What does 'polyfill' mean？

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I ofen see polyfill words in documents. I wonder know what it points?

I quote wikipedia:

In web development, a polyfill is code that implements a feature on web browsers that do not support the feature. Most often, it refers to a JavaScript library that implements an HTML5 web standard, either an established standard (supported by some browsers) on older browsers, or a proposed standard (not supported by any browsers) on existing browsers. Formally, "a polyfill is a shim for a browser API".

As a result, polyfill is a tools supporting a no-built in feature.

It is not just belong to web browsers,more than web development.

8 replies • 2017-12-08 17:17:03 +08:00

hjdtl

Dec 7, 2017

百度了一下，感觉这个答案还不错： https://segmentfault.com/a/1190000002593432

SourceMan

Dec 7, 2017

Google 了一下，感觉这个答案还不错： https://stackoverflow.com/questions/7087331/what-is-the-meaning-of-polyfills-in-html5

kamal

Dec 7, 2017

从一楼的链接找到的 https://remysharp.com/2010/10/08/what-is-a-polyfill

serco

Dec 7, 2017

英文不忍直视啊。。。

robinlovemaggie

Dec 7, 2017

简单点说兼容新老浏览器的库就是 polyfill，否则不是。例如，jQuery 不是，Polymer, FlashCavas 是。

Mutoo

Dec 7, 2017

If you want to use an edge or modern feature on a widespread old browser (e.g. es2015 Promises), you can use the polyfill (e.g. Promises-polyfill), if the new feature is not internal provided but can be implemented within the current javascript's scope.

shanechiu

Dec 8, 2017

@Mutoo well,thanks a lot.

shanechiu

Dec 8, 2017

@hjdtl I read the article throughly, it is fully. Thank you for your recommendation.