当我使用浏览器测试几乎相同的代码时,当我刷新页面时,套接字会自动关闭并在页面加载时创建新的Websocket.

如果生产环境中仍存在此问题,则可能非常关键.

这是服务器端代码(我使用了express-ws)：

const sockets = {};
 
app.ws('/',(socket,req) => {
    // Generate unique id to socket and save to socket list
    const uid = uuid.v4();
    socket.uid = uid;
 
    console.log(`Socket ${uid} connected.`);
    sockets[uid] = socket;
 
    socket.on('message',(data) => {
        broadcast(data);
    });
    socket.on('close',() => {
        console.log(`Socket ${uid} disconnected.`);
        delete sockets[uid];
 
        broadcast({
            type: 'plain',message: `User ${socket.username} leaved the channel.`
        });
        socket = null;  // make sure to remove socket
    });
});

服务器只保存已连接的WebSocket,并在关闭时将其删除.你可以看到我记录了我在连接时创建的Socket id,用于识别每个websocket方便,它看起来像这样(使用node-uuid)：

Socket d0b62d3a-2ed9-4258-9d2d-e83a3eb99e6c disconnected.

好吧,当我使用Web浏览器测试此服务器时,它运行良好.每次刷新成功都是关闭套接字并创建新套接字.

但是使用React Native,socket在刷新应用程序时永远不会关闭.经过几次刷新,最后退出应用程序后,这些消息突然出现在控制台上：

Socket d0b62d3a-2ed9-4258-9d2d-e83a3eb99e6c disconnected.
Socket 2e1a2bba-ac64-4368-aeca-a02721f28ce5 disconnected.
Socket 6673c9a3-9667-425a-8923-efbc40196226 disconnected.
Socket 08fee145-e9bf-4af0-a245-dda2fe6a8e56 disconnected.
Socket 55ce1926-d7fa-488b-92d9-ff3dea874496 disconnected.
Socket 9c4c166d-d6d6-4a11-b400-a3eac51ab91f disconnected.
Socket 9f6db512-649c-440e-8b88-9a77d20e1943 disconnected.
Socket a9e6c0bd-419c-40af-865a-2573eca26a0f disconnected.
Socket 70835c7a-3230-4e20-b133-b6c2942dff22 disconnected.
Socket 5c83d81c-c0f1-4b9a-b5fb-7f09430a2f09 disconnected.
Socket 4f11aea4-d0ad-4e2b-9613-9e994657ecaf disconnected.

下面的代码是我的React Native应用程序的WebSocket处理部分.

import store from './store';
import * as ChatActions from './actions/Chat';
import * as NetworkActions from './actions/Network';
 
const socket = null;
 
export function init() {
    socket = new WebSocket('ws://mywebsite.com:3300');
 
    socket.onopen = () => {
        store.dispatch({
            type: NetworkActions.NETWORK_SOCK_CONNECTED,data: {}
        });
    };
 
    socket.onmessage = (e) => {
        var data = e.data;
        try {
            data = JSON.parse(e.data);
        }
        catch(err) {}
 
        store.dispatch({
            type: ChatActions.CHAT_RECV,data: data.message
        });
    };
 
    socket.onclose = (e) => {
        store.dispatch({
            type: NetworkActions.NETWORK_SOCK_CLOSED,data: {}
        });
    };
}
 
export function send(data) {
    data = typeof data === 'object' ? JSON.stringify(data) : data;
    socket.send(data);
}

如果我应该在应用程序结束之前关闭套接字,并且任何人都知道这一点,请给我一些建议.我对React Native不是很了解,也没有在google上找到相关的帖子,所以非常感谢它给我一些建议.谢谢！

附：哦,我用Android进行测试.