Question

@numba.njit
def med(data):
    res = np.full_like(data, np.nan)
    state = init(data[:windowsize])
    res[halfsize] = func(*state)
    for i in range(windowsize, data.size):
        xin,xout = data[i], data[i - windowsize]
        state = update(*state, xin, xout)
        res[i-halfsize] = func(*state)
    return res

这是我的上传图片的完整功能。我唯一的问题是该函数内部具有回调函数。

import pandas
data=pandas.DataFrame(np.random.rand(10**5))

%time res1=data[0].rolling(window = windowsize, center = True).apply(funcX, raw = True)
Wall time: 10.8 s

res2=med(data[0].values)

np.allclose((res1-res2)[halfsize:-halfsize],0)
Out[112]: True

%timeit res2=med(data[0].values)
40.4 ms ± 462 µs per loop (mean ± std. dev. of 7 runs, 10 loops each)

仅此部分可以获取异步等待功能？

Answer 1

如果有人在使用 await/async 而不是回调时需要同时观察上传进度，则此代码有效：

try {
   await saveToFirebase();
   alert("Happy days!");
} catch (error) {
   alert("Sad days!");
}


async function saveToFirebase() {
   // Create promise.
   let promise = $.Deferred();

   // Set storage reference.
   let storageRef = firebase.storage().ref();

   // Se file path.
   let filepath = "your-path.txt";

   // Set content type.
   let metadata = {
      contentType: "text/plain",
      cacheControl: "no-cache, max-age=0"
   };

   // Start upload.
   let uploadTask = storageRef.child(filepath).putString(data, "raw", metadata);

   // Monitor state of upload operation.
   uploadTask.on(firebase.storage.TaskEvent.STATE_CHANGED, function(snapshot) {
      // Get task progress, including number of bytes uploaded and total number of bytes to be uploaded.
      let progress = (snapshot.bytesTransferred / snapshot.totalBytes);
      
      // Display progress to user.

   // Error during upload?
   }, function(error) {
      promise.reject(error);

   // Nope, upload succeeded.
   }, function() {
      promise.resolve();
   });

   // Return promise.
   return promise;
}

Answer 2

您可以很好地在then()上致电UploadTask，如下所述：https://firebase.google.com/docs/reference/js/firebase.storage.UploadTask#then

此对象的行为类似于Promise，并通过其快照进行解析上传完成后保存数据。

因此您可以执行以下操作：

async UPLOAD_IMAGES() {
      try {
        let self = this;
        const storageRef = firebase.storage().ref();
        const files = document.getElementById("photoupload").files;
        const file = files[0];
        // Create the file metadata
        const metadata = {
          contentType: "image/jpeg"
        };

        const fileRef = storageRef
          .child(`${this.name}/` + file.name);

        const uploadTaskSnapshot = await fileRef.put(file, metadata);

        const downloadURL = await uploadTaskSnapshot.ref.getDownloadURL();

        self = downloadURL;

      } catch (error) {
        console.log("ERR ===", error);
        alert("Image uploading failed!");
      }
    }

Firebase图像以异步等待方式上传

2 个答案: