Convert base64 to blob, and then convert it to file. Specific steps, comments, and use cases.

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1. Convert base64 string to blob object:

function convertBase64ToBlob(base64Str) {
    
    

  // 将base64字符串转为二进制数据
  const byteCharacters = atob(base64Str);

  // 创建Blob对象
  const blob = new Blob([byteCharacters], {
    
     type: 'application/octet-stream' });

  return blob;
}

2. Convert blob object to file object:

function convertBlobToFile(blob, fileName) {
    
    
  // 创建File对象
  const file = new File([blob], fileName, {
    
     type: blob.type });

  return file;
}

Note:

• convertBase64ToBlobThe method converts the base64 string into a blob object, uses the atob method to convert the base64 string into binary data, and then uses the Blob constructor to create a Blob object and specify the file type application/octet-stream.
• convertBlobToFileThe method converts the blob object into a file object and uses the File constructor to create the File object.

3. Use cases:

The sample code demonstrates an example of converting a base64 image string into a file object:

const base64Str = 'data:image/png;base64,iVBORw0KG...'; // 用实际的base64字符串替换
const fileName = 'image.png';

const blob = convertBase64ToBlob(base64Str);
const file = convertBlobToFile(blob, fileName);

console.log(file);

Output result:

File(85) {
    
    name: "image.png", lastModified: 1632490063760, lastModifiedDate: Tue Sep 24 2021 16:07:43 GMT+0800 (中国标准时间), webkitRelativePath: "", size: 85, …}