在node.js和socket.io中发送数组时的错误 [英] Bug when sending array in node.js and socket.io

问题描述

我使用的是socket.io版本0.8.4

I use socket.io version 0.8.4

我已将问题归结为以下内容.我的数据看起来像这样:

I have boiled down my problem to the following. I have data looking like this:

data.prop1 = [];
data.prop1.push("man");
data.prop2 = [];
data.prop2["hey"] = "man";

我通过以下方式将数据从服务器发送到客户端:

I send the data from the server to the client this way:

socket.emit("data", data);

在客户端，我以这种方式接收数据:

On the client side I receive the data this way:

socket.on("data", function(data){ console.log(data); });

奇怪的是:

data.prop1 = [];
data.prop1.push("man"); // This data exists in the client side data object
data.prop2 = [];
data.prop2["hey"] = "man"; // This data does not exist.

data.prop2只是客户端上的一个空数组.

data.prop2 is just an empty array on the client side.

prop2中的表单上的json序列化数组中是否存在已知错误?

Is there a known bug in json serializing arrays on the form in prop2?

先谢谢您

使用以下变通办法解决了问题:

Problem solved using this workaround:

data.prop1 = [];
data.prop1.push("man");
data.prop2 = {}; // <= Object instead of array
data.prop2["hey"] = "man";

推荐答案

关于JSON.stringify的ECMA-262:

ECMA-262 about JSON.stringify:

数组的表示形式仅包括介于零和array.length – 1(含)之间的元素.命名属性被排除在字符串化之外.

The representation of arrays includes only the elements between zero and array.length – 1 inclusive. Named properties are excluded from the stringification.

数组应该具有数字属性名称.因此，当data.prop2转换为JSON(我想是socket.io将数据发送到其中)时，它没有获得'hey'属性.如果要使用非数字属性名称，则应使用对象而不是数组:

Arrays are supposed to have numerical property names. So when the data.prop2 is transformed to JSON (which socket.io sends the data in, I imagine), it doesn't get the 'hey' property. If you want to use non-numerical property names, you should use objects instead of arrays:

data.prop1 = [];
data.prop1.push("man");
data.prop2 = {}; // Notice we're creating an object, not an array.
data.prop2["hey"] = "man"; // Alternatively: data.prop2.hey = "man"

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