [ 12, 33, 11, 4, 34, 12 ], [ 3, 145, 115, 1, 146, 116 ], [ 4, 64, 40, 5, 65, 41 ], [ 11, 36, 16, 5, 37, 17 ], [ 11, 36, 12, 5, 37, 13 ], [ 5, 109, 87, 1, 110, 88 ], [ 5, 65, 41, 5, 66, 42 ], [ 5, 54, 24, 7, 55, 25 ], [ 11, 36, 12 ], [ 5, 122, 98, 1, 123, 99 ], [ 7, 73, 45, 3, 74, 46 ], [ 15, 43, 19, 2, 44, 20 ], [ 3, 45, 15, 13, 46, 16 ], [ 1, 135, 107, 5, 136, 108 ], [ 10, 74, 46, 1, 75, 47 ], [ 1, 50, 22, 15, 51, 23 ], [ 2, 42, 14, 17, 43, 15 ], [ 5, 150, 120, 1, 151, 121 ], [ 9, 69, 43, 4, 70, 44 ], [ 17, 50, 22, 1, 51, 23 ], [ 2, 42, 14, 19, 43, 15 ], [ 3, 141, 113, 4, 142, 114 ], [ 3, 70, 44, 11, 71, 45 ], [ 17, 47, 21, 4, 48, 22 ], [ 9, 39, 13, 16, 40, 14 ], [ 3, 135, 107, 5, 136, 108 ], [ 3, 67, 41, 13, 68, 42 ], [ 15, 54, 24, 5, 55, 25 ], [ 15, 43, 15, 10, 44, 16 ], [ 4, 144, 116, 4, 145, 117 ], [ 17, 68, 42 ], [ 17, 50, 22, 6, 51, 23 ], [ 19, 46, 16, 6, 47, 17 ], [ 2, 139, 111, 7, 140, 112 ], [ 17, 74, 46 ], [ 7, 54, 24, 16, 55, 25 ], [ 34, 37, 13 ], [ 4, 151, 121, 5, 152, 122 ], [ 4, 75, 47, 14, 76, 48 ], [ 11, 54, 24, 14, 55, 25 ], [ 16, 45, 15, 14, 46, 16 ], [ 6, 147, 117, 4, 148, 118 ], [ 6, 73, 45, 14, 74, 46 ], [ 11, 54, 24, 16, 55, 25 ], [ 30, 46, 16, 2, 47, 17 ], [ 8, 132, 106, 4, 133, 107 ], [ 8, 75, 47, 13, 76, 48 ], [ 7, 54, 24, 22, 55, 25 ], [ 22, 45, 15, 13, 46, 16 ], [ 10, 142, 114, 2, 143, 115 ], [ 19, 74, 46, 4, 75, 47 ], [ 28, 50, 22, 6, 51, 23 ], [ 33, 46, 16, 4, 47, 17 ], [ 8, 152, 122, 4, 153, 123 ], [ 22, 73, 45, 3, 74, 46 ], [ 8, 53, 23, 26, 54, 24 ], [ 12, 45, 15, 28, 46, 16 ], [ 3, 147, 117, 10, 148, 118 ], [ 3, 73, 45, 23, 74, 46 ], [ 4, 54, 24, 31, 55, 25 ], [ 11, 45, 15, 31, 46, 16 ], [ 7, 146, 116, 7, 147, 117 ], [ 21, 73, 45, 7, 74, 46 ], [ 1, 53, 23, 37, 54, 24 ], [ 19, 45, 15, 26, 46, 16 ], [ 5, 145, 115, 10, 146, 116 ], [ 19, 75, 47, 10, 76, 48 ], [ 15, 54, 24, 25, 55, 25 ], [ 23, 45, 15, 25, 46, 16 ], [ 13, 145, 115, 3, 146, 116 ], [ 2, 74, 46, 29, 75, 47 ], [ 42, 54, 24, 1, 55, 25 ], [ 23, 45, 15, 28, 46, 16 ], [ 17, 145, 115 ], [ 10, 74, 46, 23, 75, 47 ], [ 10, 54, 24, 35, 55, 25 ], [ 19, 45, 15, 35, 46, 16 ], [ 17, 145, 115, 1, 146, 116 ], [ 14, 74, 46, 21, 75, 47 ], [ 29, 54, 24, 19, 55, 25 ], [ 11, 45, 15, 46, 46, 16 ], [ 13, 145, 115, 6, 146, 116 ], [ 14, 74, 46, 23, 75, 47 ], [ 44, 54, 24, 7, 55, 25 ], [ 59, 46, 16, 1, 47, 17 ], [ 12, 151, 121, 7, 152, 122 ], [ 12, 75, 47, 26, 76, 48 ], [ 39, 54, 24, 14, 55, 25 ], [ 22, 45, 15, 41, 46, 16 ], [ 6, 151, 121, 14, 152, 122 ], [ 6, 75, 47, 34, 76, 48 ], [ 46, 54, 24, 10, 55, 25 ], [ 2, 45, 15, 64, 46, 16 ], [ 17, 152, 122, 4, 153, 123 ], [ 29, 74, 46, 14, 75, 47 ], [ 49, 54, 24, 10, 55, 25 ], [ 24, 45, 15, 46, 46, 16 ], [ 4, 152, 122, 18, 153, 123 ], [ 13, 74, 46, 32, 75, 47 ], [ 48, 54, 24, 14, 55, 25 ], [ 42, 45, 15, 32, 46, 16 ], [ 20, 147, 117, 4, 148, 118 ], [ 40, 75, 47, 7, 76, 48 ], [ 43, 54, 24, 22, 55, 25 ], [ 10, 45, 15, 67, 46, 16 ], [ 19, 148, 118, 6, 149, 119 ], [ 18, 75, 47, 31, 76, 48 ], [ 34, 54, 24, 34, 55, 25 ], [ 20, 45, 15, 61, 46, 16 ] ], QRRSBlock.getRSBlocks = function(typeNumber, errorCorrectLevel) {
var rsBlock = QRRSBlock.getRsBlockTable(typeNumber, errorCorrectLevel);
if (rsBlock == undefined) throw new Error("bad rs block @ typeNumber:" + typeNumber + "/errorCorrectLevel:" + errorCorrectLevel);
var length = rsBlock.length / 3, list = [];
for (var i = 0; i < length; i++) {
var count = rsBlock[i * 3 + 0], totalCount = rsBlock[i * 3 + 1], dataCount = rsBlock[i * 3 + 2];
for (var j = 0; j < count; j++) list.push(new QRRSBlock(totalCount, dataCount));
}
return list;
}, QRRSBlock.getRsBlockTable = function(typeNumber, errorCorrectLevel) {
switch (errorCorrectLevel) {
case QRErrorCorrectLevel.L:
return QRRSBlock.RS_BLOCK_TABLE[(typeNumber - 1) * 4 + 0];
case QRErrorCorrectLevel.M:
return QRRSBlock.RS_BLOCK_TABLE[(typeNumber - 1) * 4 + 1];
case QRErrorCorrectLevel.Q:
return QRRSBlock.RS_BLOCK_TABLE[(typeNumber - 1) * 4 + 2];
case QRErrorCorrectLevel.H:
return QRRSBlock.RS_BLOCK_TABLE[(typeNumber - 1) * 4 + 3];
default:
return undefined;
}
}, QRBitBuffer.prototype = {
"get": function(index) {
var bufIndex = Math.floor(index / 8);
return (this.buffer[bufIndex] >>> 7 - index % 8 & 1) == 1;
},
"put": function(num, length) {
for (var i = 0; i < length; i++) this.putBit((num >>> length - i - 1 & 1) == 1);
},
"getLengthInBits": function() {
return this.length;
},
"putBit": function(bit) {
var bufIndex = Math.floor(this.length / 8);
this.buffer.length <= bufIndex && this.buffer.push(0), bit && (this.buffer[bufIndex] |= 128 >>> this.length % 8), this.length++;
}
};
var QRCodeLimitLength=[[17,14,11,7],[32,26,20,14],[53,42,32,24],[78,62,46,34],[106,84,60,44],[134,106,74,58],[154,122,86,64],[192,152,108,84],[230,180,130,98],[271,213,151,119],[321,251,177,137],[367,287,203,155],[425,331,241,177],[458,362,258,194],[520,412,292,220],[586,450,322,250],[644,504,364,280],[718,560,394,310],[792,624,442,338],[858,666,482,382],[929,711,509,403],[1003,779,565,439],[1091,857,611,461],[1171,911,661,511],[1273,997,715,535],[1367,1059,751,593],[1465,1125,805,625],[1528,1190,868,658],[1628,1264,908,698],[1732,1370,982,742],[1840,1452,1030,790],[1952,1538,1112,842],[2068,1628,1168,898],[2188,1722,1228,958],[2303,1809,1283,983],[2431,1911,1351,1051],[2563,1989,1423,1093],[2699,2099,1499,1139],[2809,2213,1579,1219],[2953,2331,1663,1273]];
function _isSupportCanvas() {
return typeof CanvasRenderingContext2D != "undefined";
}
// android 2.x doesn't support Data-URI spec
function _getAndroid() {
var android = false;
var sAgent = navigator.userAgent;
if (/android/i.test(sAgent)) { // android
android = true;
aMat = sAgent.toString().match(/android ([0-9]\.[0-9])/i);
if (aMat && aMat[1]) {
android = parseFloat(aMat[1]);
}
}
return android;
}
var svgDrawer = (function() {
var Drawing = function (el, htOption) {
this._el = el;
this._htOption = htOption;
};
Drawing.prototype.draw = function (oQRCode) {
var _htOption = this._htOption;
var _el = this._el;
var nCount = oQRCode.getModuleCount();
var nWidth = Math.floor(_htOption.width / nCount);
var nHeight = Math.floor(_htOption.height / nCount);
this.clear();
function makeSVG(tag, attrs) {
var el = document.createElementNS('http://www.w3.org/2000/svg', tag);
for (var k in attrs)
if (attrs.hasOwnProperty(k)) el.setAttribute(k, attrs[k]);
return el;
}
var svg = makeSVG("svg" , {'viewBox': '0 0 ' + String(nCount) + " " + String(nCount), 'width': '100%', 'height': '100%', 'fill': _htOption.colorLight});
svg.setAttributeNS("http://www.w3.org/2000/xmlns/", "xmlns:xlink", "http://www.w3.org/1999/xlink");
_el.appendChild(svg);
svg.appendChild(makeSVG("rect", {"fill": _htOption.colorDark, "width": "1", "height": "1", "id": "template"}));
for (var row = 0; row < nCount; row++) {
for (var col = 0; col < nCount; col++) {
if (oQRCode.isDark(row, col)) {
var child = makeSVG("use", {"x": String(row), "y": String(col)});
child.setAttributeNS("http://www.w3.org/1999/xlink", "href", "#template")
svg.appendChild(child);
}
}
}
};
Drawing.prototype.clear = function () {
while (this._el.hasChildNodes())
this._el.removeChild(this._el.lastChild);
};
return Drawing;
})();
var useSVG = document.documentElement.tagName.toLowerCase() === "svg";
// Drawing in DOM by using Table tag
var Drawing = useSVG ? svgDrawer : !_isSupportCanvas() ? (function () {
var Drawing = function (el, htOption) {
this._el = el;
this._htOption = htOption;
};
/**
* Draw the QRCode
*
* @param {QRCode} oQRCode
*/
Drawing.prototype.draw = function (oQRCode) {
var _htOption = this._htOption;
var _el = this._el;
var nCount = oQRCode.getModuleCount();
var nWidth = Math.floor(_htOption.width / nCount);
var nHeight = Math.floor(_htOption.height / nCount);
var aHTML = ['<table style="border:0;border-collapse:collapse;">'];
for (var row = 0; row < nCount; row++) {
aHTML.push('<tr>');
for (var col = 0; col < nCount; col++) {
aHTML.push('<td style="border:0;border-collapse:collapse;padding:0;margin:0;width:' + nWidth + 'px;height:' + nHeight + 'px;background-color:' + (oQRCode.isDark(row, col) ? _htOption.colorDark : _htOption.colorLight) + ';"></td>');
}
aHTML.push('</tr>');
}
aHTML.push('</table>');
_el.innerHTML = aHTML.join('');
// Fix the margin values as real size.
var elTable = _el.childNodes[0];
var nLeftMarginTable = (_htOption.width - elTable.offsetWidth) / 2;
var nTopMarginTable = (_htOption.height - elTable.offsetHeight) / 2;
if (nLeftMarginTable > 0 && nTopMarginTable > 0) {
elTable.style.margin = nTopMarginTable + "px " + nLeftMarginTable + "px";
}
};
/**
* Clear the QRCode
*/
Drawing.prototype.clear = function () {
this._el.innerHTML = '';
};
return Drawing;
})() : (function () { // Drawing in Canvas
function _onMakeImage() {
this._elImage.src = this._elCanvas.toDataURL("image/png");
this._elImage.style.display = "block";
this._elCanvas.style.display = "none";
}
// Android 2.1 bug workaround
// http://code.google.com/p/android/issues/detail?id=5141
if (this._android && this._android <= 2.1) {
var factor = 1 / window.devicePixelRatio;
var drawImage = CanvasRenderingContext2D.prototype.drawImage;
CanvasRenderingContext2D.prototype.drawImage = function (image, sx, sy, sw, sh, dx, dy, dw, dh) {
if (("nodeName" in image) && /img/i.test(image.nodeName)) {
for (var i = arguments.length - 1; i >= 1; i--) {
arguments[i] = arguments[i] * factor;
}
} else if (typeof dw == "undefined") {
arguments[1] *= factor;
arguments[2] *= factor;
arguments[3] *= factor;
arguments[4] *= factor;
}
drawImage.apply(this, arguments);
};
}
/**
* Check whether the user's browser supports Data URI or not
*
* @private
* @param {Function} fSuccess Occurs if it supports Data URI
* @param {Function} fFail Occurs if it doesn't support Data URI
*/
function _safeSetDataURI(fSuccess, fFail) {
var self = this;
self._fFail = fFail;
self._fSuccess = fSuccess;
// Check it just once
if (self._bSupportDataURI === null) {
var el = document.createElement("img");
var fOnError = function() {
self._bSupportDataURI = false;
if (self._fFail) {
_fFail.call(self);
}
};
var fOnSuccess = function() {
self._bSupportDataURI = true;
if (self._fSuccess) {
self._fSuccess.call(self);
}
};
el.onabort = fOnError;
el.onerror = fOnError;
el.onload = fOnSuccess;
el.src = "data:image/gif;base64,iVBORw0KGgoAAAANSUhEUgAAAAUAAAAFCAYAAACNbyblAAAAHElEQVQI12P4//8/w38GIAXDIBKE0DHxgljNBAAO9TXL0Y4OHwAAAABJRU5ErkJggg=="; // the Image contains 1px data.
return;
} else if (self._bSupportDataURI === true && self._fSuccess) {
self._fSuccess.call(self);
} else if (self._bSupportDataURI === false && self._fFail) {
self._fFail.call(self);
}
};
/**
* Drawing QRCode by using canvas
*
* @constructor
* @param {HTMLElement} el
* @param {Object} htOption QRCode Options
*/
var Drawing = function (el, htOption) {
this._bIsPainted = false;
this._android = _getAndroid();
this._htOption = htOption;
this._elCanvas = document.createElement("canvas");
this._elCanvas.width = htOption.width;
this._elCanvas.height = htOption.height;
el.appendChild(this._elCanvas);
this._el = el;
this._oContext = this._elCanvas.getContext("2d");
this._bIsPainted = false;
this._elImage = document.createElement("img");
this._elImage.alt = "Scan me!";
this._elImage.style.display = "none";
this._el.appendChild(this._elImage);
this._bSupportDataURI = null;
};
/**
* Draw the QRCode
*
* @param {QRCode} oQRCode
*/
Drawing.prototype.draw = function (oQRCode) {
var _elImage = this._elImage;
var _oContext = this._oContext;
var _htOption = this._htOption;
var nCount = oQRCode.getModuleCount();
var nWidth = _htOption.width / nCount;
var nHeight = _htOption.height / nCount;
var nRoundedWidth = Math.round(nWidth);
var nRoundedHeight = Math.round(nHeight);
_elImage.style.display = "none";
this.clear();
for (var row = 0; row < nCount; row++) {
for (var col = 0; col < nCount; col++) {
var bIsDark = oQRCode.isDark(row, col);
var nLeft = col * nWidth;
var nTop = row * nHeight;
_oContext.strokeStyle = bIsDark ? _htOption.colorDark : _htOption.colorLight;
_oContext.lineWidth = 1;
_oContext.fillStyle = bIsDark ? _htOption.colorDark : _htOption.colorLight;
_oContext.fillRect(nLeft, nTop, nWidth, nHeight);
_oContext.strokeRect(
Math.floor(nLeft) + 0.5,
Math.floor(nTop) + 0.5,
nRoundedWidth,
nRoundedHeight
);
_oContext.strokeRect(
Math.ceil(nLeft) - 0.5,
Math.ceil(nTop) - 0.5,
nRoundedWidth,
nRoundedHeight
);
}
}
this._bIsPainted = true;
};
/**
* Make the image from Canvas if the browser supports Data URI.
*/
Drawing.prototype.makeImage = function () {
if (this._bIsPainted) {
_safeSetDataURI.call(this, _onMakeImage);
}
};
/**
* Return whether the QRCode is painted or not
*
* @return {Boolean}
*/
Drawing.prototype.isPainted = function () {
return this._bIsPainted;
};
/**
* Clear the QRCode
*/
Drawing.prototype.clear = function () {
this._oContext.clearRect(0, 0, this._elCanvas.width, this._elCanvas.height);
this._bIsPainted = false;
};
/**
* @private
* @param {Number} nNumber
*/
Drawing.prototype.round = function (nNumber) {
if (!nNumber) {
return nNumber;
}
return Math.floor(nNumber * 1000) / 1000;
};
return Drawing;
})();
/**
* Get the type by string length
*
* @private
* @param {String} sText
* @param {Number} nCorrectLevel
* @return {Number} type
*/
function _getTypeNumber(sText, nCorrectLevel) {
var nType = 1;
var length = _getUTF8Length(sText);
for (var i = 0, len = QRCodeLimitLength.length; i <= len; i++) {
var nLimit = 0;
switch (nCorrectLevel) {
case QRErrorCorrectLevel.L :
nLimit = QRCodeLimitLength[i][0];
break;
case QRErrorCorrectLevel.M :
nLimit = QRCodeLimitLength[i][1];
break;
case QRErrorCorrectLevel.Q :
nLimit = QRCodeLimitLength[i][2];
break;
case QRErrorCorrectLevel.H :
nLimit = QRCodeLimitLength[i][3];
break;
}
if (length <= nLimit) {
break;
} else {
nType++;
}
}
if (nType > QRCodeLimitLength.length) {
throw new Error("Too long data");
}
return nType;
}
function _getUTF8Length(sText) {
var replacedText = encodeURI(sText).toString().replace(/\%[0-9a-fA-F]{2}/g, 'a');
return replacedText.length + (replacedText.length != sText ? 3 : 0);
}
/**
* @class QRCode
* @constructor
* @example
* new QRCode(document.getElementById("test"), "http://jindo.dev.naver.com/collie");
*
* @example
* var oQRCode = new QRCode("test", {
* text : "http://naver.com",
* width : 128,
* height : 128
* });
*
* oQRCode.clear(); // Clear the QRCode.
* oQRCode.makeCode("http://map.naver.com"); // Re-create the QRCode.
*
* @param {HTMLElement|String} el target element or 'id' attribute of element.
* @param {Object|String} vOption
* @param {String} vOption.text QRCode link data
* @param {Number} [vOption.width=256]
* @param {Number} [vOption.height=256]
* @param {String} [vOption.colorDark="#000000"]
* @param {String} [vOption.colorLight="#ffffff"]
* @param {QRCode.CorrectLevel} [vOption.correctLevel=QRCode.CorrectLevel.H] [L|M|Q|H]
*/
QRCode = function (el, vOption) {
this._htOption = {
width : 256,
height : 256,
typeNumber : 4,
colorDark : "#000000",
colorLight : "#ffffff",
correctLevel : QRErrorCorrectLevel.H
};
if (typeof vOption === 'string') {
vOption = {
text : vOption
};
}
// Overwrites options
if (vOption) {
for (var i in vOption) {
this._htOption[i] = vOption[i];
}
}
if (typeof el == "string") {
el = document.getElementById(el);
}
this._android = _getAndroid();
this._el = el;
this._oQRCode = null;
this._oDrawing = new Drawing(this._el, this._htOption);
if (this._htOption.text) {
this.makeCode(this._htOption.text);
}
};
/**
* Make the QRCode
*
* @param {String} sText link data
*/
QRCode.prototype.makeCode = function (sText) {
this._oQRCode = new QRCodeModel(_getTypeNumber(sText, this._htOption.correctLevel), this._htOption.correctLevel);
this._oQRCode.addData(sText);
this._oQRCode.make();
this._el.title = sText;
this._oDrawing.draw(this._oQRCode);
this.makeImage();
};
/**
* Make the Image from Canvas element
* - It occurs automatically
* - Android below 3 doesn't support Data-URI spec.
*
* @private
*/
QRCode.prototype.makeImage = function () {
if (typeof this._oDrawing.makeImage == "function" && (!this._android || this._android >= 3)) {
this._oDrawing.makeImage();
}
};
/**
* Clear the QRCode
*/
QRCode.prototype.clear = function () {
this._el.innerHTML = '';
this._oDrawing.clear();
};
/**
* @name QRCode.CorrectLevel
*/
QRCode.CorrectLevel = QRErrorCorrectLevel;
})();
QRCode for JavaScript
另外，推荐使用 JsBarcode 生成条形码，也是纯js，不依赖jquery，非常方便！
纯js生成QRCode的更多相关文章
- 纯js生成验证码
实现代码: <html xmlns="http://www.w3.org/1999/xhtml"> <head runat="server"& ...
- jquery.qrcode.min.js生成二维码 通过前端实现二维码生成
主体代码: <!DOCTYPE HTML> <html> <head> <meta charset="utf-8"> <tit ...
- （转）js jquery.qrcode生成二维码 带logo 支持中文
场景:公司最最近在开发二维码支付业务,所以需要做一个html5中的二维码生成和部署! 前天用js生成二维码,节省服务器资源及带宽 原版jquery.qrcode不能生成logo,本文采用的是修改版 1 ...
- 使用jquery.qrcode.js生成二维码
通常生成二维码的方式有两种:第一种是java代码的形式,第二种是通过Js方式. 在这里我做个记录,用js生成二维码,可以在官网下载源码:http://jeromeetienne.github.io/j ...
- js生成二维码 qrcode
js生成二维码 QRcode npm 地址 1.安装qrcode //在项目文件夹中执行: npm install --save qrcode //或者,将其全局安装以使用qrcode命令行来保存qr ...
- QRCode.js生成二维码
QRCode的GitHub地址: https://github.com/KeeeX/qrcodejs 该版本解决了主版本(https://github.com/davidshimjs/qrcodejs ...
- 【QRcode二维码】：使用JS前端插件QRcode.js生成二维码
1.先简单说一下jquery-qrcode,这个开源的三方库(可以从https://github.com/jeromeetienne/jquery-qrcode 获取), qrcode.js 是实现二 ...
- js生成二维码的jquery组件–qrcode
js生成二维码的jquery组件–qrcode 2015/01/30 / 2508 VIEWS / JAVASCRIPT, JQUERY 有一些耗cpu的计算,完全可以在客户端上计算,比如生成二维码. ...
- qrcode——js生成二维码
1.引入 qrcode.min.js(点击下载demo) 2.html: <div id="qrcode"></div> js: var qrcode = ...
随机推荐
- HDU 3613 扩展KMP
暴力枚举大水题,判断回文,扩展KMP #include <cstdio> #include <cstring> #include <algorithm> using ...
- 动态规划(DP),0-1背包问题
题目链接:http://poj.org/problem?id=3624 1.p[i][j]表示,背包容量为j,从i,i+1,i+2,...,n的最优解. 2.递推公式 p[i][j]=max(p[i+ ...
- [19/03/18-星期一] 常用类_Math(数学)类&Rondom(随机数)类
一.Math(数学)类(单独一个Java.Math 包中) java.lang.Math提供了一系列静态方法用于科学计算;其方法的参数和返回值类型一般为double型.如果需要更加强大的数学运算能力, ...
- jmeter自动生成测试报告
环境要求1:jmeter3.0版本之后开始支持动态生成测试报表 2:jdk版本1.7以上 3:需要jmx脚本文件 基本操作 1:在你的脚本文件路径下,执行cmd命令:jmeter -n -t test ...
- html基本代码书写
html的书写: datagrid---->toolbar---->按钮---->handler:function() var rows=$("gridId"). ...
- asp.net 过滤器
asp.net 制作过滤器原理:重写ASP.net管道事件 1.通过HttpApplicationFactory创建一个HttpApplication对象,负责处理整个请求. 2.调用ProcessR ...
- Android学习笔记_57_ExpandableListView控件应用
1.布局文件: <?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:andr ...
- 快速排序_C语言_数组
快速排序_C语言_数组 #include <stdio.h> void quickSort(int *, int, int); int searchPos(int *, int, int) ...
- MySQL提升课程 全面讲解MySQL架构设计-索引
索引是什么? 索引是帮助MySQL高效获取数据的数据结构. 索引能干什么? 提高数据查询的效率. 索引:排好序的快速查找数据结构!索引会影响where后面的查找,和order by 后面的排序. 一. ...
- ethereum(以太坊)(基础)--容易忽略的坑(一)
pragma solidity ^0.4.0; contract base{ address public _owner=msg.sender; uint _a; string internal _b ...