这是一个创建于 3061 天前的主题，其中的信息可能已经有所发展或是发生改变。
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.
 | 1 hjdtl 2017 年 12 月 7 日 百度了一下，感觉这个答案还不错： https://segmentfault.com/a/1190000002593432 |
 | 2 SourceMan 2017 年 12 月 7 日 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 |
 | 3 kamal 2017 年 12 月 7 日 |
 | 4 serco 2017 年 12 月 7 日 英文不忍直视啊。。。 |
 | 5 robinlovemaggie 2017 年 12 月 7 日 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。 |
 | 6 Mutoo 2017 年 12 月 7 日 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. |
 | 8 shanechiu OP @hjdtl I read the article throughly, it is fully. Thank you for your recommendation. |
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