如何从堆栈溢出获取新问题的通知? [英] How get notifications from stack overflow for new questions?

问题描述

我想回答新的 javascript、react、react-native 和 node 问题.那么，我如何知道用户在这些领域提出的新问题?

I would like to answer to new javascript, react, react-native and node questions. So, how would I know about the new questions which are asked by users on these areas?

推荐答案

打开一个到 wss://qa.sockets.stackexchange.com/ 的 Websocket 连接，然后发送消息 1-questions-newest-tag-TAG 其中 TAG 是您要关注的标签.这是一个实时片段:

Open a Websocket connection to wss://qa.sockets.stackexchange.com/, then send the message 1-questions-newest-tag-TAG where TAG is the tag you want to watch for. Here's a live snippet:

const socket = new WebSocket('wss://qa.sockets.stackexchange.com/');
socket.onopen = () => {
  socket.send('1-questions-newest-tag-javascript');
  socket.send('1-questions-newest-tag-java');
  socket.send('1-questions-newest-tag-python');
  socket.send('1-questions-newest-tag-php');
  console.log('Listening...');
};
const seenQuestions = new Set();
socket.onmessage = ({ data }) => {
  const obj = JSON.parse(data);
  if (obj.action === 'hb') {
    socket.send('pong');
    return;
  }
  const { id, body } = JSON.parse(obj.data);
  if (seenQuestions.has(id)) {
    // Duplicate question, a message for it has already been handled:
    return;
  }
  seenQuestions.add(id);
  console.log('New question:', id);
  document.body.insertAdjacentHTML('beforeend', body);
};
socket.onerror = console.error; // just in case

<!-- Makes the inserted questions look a bit prettier: -->
<link rel="stylesheet" type="text/css" href="https://cdn.sstatic.net/Sites/stackoverflow/primary.css?v=d385c34dc2d7">

您确实需要监听 hb 消息并回复它，以便 StackExchange 知道保持连接有效.

You do need to listen for a hb message and reply to it, so that StackExchange knows to keep the connection alive.

请注意，套接字将为给定问题的每个被监听的标签发送数据.例如，如果某物同时使用 Javascript 和 React 标记，并且您已发送请求以侦听这两个标记，您将收到一条消息两次，因此需要 Set 来避免列出重复.

Do note that the socket will send data for a given question for every tag being listened for. Eg, if something is tagged with both Javascript and React, and you've sent requests to listen for both tags, you'll receive a message for that twice, hence the need for the Set to avoid listing duplicates.

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