在提供 JavaScript 文件时，最好使用 application/JavaScript 或 application/x-JavaScript

整个问题符合标题。并且添加一些上下文: 我不是问什么是最好的根据什么规格说，而是什么工作最好的给予混合浏览器部署当今。

一些数据显示:

  • Google 在其主页上使用 text/javascript作为 JS。
  • Google 在 Google 文档中使用 text/javascript。
  • Google 使用 application/x-javascript为 JavaScript 文件和它们的 Ajax 库服务提供服务。
  • 雅虎使用 application/x-javascript服务他们的 JS。
  • Yahoo 使用 application/x-javascript作为其主页上的 JavaScript。
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In most situations, the mime type the server sends makes no practical difference. I would go with application/javascript, which is also recommended by an RFC.

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It has been "text/javascript" but this is obsolete (see the IANA List) and now it should be "application/javascript" (see another IANA List).

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最佳答案

According to the IETF's ECMAScript Media Types Updates as of 22 February 2021, the RFC-4329 is obsolete.

Therefore:

  • text/javascript is a recommended standard (both by IETF and by MDN)
  • application/x-javascript was experimental while deciding to move to…
  • application/javascript is obsolete
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If you choose to use application/javascript for js in your pages, IE7 and IE8 will not run your script! Blame Microsoft all you want, but if you want most people to run your pages use text/javascript.

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It used to be language="javacript". Then it changed to type="text/javascript". Now it is type="application/javacript". Ok this is getting dumb. Some of the older browsers don't recognize the new application/javascript, but still recognize the older text/javascript. I plan to continue using this, or else I'll waste hours of my time trying to change EVERY instance of text/javascript into application/javascript.
Now some day the opposite might be true. Some day the newest browsers might reject the old technique in order to be strictly standard's compliant.
But until people viewing my website start complaining that "ever since upgrading my browser, about 50% of your website disappeared", I have no motive to change the code in my website.

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Here's the 2020 answer to this question.

text/javascript is the correct JavaScript MIME type per the HTML Standard, which states:

Servers should use text/javascript for JavaScript resources. Servers should not use other JavaScript MIME types for JavaScript resources, and must not use non-JavaScript MIME types.

And also:

[…] the MIME type used to refer to JavaScript in this specification is text/javascript, since that is the most commonly used type, despite it being an officially obsoleted type according to RFC 4329.

Work is underway to reflect this reality in an RFC at the IETF level: https://datatracker.ietf.org/doc/draft-ietf-dispatch-javascript-mjs/

Any claim that "text/javascript is the obsolete one" is saying so based on RFC 4329, which both the HTML Standard and the abovementioned IETF draft (i.e. an upcoming RFC) are explicitly correcting.


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