javaScript生成支持中文带logo的二维码(jquery.qrcode
编程学习 2021-07-04 19:20www.dzhlxh.cn编程入门
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 < 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);
}
}
};
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-collapse", "collapse")
.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 = $('<div style="position:relative;"></div>')
.append($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 (https://github.com/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-collapse", "collapse")
.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 = $('<div style="position:relative;"></div>')
.append($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://jetienne.com",
src: './logo32.png'
});
jQuery('#qrcodeCanvas').qrcode({
text : "中午你://jetienne.com",
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狼蚁SEO。