JQ插件：qrcode生成二维码

jquery.qrcode.js 是把它用jquery方式封装起来的，用它来实现图形渲染，其实就是画图（支持canvas和table两种方式）



导入包：

<script type="text/javascript" src="js/jquery.qrcode.js"></script>

在html中加入一个div用于显示二维码

<div id="qrcode"></div>

JS代码：

var options = {render: 'div',//设置渲染方式canvas/tableecLevel: 'L',background: '#FFF',text: QR,//设置二维码内容size: parseInt($("#qrcode").width(), 10)*0.7,mSize: 0.1,mPosX: 0.5,mPosY: 0.5,label: 'no label',fontname: 'sans',fontcolor: '#FFF'};$("#qrcode").empty().qrcode(options);

渲染方式写成div似乎也可以。

在设置二维码内容时，如果是中文，需要使用utf16to8(str)转换一下：

/* utf.js - UTF-8 <=> UTF-16 convertion * * Copyright (C) 1999 Masanao Izumo <[e-mail]> * Version: 1.0 * LastModified: Dec 25 1999 * This library is free.  You can redistribute it and/or modify it. *//* * Interfaces: * utf8 = utf16to8(utf16); * utf16 = utf16to8(utf8); */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;}function utf8to16(str) {    var out, i, len, c;    var char2, char3;    out = "";    len = str.length;    i = 0;    while(i < len) {c = str.charCodeAt(i++);switch(c >> 4){   case 0: case 1: case 2: case 3: case 4: case 5: case 6: case 7:    // 0xxxxxxx    out += str.charAt(i-1);    break;  case 12: case 13:    // 110x xxxx   10xx xxxx    char2 = str.charCodeAt(i++);    out += String.fromCharCode(((c & 0x1F) << 6) | (char2 & 0x3F));    break;  case 14:    // 1110 xxxx  10xx xxxx  10xx xxxx    char2 = str.charCodeAt(i++);    char3 = str.charCodeAt(i++);    out += String.fromCharCode(((c & 0x0F) << 12) |   ((char2 & 0x3F) << 6) |   ((char3 & 0x3F) << 0));    break;}    }    return out;}

参考：
https://github.com/jeromeetienne/jquery-qrcode