JS method to generate QR code from link and convert it into picture

This article mainly introduces you to the JS method of generating QR codes from links and converting them into pictures, involving the qrcodejs plug-in and js picture generation related operating techniques. Friends who need it can refer to it. I hope it can help you.

<p id="code"></p>
<img id="img"/>
<script type="text/javascript">
  var qrcode=$("#code").qrcode({
    render:&#39;canvas||table&#39;,
    width: 200, //宽度
    height:200, //高度
    text: "http://www.baidu.com" //任意内容
  }).hide();
  var canvas=qrcode.find(&#39;canvas&#39;).get(0);
  //如果有循环,此句必不可少 qrcode.find(&#39;canvas&#39;).remove();
  var data = canvas.toDataURL(&#39;image/jpg&#39;);
  $(&#39;#img&#39;).attr(&#39;src&#39;,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(&#39;http://www.w3.org/1999/xhtml&#39;, &#39;a&#39;);
    save_link.href=data;
    save_link.download=filename;
    var event=document.createEvent(&#39;MouseEvents&#39;);
    event.initMouseEvent(&#39;click&#39;,true,false,window,0,0,0,0,0,false,false,false,false,0,null);
    save_link.dispatchEvent(event);
  };
</script>

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