javascript socket.io - JSON 是发送对象的必要条件
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socket.io - is JSON a must to send an object
提问by poppel
I have a object in the frontend and I want to broadcast it to all connected clients. Can I send it as a mere object, the way I defined it? Or do I always have to stringyfy it as JSON object before sending?
我在前端有一个对象，我想将它广播给所有连接的客户端。我可以按照我定义的方式将它作为单纯的对象发送吗？或者我是否总是必须在发送之前将其字符串化为 JSON 对象？
my object:
我的对象：
var myBox = {
x: 400,
y: 700,
w: 231,
h: 199,
c: "red",
....
}
do I need stringify?
我需要字符串化吗？
var myBox = JSON.stringify({
x: 400,
y: 700,
...
});
At the moment I send it like this and the msg is a JSON:
目前我像这样发送它并且 msg 是一个 JSON：
socket.emit('message', msg);
回答by Asad Saeeduddin
You can pass the object to emitwithout stringifying it yourself. It will be sent as plaintext, but the client callback will be passed a parsed object.
您可以将对象传递给 ，emit而无需自己对其进行字符串化。它将作为纯文本发送，但客户端回调将传递一个解析对象。
In other words, doing this is fine:
换句话说，这样做很好：
var myBox = {?????
x: 400,
y: 700,
w: 231,
h: 199,
c: "red"
}
socket.emit('message', myBox);
When listening on the client, you don't need to worry about JSON.parse:
在听客户端时，您无需担心JSON.parse：
socket.on('message', function (data) {
alert(data.x);
});
回答by Bergi
Yes, to send an object you will need to serialize it to a string (or ArrayBuffer, to be exact) - some sequence of bits to go over the wire (under the hood of HTTP/WS).
是的，要发送一个对象，您需要将它序列化为一个字符串（或 ArrayBuffer，确切地说）——一些位序列通过网络（在 HTTP/WS 的引擎盖下）。
Yet, that serialisation does not necessarily need to be JSON.stringify, it could be anything else as well.
然而，该序列化不一定需要是JSON.stringify，它也可以是其他任何东西。
From what I read in their docs, Socket.io has "automatic JSON encoding/decoding" so it will do call the JSON.stringifyfor you, accepting plain objects as arguments to .emitas well.
根据我在他们的文档中读到的内容，Socket.io 具有“自动 JSON 编码/解码”，因此它会JSON.stringify为您调用，并接受普通对象作为参数.emit。
回答by Shazboticus S Shazbot
You can do a socket.emit with data from the object.
您可以使用来自对象的数据执行 socket.emit。
Like this:
像这样：
socket.emit("message",{x:myBox.x,y:myBox.y, w:myBox.w, h:myBox.h, c:myBox.c});
or try:
或尝试：
socket.emit("message",myBox); //haven't tested it, but if it works, give plalx credit
