<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.οnlοad=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>