将base64上传到firebase存储并取回下载url

function base64ToBlob(base64Data, contentType) {
  const byteCharacters = atob(base64Data);
  const byteArrays = [];

  for (let offset = 0; offset < byteCharacters.length; offset += 512) {
    const slice = byteCharacters.slice(offset, offset + 512);

    const byteNumbers = new Array(slice.length);
    for (let i = 0; i < slice.length; i++) {
      byteNumbers[i] = slice.charCodeAt(i);
    }

    const byteArray = new Uint8Array(byteNumbers);
    byteArrays.push(byteArray);
  }

  return new Blob(byteArrays, { type: contentType });
}

const storageRef = firebase.storage().ref();
const fileRef = storageRef.child('filename.jpg'); // 替换为你想要的文件名和扩展名

const blob = base64ToBlob(base64Data, 'image/jpeg'); // 替换为你的base64数据和对应的contentType
fileRef.put(blob).then((snapshot) => {
  console.log('文件上传成功');
});

fileRef.getDownloadURL().then((url) => {
  console.log('文件下载URL:', url);
});