解析JSON比解析XML更快 [英] Is parsing JSON faster than parsing XML

问题描述

我正在创建一个复杂的JavaScript库，用于处理我公司的服务器端框架。

I'm creating a sophisticated JavaScript library for working with my company's server side framework.

服务器端框架将其数据编码为简单的XML格式。没有花哨的命名空间或类似的东西。

The server side framework encodes its data to a simple XML format. There's no fancy namespacing or anything like that.

理想情况下，我想将浏览器中的所有数据解析为JSON。但是，如果我这样做，我需要重写一些服务器端代码以吐出JSON。这很痛苦，因为我们有公共API，我无法轻易改变。

Ideally I'd like to parse all of the data in the browser as JSON. However, if I do this I need to rewrite some of the server side code to also spit out JSON. This is a pain because we have public APIs that I can't easily change.

我真正关心的是在解析JSON与XML的浏览器中的性能。关注真的有很大的不同吗？或者我应该专门去寻找JSON？有没有人对两者之间的性能差异有任何经验或基准？

What I'm really concerned about here is performance in the browser of parsing JSON versus XML. Is there really a big difference to be concerned about? Or should I exclusively go for JSON? Does anyone have any experience or benchmarks in the performance difference between the two?

我意识到大多数现代Web开发人员可能会选择JSON，我可以理解为什么。但是，我真的只对表现感兴趣。如果已经证明存在巨大差异，那么我准备花费额外的精力为客户端生成JSON服务器端。

I realize that most modern web developers would probably opt for JSON and I can see why. However, I really am just interested in performance. If there's a proven massive difference then I'm prepared to spend the extra effort in generating JSON server side for the client.

推荐答案

JSON应该更快，因为它是 JS 对象表示法，这意味着它可以被JavaScript本地识别。在GET方面的PHP中，我经常会这样做：

JSON should be faster since it's JS Object Notation, which means it can be recognized natively by JavaScript. In PHP on the GET side of things, I will often do something like this:

<script type="text/javascript">
    var data = <?php json_encode($data)?>;
</script>

有关详细信息，请参阅此处：

For more information on this, see here:

为什么每个人都为jQuery选择基于XML的JSON？

另外......你真正需要在生成JSON中加入什么额外的努力？当然你不能说你将手动构建JSON字符串？几乎每种现代服务器端语言都有将原始变量转换为JSON字符串的库。例如，PHP的核心 json_encode 函数会转换一个关联数组，如下所示：

Also...what "extra effort" do you really have to put into "generating" JSON? Surely you can't be saying that you'll be manually building the JSON string? Almost every modern server-side language has libraries that convert native variables into JSON strings. For example, PHP's core json_encode function converts an associative array like this:

$data = array('test'=>'val', 'foo'=>'bar');

进入

{"test": "val", "foo": "bar"}

这只是一个JavaScript对象（因为JS中没有关联数组（严格来说））。

Which is simply a JavaScript object (since there are no associative arrays (strictly speaking) in JS).

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