二维码解析：使用 JavaScript 库reqrcode.js解析二维码
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二维码解析：使用 JavaScript 库reqrcode.js解析二维码
小編覺得挺不錯的,現在分享給大家,幫大家做個參考.
上次使用QRCode.js可以來生成二維碼，但是我沒有找到有文檔說明可以對存在的二維碼進行掃描解析其中的內容。
幸虧查找到了可行的解決方案，而且很好使哦！就是reqrcode.js
地址：https://gitee.com/weijunw/erweima/tree/master
reqrcode.js
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b,g){varj=g-3.5;vari;varf;vare;varc;if(b!=null){i=b.X;f=b.Y;e=c=j-3}else{i=(h.X-l.X)+k.X;f=(h.Y-l.Y)+k.Y;e=c=j}vard=_ae._ag(3.5,3.5,j,3.5,e,c,3.5,j,l.X,l.Y,h.X,h.Y,i,f,k.X,k.Y);returnd};this._bz=function(e,b,d){varc=_aa;returnc._af(e,d,b)};this._cd=function(q){varj=q._gq;varh=q._gs;varn=q._gp;vard=this._bk(j,h,n);if(d<1){throw"Error"}varr=this._bx(j,h,n,d);varb=_a3._at(r);vark=b._cr-7;varl=null;if(b._as.length>0){varf=h.X-j.X+n.X;vare=h.Y-j.Y+n.Y;varc=1-3/k;vart=Math.floor(j.X+c*(f-j.X));vars=Math.floor(j.Y+c*(e-j.Y));for(varp=4;p<=16;p<<=1){l=this._bl(d,t,s,p);break}}varg=this.createTransform(j,h,n,l,r);varm=this._bz(this.image,g,r);varo;if(l==null){o=newArray(n,j,h)}else{o=newArray(n,j,h,l)}returnnew_bg(m,o)};this.detect=function(){varb=new_cc()._ce(this.image);returnthis._cd(b)}}var_ca=21522;var_cb=newArray(newArray(21522,0),newArray(20773,1),newArray(24188,2),newArray(23371,3),newArray(17913,4),newArray(16590,5),newArray(20375,6),newArray(19104,7),newArray(30660,8),newArray(29427,9),newArray(32170,10),newArray(30877,11),newArray(26159,12),newArray(25368,13),newArray(27713,14),newArray(26998,15),newArray(5769,16),newArray(5054,17),newArray(7399,18),newArray(6608,19),newArray(1890,20),newArray(597,21),newArray(3340,22),newArray(2107,23),newArray(13663,24),newArray(12392,25),newArray(16177,26),newArray(14854,27),newArray(9396,28),newArray(8579,29),newArray(11994,30),newArray(11245,31));var_ch=newArray(0,1,1,2,1,2,2,3,1,2,2,3,2,3,3,4);function_ax(a){this._cf=_cg.forBits((a>>3)&3);this._fe=(a&7);this.__defineGetter__("_cg",function(){returnthis._cf});this.__defineGetter__("_dx",function(){returnthis._fe});this.GetHashCode=function(){return(this._cf.ordinal()<<3)|_fe};this.Equals=function(c){varb=c;returnthis._cf==b._cf&&this._fe==b._fe}}_ax._gj=function(d,c){d^=c;return_ch[d&15]+_ch[(_ew(d,4)&15)]+_ch[(_ew(d,8)&15)]+_ch[(_ew(d,12)&15)]+_ch[(_ew(d,16)&15)]+_ch[(_ew(d,20)&15)]+_ch[(_ew(d,24)&15)]+_ch[(_ew(d,28)&15)]};_ax._ci=function(a){var 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1);for(varg=0;g<h.length;g++){h[g]=0}h[0]=f;returnnew_bp(this,h)};this.exp=function(f){returnthis._gh[f]};this.log=function(f){if(f==0){throw"badarguments"}returnthis._gi[f]};this.inverse=function(f){if(f==0){throw"System.ArithmeticException"}returnthis._gh[255-this._gi[f]]};this.multiply=function(g,f){if(g==0||f==0){return0}if(g==1){returnf}if(f==1){returng}returnthis._gh[(this._gi[g]+this._gi[f])%255]}}_az._bb=new_az(285);_az._bc=new_az(301);_az._bd=function(d,c){returnd^c};varDecoder={};Decoder.rsDecoder=new_db(_az._bb);Decoder.correctErrors=function(g,b){vard=g.length;varf=newArray(d);for(vare=0;e<d;e++){f[e]=g[e]&255}vara=g.length-b;try{Decoder.rsDecoder.decode(f,a)}catch(c){throwc}for(vare=0;e<b;e++){g[e]=f[e]}};Decoder.decode=function(q){varb=new_cl(q);varo=b._cq();varc=b._cm()._cg;varp=b._gk();vara=_dl._gn(p,o,c);varf=0;for(vark=0;k<a.length;k++){f+=a[k]._du}vare=newArray(f);varn=0;for(varh=0;h<a.length;h++){varm=a[h];vard=m.Codewords;varg=m._du;Decoder.correctErrors(d,g);for(vark=0;k<g;k++){e[n++]=d[k]}}varl=newQRCodeDataBlockReader(e,o._fd,c.Bits);returnl};varqrcode={};qrcode.imagedata=null;qrcode.width=0;qrcode.height=0;qrcode.qrCodeSymbol=null;qrcode.debug=false;qrcode.maxImgSize=1024*1024;qrcode._eo=[[10,9,8,8],[12,11,16,10],[14,13,16,12]];qrcode.callback=null;qrcode.vidSuccess=function(a){qrcode.localstream=a;if(qrcode.webkit){qrcode.video.src=window.webkitURL.createObjectURL(a)}else{if(qrcode.moz){qrcode.video.mozSrcObject=a;qrcode.video.play()}else{qrcode.video.src=a}}qrcode.gUM=true;qrcode.canvas_qr2=document.createElement("canvas");qrcode.canvas_qr2.id="qr-canvas";qrcode.qrcontext2=qrcode.canvas_qr2.getContext("2d");qrcode.canvas_qr2.width=qrcode.video.videoWidth;qrcode.canvas_qr2.height=qrcode.video.videoHeight;setTimeout(qrcode.captureToCanvas,500)};qrcode.vidError=function(a){qrcode.gUM=false;return};qrcode.captureToCanvas=function(){if(qrcode.gUM){try{if(qrcode.video.videoWidth==0){setTimeout(qrcode.captureToCanvas,500);return}else{qrcode.canvas_qr 2.width=qrcode.video.videoWidth;qrcode.canvas_qr2.height=qrcode.video.videoHeight}qrcode.qrcontext2.drawImage(qrcode.video,0,0);try{qrcode.decode()}catch(a){console.log(a);setTimeout(qrcode.captureToCanvas,500)}}catch(a){console.log(a);setTimeout(qrcode.captureToCanvas,500)}}};qrcode.setWebcam=function(c){vard=navigator;qrcode.video=document.getElementById(c);vara=true;if(navigator.mediaDevices&&navigator.mediaDevices.enumerateDevices){try{navigator.mediaDevices.enumerateDevices().then(function(e){e.forEach(function(f){console.log("deb1");if(f.kind==="videoinput"){if(f.label.toLowerCase().search("back")>-1){a=[{sourceId:f.deviceId}]}}console.log(f.kind+":"+f.label+"id="+f.deviceId)})})}catch(b){console.log(b)}}else{console.log("nonavigator.mediaDevices.enumerateDevices")}if(d.getUserMedia){d.getUserMedia({video:a,audio:false},qrcode.vidSuccess,qrcode.vidError)}else{if(d.webkitGetUserMedia){qrcode.webkit=true;d.webkitGetUserMedia({video:a,audio:false},qrcode.vidSuccess,qrcode.vidError)}else{if(d.mozGetUserMedia){qrcode.moz=true;d.mozGetUserMedia({video:a,audio:false},qrcode.vidSuccess,qrcode.vidError)}}}};qrcode.decode=function(d){if(arguments.length==0){if(qrcode.canvas_qr2){varb=qrcode.canvas_qr2;vara=qrcode.qrcontext2}else{varb=document.getElementById("qr-canvas");vara=b.getContext("2d")}qrcode.width=b.width;qrcode.height=b.height;qrcode.imagedata=a.getImageData(0,0,qrcode.width,qrcode.height);qrcode.result=qrcode.process(a);if(qrcode.callback!=null){qrcode.callback(qrcode.result)}returnqrcode.result}else{varc=newImage();c.crossOrigin="Anonymous";c.onload=function(){varg=document.getElementById("out-canvas");if(g!=null){varj=g.getContext("2d");j.clearRect(0,0,320,240);j.drawImage(c,0,0,320,240)}vari=document.createElement("canvas");varh=i.getContext("2d");varf=c.height;varl=c.width;if(c.width*c.height>qrcode.maxImgSize){vark=c.width/c.height;f=Math.sqrt(qrcode.maxImgSize/k);l=k*f}i.width=l;i.height=f;h.drawImage(c,0,0,i.width,i.height);qrcode.width=i.width;qrcode.height=i.height;try{qrcode .imagedata=h.getImageData(0,0,i.width,i.height)}catch(m){qrcode.result="Crossdomainimagereadingnotsupportedinyourbrowser!Saveittoyourcomputerthendraganddropthefile!";if(qrcode.callback!=null){qrcode.callback(qrcode.result)}return}try{qrcode.result=qrcode.process(h)}catch(m){console.log(m);qrcode.result="errordecodingQRCode"}if(qrcode.callback!=null){qrcode.callback(qrcode.result)}};c.onerror=function(){if(qrcode.callback!=null){qrcode.callback("Failedtoloadtheimage")}};c.src=d}};qrcode.isUrl=function(a){varb=/(ftp|http|https)://(w+:{0,1}w*@)?(S+)(:[0-9]+)?(/|/([w#!:.?+=&%@!-/]))?/;returnb.test(a)};qrcode.decode_url=function(b){vard="";try{d=escape(b)}catch(c){console.log(c);d=b}vara="";try{a=decodeURIComponent(d)}catch(c){console.log(c);a=d}returna};qrcode.decode_utf8=function(a){if(qrcode.isUrl(a)){returnqrcode.decode_url(a)}else{returna}};qrcode.process=function(q){vara=newDate().getTime();varc=qrcode.grayScaleToBitmap(qrcode.grayscale());if(qrcode.debug){for(varm=0;m<qrcode.height;m++){for(varn=0;n<qrcode.width;n++){varo=(n*4)+(m*qrcode.width*4);qrcode.imagedata.data[o]=c[n+m*qrcode.width]?0:0;qrcode.imagedata.data[o+1]=c[n+m*qrcode.width]?0:0;qrcode.imagedata.data[o+2]=c[n+m*qrcode.width]?255:0}}q.putImageData(qrcode.imagedata,0,0)}varh=newDetector(c);varp=h.detect();if(qrcode.debug){for(varm=0;m<p.bits.Height;m++){for(varn=0;n<p.bits.Width;n++){varo=(n*4*2)+(m*2*qrcode.width*4);qrcode.imagedata.data[o]=p.bits._ds(n,m)?0:0;qrcode.imagedata.data[o+1]=p.bits._ds(n,m)?0:0;qrcode.imagedata.data[o+2]=p.bits._ds(n,m)?255:0}}q.putImageData(qrcode.imagedata,0,0)}vark=Decoder.decode(p.bits);varg=k.DataByte;varl="";for(varf=0;f<g.length;f++){for(vare=0;e<g[f].length;e++){l+=String.fromCharCode(g[f][e])}}vard=newDate().getTime();varb=d-a;console.log(b);returnqrcode.decode_utf8(l)};qrcode.getPixel=function(b,d){if(qrcode.width<b){throw"pointerror"}if(qrcode.height<d){throw"pointerror"}vara=(b*4)+(d*qrcode.width*4);varc=(qrcode.imagedata.data[a]*33+qrcod e.imagedata.data[a+1]*34+qrcode.imagedata.data[a+2]*33)/100;returnc};qrcode.binarize=function(d){varc=newArray(qrcode.width*qrcode.height);for(vare=0;e<qrcode.height;e++){for(varb=0;b<qrcode.width;b++){vara=qrcode.getPixel(b,e);c[b+e*qrcode.width]=a<=d?true:false}}returnc};qrcode._em=function(d){varc=4;vark=Math.floor(qrcode.width/c);varj=Math.floor(qrcode.height/c);varf=newArray(c);for(varg=0;g<c;g++){f[g]=newArray(c);for(vare=0;e<c;e++){f[g][e]=newArray(0,0)}}for(varo=0;o<c;o++){for(vara=0;a<c;a++){f[a][o][0]=255;for(varl=0;l<j;l++){for(varn=0;n<k;n++){varh=d[k*a+n+(j*o+l)*qrcode.width];if(h<f[a][o][0]){f[a][o][0]=h}if(h>f[a][o][1]){f[a][o][1]=h}}}}}varm=newArray(c);for(varb=0;b<c;b++){m[b]=newArray(c)}for(varo=0;o<c;o++){for(vara=0;a<c;a++){m[a][o]=Math.floor((f[a][o][0]+f[a][o][1])/2)}}returnm};qrcode.grayScaleToBitmap=function(f){vark=qrcode._em(f);varb=k.length;vare=Math.floor(qrcode.width/b);vard=Math.floor(qrcode.height/b);varh=newArrayBuffer(qrcode.width*qrcode.height);varc=newUint8Array(h);for(varj=0;j<b;j++){for(vara=0;a<b;a++){for(varg=0;g<d;g++){for(vari=0;i<e;i++){c[e*a+i+(d*j+g)*qrcode.width]=(f[e*a+i+(d*j+g)*qrcode.width]<k[a][j])?true:false}}}}returnc};qrcode.grayscale=function(){vare=newArrayBuffer(qrcode.width*qrcode.height);varc=newUint8Array(e);for(vard=0;d<qrcode.height;d++){for(varb=0;b<qrcode.width;b++){vara=qrcode.getPixel(b,d);c[b+d*qrcode.width]=a}}returnc};function_ew(a,b){if(a>=0){returna>>b}else{return(a>>b)+(2<<~b)}}var_gf=3;var_eh=57;var_el=8;var_eg=2;qrcode._er=function(c){functionb(m,k){varn=m.X-k.X;varl=m.Y-k.Y;returnMath.sqrt((n*n+l*l))}functiond(k,o,n){varm=o.x;varl=o.y;return((n.x-m)*(k.y-l))-((n.y-l)*(k.x-m))}vari=b(c[0],c[1]);varf=b(c[1],c[2]);vare=b(c[0],c[2]);vara,j,h;if(f>=i&&f>=e){j=c[0];a=c[1];h=c[2]}else{if(e>=f&&e>=i){j=c[1];a=c[0];h=c[2]}else{j=c[2];a=c[0];h=c[1]}}if(d(a,j,h)<0){varg=a;a=h;h=g}c[0]=a;c[1]=j;c[2]=h};function_cz(c,a,b){this.x=c;this.y=a;this.count=1;this._aj=b;this.__defineGetter__(" _ei",function(){returnthis._aj});this.__defineGetter__("Count",function(){returnthis.count});this.__defineGetter__("X",function(){returnthis.x});this.__defineGetter__("Y",function(){returnthis.y});this._ek=function(){this.count++};this._ev=function(f,e,d){if(Math.abs(e-this.y)<=f&&Math.abs(d-this.x)<=f){varg=Math.abs(f-this._aj);returng<=1||g/this._aj<=1}returnfalse}}function_es(a){this._go=a[0];this._gu=a[1];this._gr=a[2];this.__defineGetter__("_gp",function(){returnthis._go});this.__defineGetter__("_gq",function(){returnthis._gu});this.__defineGetter__("_gs",function(){returnthis._gr})}function_cc(){this.image=null;this._cv=[];this._ge=false;this._al=newArray(0,0,0,0,0);this._am=null;this.__defineGetter__("_da",function(){this._al[0]=0;this._al[1]=0;this._al[2]=0;this._al[3]=0;this._al[4]=0;returnthis._al});this._ao=function(f){varb=0;for(vard=0;d<5;d++){vare=f[d];if(e==0){returnfalse}b+=e}if(b<7){returnfalse}varc=Math.floor((b<<_el)/7);vara=Math.floor(c/2);returnMath.abs(c-(f[0]<<_el))<a&&Math.abs(c-(f[1]<<_el))<a&&Math.abs(3*c-(f[2]<<_el))<3*a&&Math.abs(c-(f[3]<<_el))<a&&Math.abs(c-(f[4]<<_el))<a};this._an=function(b,a){return(a-b[4]-b[3])-b[2]/2};this._ap=function(a,j,d,g){varc=this.image;varh=qrcode.height;varb=this._da;varf=a;while(f>=0&&c[j+f*qrcode.width]){b[2]++;f--}if(f<0){returnNaN}while(f>=0&&!c[j+f*qrcode.width]&&b[1]<=d){b[1]++;f--}if(f<0||b[1]>d){returnNaN}while(f>=0&&c[j+f*qrcode.width]&&b[0]<=d){b[0]++;f--}if(b[0]>d){returnNaN}f=a+1;while(f<h&&c[j+f*qrcode.width]){b[2]++;f++}if(f==h){returnNaN}while(f<h&&!c[j+f*qrcode.width]&&b[3]<d){b[3]++;f++}if(f==h||b[3]>=d){returnNaN}while(f<h&&c[j+f*qrcode.width]&&b[4]<d){b[4]++;f++}if(b[4]>=d){returnNaN}vare=b[0]+b[1]+b[2]+b[3]+b[4];if(5*Math.abs(e-g)>=2*g){returnNaN}returnthis._ao(b)?this._an(b,f):NaN};this._ej=function(b,a,e,h){vard=this.image;vari=qrcode.width;varc=this._da;varg=b;while(g>=0&&d[g+a*qrcode.width]){c[2]++;g--}if(g<0){returnNaN}while(g>=0&&!d[g+a*qrcode.width]&&c[1]<=e){c[1]++;g--}if(g<0||c[1]>e){r eturnNaN}while(g>=0&&d[g+a*qrcode.width]&&c[0]<=e){c[0]++;g--}if(c[0]>e){returnNaN}g=b+1;while(g<i&&d[g+a*qrcode.width]){c[2]++;g++}if(g==i){returnNaN}while(g<i&&!d[g+a*qrcode.width]&&c[3]<e){c[3]++;g++}if(g==i||c[3]>=e){returnNaN}while(g<i&&d[g+a*qrcode.width]&&c[4]<e){c[4]++;g++}if(c[4]>=e){returnNaN}varf=c[0]+c[1]+c[2]+c[3]+c[4];if(5*Math.abs(f-h)>=h){returnNaN}returnthis._ao(c)?this._an(c,g):NaN};this._cu=function(c,f,e){vard=c[0]+c[1]+c[2]+c[3]+c[4];varn=this._an(c,e);varb=this._ap(f,Math.floor(n),c[2],d);if(!isNaN(b)){n=this._ej(Math.floor(n),Math.floor(b),c[2],d);if(!isNaN(n)){varl=d/7;varm=false;varh=this._cv.length;for(varg=0;g<h;g++){vara=this._cv[g];if(a._ev(l,b,n)){a._ek();m=true;break}}if(!m){vark=new_cz(n,b,l);this._cv.push(k);if(this._am!=null){this._am._ep(k)}}returntrue}}returnfalse};this._ee=function(){varh=this._cv.length;if(h<3){throw"Couldn'tfindenoughfinderpatterns(found"+h+")"}if(h>3){varb=0;varj=0;for(vard=0;d<h;d++){varg=this._cv[d]._ei;b+=g;j+=(g*g)}vara=b/h;this._cv.sort(function(m,l){vark=Math.abs(l._ei-a);vari=Math.abs(m._ei-a);if(k<i){return(-1)}else{if(k==i){return0}else{return1}}});vare=Math.sqrt(j/h-a*a);varc=Math.max(0.2*a,e);for(vard=this._cv.length-1;d>=0;d--){varf=this._cv[d];if(Math.abs(f._ei-a)>c){this._cv.splice(d,1)}}}if(this._cv.length>3){this._cv.sort(function(k,i){if(k.count>i.count){return-1}if(k.count<i.count){return1}return0})}returnnewArray(this._cv[0],this._cv[1],this._cv[2])};this._eq=function(){varb=this._cv.length;if(b<=1){return0}varc=null;for(vard=0;d<b;d++){vara=this._cv[d];if(a.Count>=_eg){if(c==null){c=a}else{this._ge=true;returnMath.floor((Math.abs(c.X-a.X)-Math.abs(c.Y-a.Y))/2)}}}return0};this._cx=function(){varg=0;varc=0;vara=this._cv.length;for(vard=0;d<a;d++){varf=this._cv[d];if(f.Count>=_eg){g++;c+=f._ei}}if(g<3){returnfalse}vare=c/a;varb=0;for(vard=0;d<a;d++){f=this._cv[d];b+=Math.abs(f._ei-e)}returnb<=0.05*c};this._ce=function(e){varo=false;this.image=e;varn=qrcode.height;vark=qrcode. width;vara=Math.floor((3*n)/(4*_eh));if(a<_gf||o){a=_gf}varg=false;vard=newArray(5);for(varh=a-1;h<n&&!g;h+=a){d[0]=0;d[1]=0;d[2]=0;d[3]=0;d[4]=0;varb=0;for(varf=0;f<k;f++){if(e[f+h*qrcode.width]){if((b&1)==1){b++}d[b]++}else{if((b&1)==0){if(b==4){if(this._ao(d)){varc=this._cu(d,h,f);if(c){a=2;if(this._ge){g=this._cx()}else{varm=this._eq();if(m>d[2]){h+=m-d[2]-a;f=k-1}}}else{do{f++}while(f<k&&!e[f+h*qrcode.width]);f--}b=0;d[0]=0;d[1]=0;d[2]=0;d[3]=0;d[4]=0}else{d[0]=d[2];d[1]=d[3];d[2]=d[4];d[3]=1;d[4]=0;b=3}}else{d[++b]++}}else{d[b]++}}}if(this._ao(d)){varc=this._cu(d,h,k);if(c){a=d[0];if(this._ge){g=_cx()}}}}varl=this._ee();qrcode._er(l);returnnew_es(l)}}function_ai(c,a,b){this.x=c;this.y=a;this.count=1;this._aj=b;this.__defineGetter__("_ei",function(){returnthis._aj});this.__defineGetter__("Count",function(){returnthis.count});this.__defineGetter__("X",function(){returnMath.floor(this.x)});this.__defineGetter__("Y",function(){returnMath.floor(this.y)});this._ek=function(){this.count++};this._ev=function(f,e,d){if(Math.abs(e-this.y)<=f&&Math.abs(d-this.x)<=f){varg=Math.abs(f-this._aj);returng<=1||g/this._aj<=1}returnfalse}}function_ak(g,c,b,f,a,e,d){this.image=g;this._cv=newArray();this.startX=c;this.startY=b;this.width=f;this.height=a;this._ef=e;this._al=newArray(0,0,0);this._am=d;this._an=function(i,h){return(h-i[2])-i[1]/2};this._ao=function(l){vark=this._ef;varh=k/2;for(varj=0;j<3;j++){if(Math.abs(k-l[j])>=h){returnfalse}}returntrue};this._ap=function(h,q,l,o){vark=this.image;varp=qrcode.height;varj=this._al;j[0]=0;j[1]=0;j[2]=0;varn=h;while(n>=0&&k[q+n*qrcode.width]&&j[1]<=l){j[1]++;n--}if(n<0||j[1]>l){returnNaN}while(n>=0&&!k[q+n*qrcode.width]&&j[0]<=l){j[0]++;n--}if(j[0]>l){returnNaN}n=h+1;while(n<p&&k[q+n*qrcode.width]&&j[1]<=l){j[1]++;n++}if(n==p||j[1]>l){returnNaN}while(n<p&&!k[q+n*qrcode.width]&&j[2]<=l){j[2]++;n++}if(j[2]>l){returnNaN}varm=j[0]+j[1]+j[2];if(5*Math.abs(m-o)>=2*o){returnNaN}returnthis._ao(j)?this._an(j,n):NaN};this._cu=function(l,o,n){varm=l[0 ]+l[1]+l[2];vart=this._an(l,n);vark=this._ap(o,Math.floor(t),2*l[1],m);if(!isNaN(k)){vars=(l[0]+l[1]+l[2])/3;varq=this._cv.length;for(varp=0;p<q;p++){varh=this._cv[p];if(h._ev(s,k,t)){returnnew_ai(t,k,s)}}varr=new_ai(t,k,s);this._cv.push(r);if(this._am!=null){this._am._ep(r)}}returnnull};this.find=function(){varp=this.startX;vars=this.height;varq=p+f;varr=b+(s>>1);varm=newArray(0,0,0);for(vark=0;k<s;k++){varo=r+((k&1)==0?((k+1)>>1):-((k+1)>>1));m[0]=0;m[1]=0;m[2]=0;varn=p;while(n<q&&!g[n+qrcode.width*o]){n++}varh=0;while(n<q){if(g[n+o*qrcode.width]){if(h==1){m[h]++}else{if(h==2){if(this._ao(m)){varl=this._cu(m,o,n);if(l!=null){returnl}}m[0]=m[2];m[1]=1;m[2]=0;h=1}else{m[++h]++}}}else{if(h==1){h++}m[h]++}n++}if(this._ao(m)){varl=this._cu(m,o,q);if(l!=null){returnl}}}if(!(this._cv.length==0)){returnthis._cv[0]}throw"Couldn'tfindenoughalignmentpatterns"}}functionQRCodeDataBlockReader(c,a,b){this._ed=0;this._cw=7;this.dataLength=0;this.blocks=c;this._en=b;if(a<=9){this.dataLengthMode=0}else{if(a>=10&&a<=26){this.dataLengthMode=1}else{if(a>=27&&a<=40){this.dataLengthMode=2}}}this._gd=function(f){vark=0;if(f<this._cw+1){varm=0;for(vare=0;e<f;e++){m+=(1<<e)}m<<=(this._cw-f+1);k=(this.blocks[this._ed]&m)>>(this._cw-f+1);this._cw-=f;returnk}else{if(f<this._cw+1+8){varj=0;for(vare=0;e<this._cw+1;e++){j+=(1<<e)}k=(this.blocks[this._ed]&j)<<(f-(this._cw+1));this._ed++;k+=((this.blocks[this._ed])>>(8-(f-(this._cw+1))));this._cw=this._cw-f%8;if(this._cw<0){this._cw=8+this._cw}returnk}else{if(f<this._cw+1+16){varj=0;varh=0;for(vare=0;e<this._cw+1;e++){j+=(1<<e)}varg=(this.blocks[this._ed]&j)<<(f-(this._cw+1));this._ed++;vard=this.blocks[this._ed]<<(f-(this._cw+1+8));this._ed++;for(vare=0;e<f-(this._cw+1+8);e++){h+=(1<<e)}h<<=8-(f-(this._cw+1+8));varl=(this.blocks[this._ed]&h)>>(8-(f-(this._cw+1+8)));k=g+d+l;this._cw=this._cw-(f-8)%8;if(this._cw<0){this._cw=8+this._cw}returnk}else{return0}}}};this.NextMode=function(){if((this._ed>this.blocks.length-this._en-2)){return0}else{return this._gd(4)}};this.getDataLength=function(d){vare=0;while(true){if((d>>e)==1){break}e++}returnthis._gd(qrcode._eo[this.dataLengthMode][e])};this.getRomanAndFigureString=function(h){varf=h;varg=0;varj="";vard=newArray("0","1","2","3","4","5","6","7","8","9","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","","$","%","*","+","-",".","/",":");do{if(f>1){g=this._gd(11);vari=Math.floor(g/45);vare=g%45;j+=d[i];j+=d[e];f-=2}else{if(f==1){g=this._gd(6);j+=d[g];f-=1}}}while(f>0);returnj};this.getFigureString=function(f){vard=f;vare=0;varg="";do{if(d>=3){e=this._gd(10);if(e<100){g+="0"}if(e<10){g+="0"}d-=3}else{if(d==2){e=this._gd(7);if(e<10){g+="0"}d-=2}else{if(d==1){e=this._gd(4);d-=1}}}g+=e}while(d>0);returng};this.get8bitByteArray=function(g){vare=g;varf=0;vard=newArray();do{f=this._gd(8);d.push(f);e--}while(e>0);returnd};this.getKanjiString=function(j){varg=j;vari=0;varh="";do{i=_gd(13);vare=i%192;varf=i/192;vark=(f<<8)+e;vard=0;if(k+33088<=40956){d=k+33088}else{d=k+49472}h+=String.fromCharCode(d);g--}while(g>0);returnh};this.__defineGetter__("DataByte",function(){varh=newArray();vare=1;varf=2;vard=4;varo=8;do{varl=this.NextMode();if(l==0){if(h.length>0){break}else{throw"Emptydatablock"}}if(l!=e&&l!=f&&l!=d&&l!=o){throw"Invalidmode:"+l+"in(block:"+this._ed+"bit:"+this._cw+")"}varg=this.getDataLength(l);if(g<1){throw"Invaliddatalength:"+g}switch(l){casee:varm=this.getFigureString(g);vark=newArray(m.length);for(vari=0;i<m.length;i++){k[i]=m.charCodeAt(i)}h.push(k);break;casef:varm=this.getRomanAndFigureString(g);vark=newArray(m.length);for(vari=0;i<m.length;i++){k[i]=m.charCodeAt(i)}h.push(k);break;cased:varn=this.get8bitByteArray(g);h.push(n);break;caseo:varm=this.getKanjiString(g);h.push(m);break}}while(true);returnh})}; |
解析實例：
qrcodeRD.html
|
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 |
<!DOCTYPEhtml> <html> <head> <body> <script>
newfile.onchange=function(){ </html> |
運行
注意：reqrcode.js格式是不是不好看，但是格式化后就不好使了 ~
總結
以上是生活随笔為你收集整理的二维码解析：使用 JavaScript 库reqrcode.js解析二维码的全部內容，希望文章能夠幫你解決所遇到的問題。
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