html preload和prefetch有什么区别? [英] What are the differences between html preload and prefetch?

问题描述

Preload和prefetch都用于预先请求资源，以便以后可以快速加载资源.看来我可以互换两者

Preload and prefetch are both used to request resources in advance so that later resource loading can be quick. It seems that I can interchange the two

< link rel ="preload" href ="foo.js" as ="script">

< link rel ="prefetch" href ="foo.js">

没有任何区别.

它们有什么区别?

推荐答案

Addy Osmani写道详细介绍此内容的文章，但简短的版本是:

Addy Osmani wrote an article that goes into the details of this, but the short version is:

preload是一种声明式提取，可让您强制浏览器执行以下操作:在不阻止文档加载的情况下请求资源事件.

preload is a declarative fetch, allowing you to force the browser to make a request for a resource without blocking the document’s onload event.

Prefetch向浏览器提示可能需要资源，但是代表们决定是否以及何时加载它是一个好主意浏览器.

Prefetch is a hint to the browser that a resource might be needed, but delegates deciding whether and when loading it is a good idea or not to the browser.

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