如何将错误对象传递给socket.io回调 [英] How to pass error object to socket.io callback

问题描述

我正在使用socket.io的回调

I am using callbacks with socket.io

客户代码：

socket.emit('someEvent', {data:1}, function(err, result) {
    console.log(err.message); 
});

服务器代码：

socket.on('someEvent', function(data, callback) {
    callback(new Error('testing error'));
});

使用上面的代码，客户端总是输出 undefined 。如果我将服务器端代码更改为以下内容，我可以看到错误消息。

With the above code the client side always prints out undefined. If I change the server side code to the following I can see the error message.

socket.on('someEvent', function(data, callback) {
    callback({message:'testing error'});
});

我可以将自己的自定义对象传递给客户端，只是不是错误对象。有什么想法？

I can pass my own custom objects to the client just fine, just not the error object. Any ideas?

推荐答案

socket.io 数据被序列化为 JSON ，它只能表示普通对象。您需要将任何错误序列化为可识别的普通对象格式，或者让Socket.IO的标准序列化执行其操作（这将导致错误实例的纯空对象。

socket.io data is serialized as JSON, which can only represent plain objects. You will need to serialize any errors into a recognizable plain-object format, or let Socket.IO's standard serialization do its thing (which will result in a plain empty object for Error instances.

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