Sử dụng siêu dữ liệu tệp bằng Cloud Storage trên web

import { getStorage, ref, getMetadata } from "firebase/storage";

// Create a reference to the file whose metadata we want to retrieve
const storage = getStorage();
const forestRef = ref(storage, 'images/forest.jpg');

// Get metadata properties
getMetadata(forestRef)
  .then((metadata) => {
    // Metadata now contains the metadata for 'images/forest.jpg'
  })
  .catch((error) => {
    // Uh-oh, an error occurred!
  });
storage_get_metadata.js

// Create a reference to the file whose metadata we want to retrieve
var forestRef = storageRef.child('images/forest.jpg');

// Get metadata properties
forestRef.getMetadata()
  .then((metadata) => {
    // Metadata now contains the metadata for 'images/forest.jpg'
  })
  .catch((error) => {
    // Uh-oh, an error occurred!
  });
file-metadata.js

import { getStorage, ref, updateMetadata } from "firebase/storage";

// Create a reference to the file whose metadata we want to change
const storage = getStorage();
const forestRef = ref(storage, 'images/forest.jpg');

// Create file metadata to update
const newMetadata = {
  cacheControl: 'public,max-age=300',
  contentType: 'image/jpeg'
};

// Update metadata properties
updateMetadata(forestRef, newMetadata)
  .then((metadata) => {
    // Updated metadata for 'images/forest.jpg' is returned in the Promise
  }).catch((error) => {
    // Uh-oh, an error occurred!
  });
storage_update_metadata.js

// Create a reference to the file whose metadata we want to change
var forestRef = storageRef.child('images/forest.jpg');

// Create file metadata to update
var newMetadata = {
  cacheControl: 'public,max-age=300',
  contentType: 'image/jpeg'
};

// Update metadata properties
forestRef.updateMetadata(newMetadata)
  .then((metadata) => {
    // Updated metadata for 'images/forest.jpg' is returned in the Promise
  }).catch((error) => {
    // Uh-oh, an error occurred!
  });
file-metadata.js

import { getStorage, ref, updateMetadata } from "firebase/storage";

const storage = getStorage();
const forestRef = ref(storage, 'images/forest.jpg');

// Create file metadata with property to delete
const deleteMetadata = {
  contentType: null
};

// Delete the metadata property
updateMetadata(forestRef, deleteMetadata)
  .then((metadata) => {
    // metadata.contentType should be null
  }).catch((error) => {
    // Uh-oh, an error occurred!
  });
storage_delete_metadata.js

// Create file metadata with property to delete
var deleteMetadata = {
  contentType: null
};

// Delete the metadata property
forestRef.updateMetadata(deleteMetadata)
  .then((metadata) => {
    // metadata.contentType should be null
  }).catch((error) => {
    // Uh-oh, an error occurred!
  });
file-metadata.js

const metadata = {
  customMetadata: {
    'location': 'Yosemite, CA, USA',
    'activity': 'Hiking'
  }
};
storage_custom_metadata.js

var metadata = {
  customMetadata: {
    'location': 'Yosemite, CA, USA',
    'activity': 'Hiking'
  }
};
file-metadata.js