js jquery.qrcode生成二维码带logo 支持中文

傷城~ 2022-04-11 04:18 375阅读 0赞

前天用js生成二维码，节省服务器资源及带宽

原版jquery.qrcode不能生成logo，本文采用的是修改版

**一、显示效果**  
**![format_png][]**

**二、页面**

<!DOCTYPE HTML>
    <html>
    <head>
    <title>生成带有logo的二维码</title>
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
    
    <script src="js/jquery-1.8.2.js" type="text/javascript"></script>
    <script src="js/excanvas.js"></script>
    <script src="js/qrcode.js"></script>
    <script type="text/javascript">
    $(function() {
        $("#bt").bind("click",
            function() {
            		$("#qrcode_div").empty();
                var text = $("#text").val();
                $('#qrcode_div').qrcode({
                    render: 'canvas',
                    text: utf16to8(text),
                    height: 200,
                    width: 200,
                    typeNumber: -1,			//计算模式
                    correctLevel: QRErrorCorrectLevel.M,//纠错等级
                    background: "#ffffff",	//背景颜色
                    foreground: "#000000",	//前景颜色
                    //logo图片地址
                    src: 'logo.png'
                });
                //console.info("wwww");
            }
        );
    });
    
    function utf16to8(str) { //转码
        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;
    }
    </script>
    
    </head>
    <body>
    <input type="text" id="text" value="甜甜，我爱你！" style="width:200px;"/>
    <input type="button" value="生成二维码" id="bt" />
    <div id="qrcode_div" style="margin-top:10px;">
    
    </div>
    
    </body>
    </html>

**纠错等级：**

QRErrorCorrectLevel.L 7%的字码可被修正

QRErrorCorrectLevel.M 15%的字码可被修正

QRErrorCorrectLevel.Q 25%的字码可被修正

QRErrorCorrectLevel.H 30%的字码可被修正

jquery-1.8.2.js可采用压缩文件jquery-1.8.2.min.js（自行下载）

excanvas.js可采用压缩文件excanvas.compiled.js（自行下载）

项目资源下载地址

[http://download.csdn.net/detail/haveqing/9505689][http_download.csdn.net_detail_haveqing_9505689]

java生成二维码QRCode Zxing SwetakeQRCode barcode4j

http://happyqing.iteye.com/blog/2292524

参考：

使用jquery-qrcode生成二维码  
[http://www.cnblogs.com/xcsn/archive/2013/08/14/3258035.html][http_www.cnblogs.com_xcsn_archive_2013_08_14_3258035.html]  
JS生成带logo的二维码  
[http://my.oschina.net/xuwang1993/blog/647291][http_my.oschina.net_xuwang1993_blog_647291]  
Qrcode生成二维码（logo篇）之jquery.qrcode.min.js  
[http://blog.csdn.net/gao36951/article/details/48975353][http_blog.csdn.net_gao36951_article_details_48975353]

[format_png]: /images/20220411/79c0ddcae3e241c788aff24895501374.png
[http_download.csdn.net_detail_haveqing_9505689]: http://download.csdn.net/detail/haveqing/9505689
[http_www.cnblogs.com_xcsn_archive_2013_08_14_3258035.html]: http://www.cnblogs.com/xcsn/archive/2013/08/14/3258035.html
[http_my.oschina.net_xuwang1993_blog_647291]: http://my.oschina.net/xuwang1993/blog/647291
[http_blog.csdn.net_gao36951_article_details_48975353]: http://blog.csdn.net/gao36951/article/details/48975353