有没有办法将 javascript object 转换为字符串？

Question

I am building a simple chat app and want to greet new users with a welcome mesage, but all i see is [object Object].我正在构建一个简单的聊天应用程序，并想用欢迎消息向新用户致意，但我看到的只是 [object Object]。 The connection is working.连接正常。 What to do?该怎么办？

This is the messages object that i am using to model the messages这是我正在使用的消息 object 到 model 消息

const generateMessage = (text) => {
    return {
        text,
        createdAt: new Date().getTime()
    }
}

module.exports = {
    generateMessage
}

Here is my connection这是我的连接

io.on("connection", (socket) => {
    console.log("New socket connection")

    socket.emit("message", generateMessage("Welcome to the chat"))
    socket.broadcast.emit("message", "A new user has joined",)

    socket.on("sendMessage", (message, callback) => {
        io.emit("message", message)
        callback()
    })
    socket.on("disconnect", () => {
        io.emit("message", "A user has left")
    })
})

And here is the html where i render the messages to the browser这是 html，我将消息呈现给浏览器

<body>
    Chat app

    <div id="messages"></div>

    <form id="message-form">
        <input name="message" placeholder="Message">
        <button>Send</button>
    </form>
    

    <template id="message-template">
            <p></p>
    </template>

    <script src="/socket.io/socket.io.js"></script>
    <script src="../chat/chat2.js"></script>
</body>

Answer 1

In your client (the html file) you should create the message accessing text property of object:在您的客户端（html 文件）中，您应该创建 object 的消息访问文本属性：

const htmlMessageText = messageObjReceivedFromSocket.text

Not pass the object itself.不传递 object 本身。

It'll easier help you if post how you handling the socket events on client.如果发布您如何在客户端处理套接字事件，它会更容易帮助您。

Answer 2

okay first thing that generateMessage function is not returning proper key value好的，generateMessage function 没有返回正确的键值的第一件事

 return {
        text: text,
        createdAt: new Date().getTime()
 }

and the second thing you are trying to render the whole object but you should render第二件事你试图渲染整个 object 但你应该渲染

socket.emit("message", generateMessage("Welcome to the chat").text)

有没有办法将 javascript object 转换为字符串？

问题描述

2 个解决方案

解决方案1
0 2021-08-13 14:44:36

解决方案2
0 已采纳 2021-08-13 14:50:43

有没有办法将 javascript object 转换为字符串？

问题描述

2 个解决方案

解决方案1 0 2021-08-13 14:44:36

解决方案2 0 已采纳 2021-08-13 14:50:43

解决方案1
0 2021-08-13 14:44:36

解决方案2
0 已采纳 2021-08-13 14:50:43