下面 python 代码用 js 重写应该没问题吧，图床支持 access-control-allow-origin: * 这样是不是直接就能在游览器里实现个下载器。

def decode_png(self, data):     img = Image.open(BytesIO(data))     data = img.tobytes()      sz = struct.unpack('<I', data[:4])[0]     data = data[4:4+sz]     return data  def download(i, block_dict, f, offset):     global succ      url = block_dict['url']     for j in range(10):         if not succ: break         block = api.image_download(url)         if not block:             log(f"分块{i + 1}/{nblocks}第{j + 1}次下载失败")             if j == 9: succ = False             continue         block = encoder.decode(block)         if calc_sha1(block) == block_dict['sha1']:             with lock:                 f.seek(offset)                 f.write(block)             log(f"分块{i + 1}/{nblocks}下载完毕")             break         else:             log(f"分块{i + 1}/{nblocks}校验未通过")             if j == 9: succ = False 

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