downloadClick() {const zip = new JSZip();const promises = [];this.downloadimgs.forEach((item) => { //this.downloadimgs为保存的数据// 先找到canvas节点下的二维码图片const myCanvas = document.getElementById(item.id).getElementsByTagName('canvas');// 创建一个a节点const a = document.createElement('a');// 设置a的href属性将canvas变成png格式const imgURL = myCanvas[0].toDataURL('image/jpg');a.download = item.id + '.jpg';const blob = this.base64ToBlob(imgURL);const promise = zip.file(a.download, blob, { binary: true }); //文件名、文件流、是否为二进制promises.push(promise);});Promise.all(promises).then(() => {zip.generateAsync({ type: 'blob' }).then((content) => {// 生成二进制流FileSaver.saveAs(content, '二维码.zip'); // 利用file-saver保存文件});});},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});},
