二维码JS之jquery.qrcode.js

(function( $ ){
$.fn.qrcode = function(options) {
// if options is string,
if( typeof options === ‘string‘ ){
options= { text: options };
}

// 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‘);

// 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);
}
}
// return just built canvas
return $table;
}
?

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

二维码JS之jquery.qrcode.js

原文地址：https://www.cnblogs.com/lxxwyhhsh/p/9466879.html