前端和后端源码，合并到一个git仓库中，方便用户下载，避免前后端不匹配的问题

jeecgboot-vue3/src/utils/file/base64Conver.ts

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+/**
+ * @description: base64 to blob
+ */
+export function dataURLtoBlob(base64Buf: string): Blob {
+  const arr = base64Buf.split(',');
+  const typeItem = arr[0];
+  const mime = typeItem.match(/:(.*?);/)![1];
+  const bstr = atob(arr[1]);
+  let n = bstr.length;
+  const u8arr = new Uint8Array(n);
+  while (n--) {
+    u8arr[n] = bstr.charCodeAt(n);
+  }
+  return new Blob([u8arr], { type: mime });
+}
+
+/**
+ * img url to base64
+ * @param url
+ */
+export function urlToBase64(url: string, mineType?: string): Promise<string> {
+  return new Promise((resolve, reject) => {
+    let canvas = document.createElement('CANVAS') as Nullable<HTMLCanvasElement>;
+    const ctx = canvas!.getContext('2d');
+
+    const img = new Image();
+    img.crossOrigin = '';
+    img.onload = function () {
+      if (!canvas || !ctx) {
+        return reject();
+      }
+      canvas.height = img.height;
+      canvas.width = img.width;
+      ctx.drawImage(img, 0, 0);
+      const dataURL = canvas.toDataURL(mineType || 'image/png');
+      canvas = null;
+      resolve(dataURL);
+    };
+    img.src = url;
+  });
+}

jeecgboot-vue3/src/utils/file/download.ts

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+import { openWindow } from '..';
+import { dataURLtoBlob, urlToBase64 } from './base64Conver';
+
+/**
+ * Download online pictures
+ * @param url
+ * @param filename
+ * @param mime
+ * @param bom
+ */
+export function downloadByOnlineUrl(url: string, filename: string, mime?: string, bom?: BlobPart) {
+  urlToBase64(url).then((base64) => {
+    downloadByBase64(base64, filename, mime, bom);
+  });
+}
+
+/**
+ * Download pictures based on base64
+ * @param buf
+ * @param filename
+ * @param mime
+ * @param bom
+ */
+export function downloadByBase64(buf: string, filename: string, mime?: string, bom?: BlobPart) {
+  const base64Buf = dataURLtoBlob(buf);
+  downloadByData(base64Buf, filename, mime, bom);
+}
+
+/**
+ * Download according to the background interface file stream
+ * @param {*} data
+ * @param {*} filename
+ * @param {*} mime
+ * @param {*} bom
+ */
+export function downloadByData(data: BlobPart, filename: string, mime?: string, bom?: BlobPart) {
+  const blobData = typeof bom !== 'undefined' ? [bom, data] : [data];
+  const blob = new Blob(blobData, { type: mime || 'application/octet-stream' });
+  if (typeof window.navigator.msSaveBlob !== 'undefined') {
+    window.navigator.msSaveBlob(blob, filename);
+  } else {
+    const blobURL = window.URL.createObjectURL(blob);
+    const tempLink = document.createElement('a');
+    tempLink.style.display = 'none';
+    tempLink.href = blobURL;
+    tempLink.setAttribute('download', filename);
+    if (typeof tempLink.download === 'undefined') {
+      tempLink.setAttribute('target', '_blank');
+    }
+    document.body.appendChild(tempLink);
+    tempLink.click();
+    document.body.removeChild(tempLink);
+    window.URL.revokeObjectURL(blobURL);
+  }
+}
+
+/**
+ * Download file according to file address
+ * @param {*} sUrl
+ */
+export function downloadByUrl({ url, target = '_blank', fileName }: { url: string; target?: TargetContext; fileName?: string }): boolean {
+  const isChrome = window.navigator.userAgent.toLowerCase().indexOf('chrome') > -1;
+  const isSafari = window.navigator.userAgent.toLowerCase().indexOf('safari') > -1;
+
+  if (/(iP)/g.test(window.navigator.userAgent)) {
+    console.error('Your browser does not support download!');
+    return false;
+  }
+  if (isChrome || isSafari) {
+    const link = document.createElement('a');
+    link.href = url;
+    link.target = target;
+
+    if (link.download !== undefined) {
+      link.download = fileName || url.substring(url.lastIndexOf('/') + 1, url.length);
+    }
+
+    if (document.createEvent) {
+      const e = document.createEvent('MouseEvents');
+      e.initEvent('click', true, true);
+      link.dispatchEvent(e);
+      return true;
+    }
+  }
+  if (url.indexOf('?') === -1) {
+    url += '?download';
+  }
+
+  openWindow(url, { target });
+  return true;
+}