二维码 [记录]

插件  <script src="${ctxPath}/libs/jquery.qrcode.min.js"></script> 　　

<div id="qrcode">
    <img src="" id="qrcodeImg">
</div>

$(function () {
    var qrcode=jQuery('#qrcode').qrcode({
        render: "canvas",
        text: $('input#codeInfo').val()
    });

    var canvas=qrcode.find('canvas').get(0);
    qrcode.find('canvas').remove();
    $('#qrcodeImg').attr('src',canvas.toDataURL('image/jpg'));
})

参考代码

<script type="text/javascript">
    var qrcode=$("#code").qrcode({ 
        render:'canvas||table',
         200, //宽度 
        height:200, //高度 
        text: "http://www.baidu.com" //任意内容 
    }).hide(); 
    var canvas=qrcode.find('canvas').get(0);  
    //如果有循环,此句必不可少 qrcode.find('canvas').remove();
    var data = canvas.toDataURL('image/jpg');
    $('#img').attr('src',data) ;
    saveFile(data,"fd范德萨范德萨");

    //转为图片的方法,需要上门的data
    function saveFile(data,filename){
        var save_link=document.createElementNS('http://www.w3.org/1999/xhtml', 'a');
        save_link.href=data;
        save_link.download=filename;
        var event=document.createEvent('MouseEvents');
        event.initMouseEvent('click',true,false,window,0,0,0,0,0,false,false,false,false,0,null);
        save_link.dispatchEvent(event);
    };
</script>