用前端将链接转为二维码，并下载

<script src="js/jquery.js"></script>
<script src="js/jquery.min.js"></script>
<script src="js/qrcode.js"></script>

 

<script type="text/javascript">
// alert("111");

var qrcode=new QRCode(document.getElementById('qrcode'), "https://z.jd.com/bigger/search.html");
var imgs = document.getElementById("qrcode").getElementsByTagName("img")[0]
console.log(imgs)
window.onload=function(e){
console.log(imgs.src)
var picName=imgs.src;
download(picName);
}
//下载图片
function download(picName) {
let imgData = picName;//这里放需要下载的base64
this.downloadFile('测试.png', imgData);
}
//下载
function downloadFile(fileName, content) {
let aLink = document.createElement('a');
let blob = this.base64ToBlob(content); //new Blob([content]);

let evt = document.createEvent("HTMLEvents");
evt.initEvent("click", true, true);//initEvent 不加后两个参数在FF下会报错 事件类型，是否冒泡，是否阻止浏览器的默认行为
aLink.download = fileName;
aLink.href = URL.createObjectURL(blob);

// aLink.dispatchEvent(evt);
aLink.click()
}
//base64转blob
function base64ToBlob(code) {
let parts = code.split(';base64,');
let contentType = parts[0].split(':')[1];
let raw = window.atob(parts[1]);
let rawLength = raw.length;

let uInt8Array = new Uint8Array(rawLength);

for (let i = 0; i < rawLength; ++i) {
uInt8Array[i] = raw.charCodeAt(i);
}
return new Blob([uInt8Array], {type: contentType});
}
</script>