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小程序18年不做_javaScript生成支撑中文带logo的二维码(jquery.qrcode.js)

时间:2021-01-12 15:39来源:小程序18年不做 作者:jianzhan 点击:
javaScript转化成适用汉语带logo的二维码(jquery.qrcode.js) ''''swill 本文关键详细介绍了javaScript转化成二维码,更新改造jquery.qrcode.js,使之适用汉语,能带logo的二维码,具备一定的参照使
javaScript生成支持中文带logo的二维码(jquery.qrcode.js)     ''''swill   这篇文章主要介绍了javaScript生成二维码,改造jquery.qrcode.js,使之支持中文,能带logo的二维码,具有一定的参考价值,感兴趣的小伙伴们可以参考一下

本文实例为大家分享了支持中文,且带logo的二维码的生成代码,供大家参考,具体内容如下

资料搜索

选择star最多的两个

第一个就是用的比较多的jquery.qrcode.js(但不支持中文,不能带logo)啦,第二个支持ie6+,支持中文,根据第二个源代码,使得,jquery.qrcode.js,支持中文。

支持中文

//qrcode.js
function QR8bitByte(data) {
 this.mode = QRMode.MODE_8BIT_BYTE;
 this.data = data;
QR8bitByte.prototype = {
 getLength : function(buffer) {
 return this.data.length;
 write : function(buffer) {
 for (var i = 0; i this.data.length; i++) {
 // not JIS ...
 buffer.put(this.data.charCodeAt(i), 8);

修改如下(就是复制粘贴了第二份代码的头部):

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 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) 
 byteArray[3] = 0x80 | (code 0x3F);
 } else if (code 0x800) {
 byteArray[0] = 0xE0 | ((code 0xF000) 12);
 byteArray[1] = 0x80 | ((code 0xFC0) 
 byteArray[2] = 0x80 | (code 0x3F);
 } else if (code 0x80) {
 byteArray[0] = 0xC0 | ((code 0x7C0) 
 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 i++) {
 buffer.put(this.parsedData[i], 8);

 网上也提供的解决方案:

//在传入文本处转码也可
function utf16to8(str) {
 var out, i, len, c;
 out = "";
 len = str.length;
 for(i = 0; i len; i++) {
 c = str.charCodeAt(i);
 if ((c = 0x0001) (c = 0x007F)) {
 out += str.charAt(i);
 } else if (c 0x07FF) {
 out += String.fromCharCode(0xE0 | ((c 12) 0x0F));
 out += String.fromCharCode(0x80 | ((c 6) 0x3F));
 out += String.fromCharCode(0x80 | ((c 0) 0x3F));
 } else {
 out += String.fromCharCode(0xC0 | ((c 6) 0x1F));
 out += String.fromCharCode(0x80 | ((c 0) 0x3F));
 return out;

支持自定义logo

修改jquery.qrcode.js,createCanvas函数

var createCanvas = function(){
 // create the qrcode itself
 var qrcode = new QRCode(options.typeNumber, options.correctLevel);
 qrcode.addData(options.text);
 qrcode.make();
 // create canvas element
 var canvas = document.createElement('canvas');
 canvas.width = options.width;
 canvas.height = options.height;
 var ctx = canvas.getContext('2d');
 //增加以下代码,把图片画出来
 if( options.src ) {//传进来的图片地址
 //图片大小
 options.imgWidth = options.imgWidth || options.width / 4.7;
 options.imgHeight = options.imgHeight || options.height / 4.7;
 var img = new Image();
 img.src = options.src;
 //不放在onload里,图片出不来
 img.onload = function () {
 ctx.drawImage(img, (options.width - options.imgWidth) / 2, (options.height - options.imgHeight) / 2, options.imgWidth, options.imgHeight);
 // compute tileW/tileH based on options.width/options.height
 var tileW = options.width / qrcode.getModuleCount();
 var tileH = options.height / qrcode.getModuleCount();
 // draw in the canvas
 for( var row = 0; row qrcode.getModuleCount(); row++ ){
 for( var col = 0; col qrcode.getModuleCount(); col++ ){
 ctx.fillStyle = qrcode.isDark(row, col) options.foreground : options.background;
 var w = (Math.ceil((col+1)*tileW) - Math.floor(col*tileW));
 var h = (Math.ceil((row+1)*tileW) - Math.floor(row*tileW));
 ctx.fillRect(Math.round(col*tileW),Math.round(row*tileH), w, h); 
 // return just built canvas
 return canvas;

修改jquery.qrcode.js,createTable函数(不支持canvas用table画二维码)

var createTable = function(){
 // create the qrcode itself
 var qrcode = new QRCode(options.typeNumber, options.correctLevel);
 qrcode.addData(options.text);
 qrcode.make();
 // create table element
 var $table = $(' table /table ')
 .css("width", options.width+"px")
 .css("height", options.height+"px")
 .css("border", "0px")
 .css("border-colla凡科抠图e", "colla凡科抠图e")
 .css('background-color', options.background);
 // compute tileS percentage
 var tileW = options.width / qrcode.getModuleCount();
 var tileH = options.height / qrcode.getModuleCount();
 // draw in the table
 for(var row = 0; row qrcode.getModuleCount(); row++ ){
 var $row = $(' tr /tr ').css('height', tileH+"px").appendTo($table);
 for(var col = 0; col qrcode.getModuleCount(); col++ ){
 $(' td /td ')
 .css('width', tileW+"px")
 .css('background-color', qrcode.isDark(row, col) options.foreground : options.background)
 .appendTo($row);
 //主要思想,把table,和img标签放在同一个div下,div relative定位,然后使得图片absolute定位在table中间
 if( options.src ) {
 options.imgWidth = options.imgWidth || options.width / 4.7;
 options.imgHeight = options.imgHeight || options.height / 4.7;
 var $img = $(' img ').attr("src", options.src)
 .css("width", options.imgWidth)
 .css("height", options.imgHeight)
 .css("position", "absolute")
 .css("left", (options.width - options.imgWidth) / 2)
 .css("top", (options.height - options.imgHeight) / 2);
 $table = $(' div /div ')
 .append($table)
 .append($img);
 // return just built canvas
 return $table;

对IE做特殊判断,大家懂的

//判断是否IE, IE8以下,用 table,否则用 canvas
 var isIE = function() {
 var b = document.createElement('b');
 b.innerHTML = ' !--[if IE] i /i ![endif]-- 
 return b.getElementsByTagName('i').length === 1;
 options.render = options.render ||
 (isIE(6) || isIE(7) || isIE(8)) "table": "canvas";

改过后的jquery.qrcode.js如下:

(function( $ ){
 $.fn.qrcode = function(options) {
 // if options is string, 
 if( typeof options === 'string' ){
 options = { text: options };
 //判断是否IE, IE8以下,用 table,否则用 canvas
 var isIE = function() {
 var b = document.createElement('b');
 b.innerHTML = ' !--[if IE] i /i ![endif]-- 
 return b.getElementsByTagName('i').length === 1;
 options.render = options.render ||
 (isIE(6) || isIE(7) || isIE(8)) "table": "canvas";
 // set default values
 // typeNumber 1 for automatic calculation
 options = $.extend( {}, {
 // render : "canvas",
 width : 256,
 height : 256,
 typeNumber : -1,
 correctLevel : QRErrorCorrectLevel.H,
 background : "#ffffff",
 foreground : "#000000"
 }, options);
 var createCanvas = function(){
 // create the qrcode itself
 var qrcode = new QRCode(options.typeNumber, options.correctLevel);
 qrcode.addData(options.text);
 qrcode.make();
 // create canvas element
 var canvas = document.createElement('canvas');
 canvas.width = options.width;
 canvas.height = options.height;
 var ctx = canvas.getContext('2d');
 //在中间画logo
 if( options.src ) {
 options.imgWidth = options.imgWidth || options.width / 4.7;
 options.imgHeight = options.imgHeight || options.height / 4.7;
 var img = new Image();
 img.src = options.src;
 img.onload = function () {
 ctx.drawImage(img, (options.width - options.imgWidth) / 2, (options.height - options.imgHeight) / 2, options.imgWidth, options.imgHeight);
 // compute tileW/tileH based on options.width/options.height
 var tileW = options.width / qrcode.getModuleCount();
 var tileH = options.height / qrcode.getModuleCount();
 // draw in the canvas
 for( var row = 0; row qrcode.getModuleCount(); row++ ){
 for( var col = 0; col qrcode.getModuleCount(); col++ ){
 ctx.fillStyle = qrcode.isDark(row, col) options.foreground : options.background;
 var w = (Math.ceil((col+1)*tileW) - Math.floor(col*tileW));
 var h = (Math.ceil((row+1)*tileW) - Math.floor(row*tileW));
 ctx.fillRect(Math.round(col*tileW),Math.round(row*tileH), w, h); 
 // return just built canvas
 return canvas;
 // from Jon-Carlos Rivera (imbcmdth)
 var createTable = function(){
 // create the qrcode itself
 var qrcode = new QRCode(options.typeNumber, options.correctLevel);
 qrcode.addData(options.text);
 qrcode.make();
 // create table element
 var $table = $(' table /table ')
 .css("width", options.width+"px")
 .css("height", options.height+"px")
 .css("border", "0px")
 .css("border-colla凡科抠图e", "colla凡科抠图e")
 .css('background-color', options.background);
 // compute tileS percentage
 var tileW = options.width / qrcode.getModuleCount();
 var tileH = options.height / qrcode.getModuleCount();
 // draw in the table
 for(var row = 0; row qrcode.getModuleCount(); row++ ){
 var $row = $(' tr /tr ').css('height', tileH+"px").appendTo($table);
 for(var col = 0; col qrcode.getModuleCount(); col++ ){
 $(' td /td ')
 .css('width', tileW+"px")
 .css('background-color', qrcode.isDark(row, col) options.foreground : options.background)
 .appendTo($row);
 //生成logo
 if( options.src ) {
 options.imgWidth = options.imgWidth || options.width / 4.7;
 options.imgHeight = options.imgHeight || options.height / 4.7;
 var $img = $(' img ').attr("src", options.src)
 .css("width", options.imgWidth)
 .css("height", options.imgHeight)
 .css("position", "absolute")
 .css("left", (options.width - options.imgWidth) / 2)
 .css("top", (options.height - options.imgHeight) / 2);
 $table = $(' div /div ')
 .append($table)
 .append($img);
 // return just built canvas
 return $table;

return this.each(function(){ var element = options.render == "canvas" createCanvas() : createTable(); $(element).appendTo(this); })( jQuery );

测试

jQuery('#qrcodeTable').qrcode({
 render : "table",
 text : "中文://",
 src: './logo32.png'
jQuery('#qrcodeCanvas').qrcode({
 text : "中午你://",
 src: './logo32.png'

以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持凡科。

(责任编辑:admin)

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