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
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//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);
}
}
};
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修改如下（就是复制粘贴了第二份代码的头部）：
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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);
}
}
};
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网上也提供的解决方案：
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//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;
}
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支持自定义logo
修改jquery.qrcode.js，createCanvas函数
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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;
};
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修改jquery.qrcode.js，createTable函数（不支持canvas用table画二维码）
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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;
};
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对IE做特殊判断，大家懂的
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//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"
;
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改过后的jquery.qrcode.js如下：
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(
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 );
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测试
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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'
});
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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脚本之家。