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javascript - 无法使用 Vue 插件连接到 WebSocket

转载 作者:行者123 更新时间:2023-11-30 06:12:04 54 4
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我想编写一个 vue 插件,以便在我的 Vue 应用程序中获取方便的 WebSocket 方法,例如 connect()subscribe()。我在连接到 WebSocket 时遇到问题,它仅在我调用已安​​装 Hook 中的 connect() 方法并加载整个页面时有效(就像使用浏览器刷新按钮一样)。在另一种情况下,当我首先加载页面然后通过单击按钮显式调用 connect() 方法时,未建立连接。

我的 vue-plugin 代码:

import SockJS from "sockjs-client";
import Stomp from "webstomp-client";

const WebSocketTester = {
install(Vue, options) {
console.log("websocket tester launched");
let connected = false;
const ws = {
connected: () => connected
};

const stompClient = getStompClient("http://localhost:8080/ws");

const connect = () => {
return new Promise((resolve, reject) => {
if (connected) {
reject("Already connected !");
return;
}
console.log("trying to connect websocket");
stompClient.connect({}, frame => {
console.log("got websocket frame:");
console.log(frame);
if (frame.command == "CONNECTED") {
connected = true;
resolve();
} else {
reject("Could not connect with " + url);
}
});
});
};

ws.connect = () => {
return connect();
};

Vue.prototype.$ws = ws;
}
};

const getStompClient = webSocketUrl => {
const socket = new SockJS(webSocketUrl);
return Stomp.over(socket);
};

export default WebSocketTester;

我的 vue 组件:

<template>
<div class="hello">
<button @click="connect">Connect with websocket</button>
</div>
</template>

<script>
export default {
name: "HelloWorld",
props: {
msg: String
},
methods: {
connect() {
console.log("connecting...");
this.$ws.connect().catch(error => {
console.log("could not connect by click");
console.log(error);
});
}
},
mounted() {
// this works well
// this.$ws.connect().catch(error => {
// console.log("could not connect in mounted");
// console.log(error);
// });
}
};
</script>

在这种情况下,我取消注释挂载的钩子(Hook),在页面加载后我看到这样的控制台日志:

websocket tester launched
trying to connect websocket
Opening Web Socket...
Web Socket Opened...
DEPRECATED: undefined is not a recognized STOMP version. In next major client version, this will close the connection.
>>> CONNECT
>>> length 52
<<< CONNECTED
connected to server undefined
got websocket frame:
Frame {command: "CONNECTED", headers: {…}, body: ""}

一切正常。但是,如果我评论挂载的钩子(Hook)并想通过单击按钮连接到 WebSocket,则控制台日志如下所示:

websocket tester launched
connecting...
trying to connect websocket
Opening Web Socket...

就是这样,连接还没有建立。为什么会发生这种情况以及如何解决?

最佳答案

好吧,我明白了。问题行是插件中的 const stompClient = getStompClient("http://localhost:8080/ws");。我已将它移至连接方法并存储为 ws.object

        if (connected) {
reject("Already connected !");
return;
}
ws.stompClient = getStompClient("http://localhost:8080/ws");
console.log("trying to connect websocket");
ws.stompClient.connect({}, frame => {

后来,我使用了 ws.stompClient,它工作正常。

关于javascript - 无法使用 Vue 插件连接到 WebSocket,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/58302172/

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