application / x-javascript和text / javascript内容类型之间的区别 [英] Difference between application/x-javascript and text/javascript content types

问题描述

这些标题之间有什么区别？

What is the difference between these headers?

Content-Type: application/javascript
Content-Type: application/x-javascript
Content-Type: text/javascript

哪一个最好，为什么？

请不要说它们是相同的 - 如果它们相同则不会有两个相同。我知道两者都有效 - 但我想知道其中的区别。

Please do not say they are identical - if they were identical there would not have been two of them. I know both work - but I would like to know the difference.

推荐答案

text / javascript 已过时， application / x-javascript 是实验性的（因此 x - 前缀）可以标准化为 application / javascript 之前的过渡期。

text/javascript is obsolete, and application/x-javascript was experimental (hence the x- prefix) for a transitional period until application/javascript could be standardised.

您应该使用 application / javascript 。这是 RFC 。

就浏览器而言，那里没有区别（至少在HTTP标头中）。这只是一个更改，因此 text / * 和 application / * MIME类型组在可能的情况下具有一致的含义。 （ text / * MIME类型用于人类可读的内容，JavaScript不是为了直接向人类传达意义而设计的。）

As far a browsers are concerned, there is no difference (at least in HTTP headers). This was just a change so that the text/* and application/* MIME type groups had a consistent meaning where possible. (text/* MIME types are intended for human readable content, JavaScript is not designed to directly convey meaning to humans).

请注意，在脚本元素的类型属性中使用 application / javascript 将导致脚本被忽略（在一些旧版浏览器中使用未知语言）。要么继续使用 text / javascript 那么要么完全省略该属性（在HTML 5中允许）。

Note that using application/javascript in the type attribute of a script element will cause the script to be ignored (as being in an unknown language) in some older browsers. Either continue to use text/javascript there or omit the attribute entirely (which is permitted in HTML 5).

这在HTTP标头中不是问题，因为浏览器普遍（据我所知）要么完全忽略HTTP内容类型的脚本，要么现代化足以识别 application / javascript 。

This isn't a problem in HTTP headers as browsers universally (as far as I'm aware) either ignore the HTTP content-type of scripts entirely, or are modern enough to recognise application/javascript.

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