QR code stands for quick response, a reference to how speedily the data they contain can be decoded.

QR是快速反应的意思，意指代码中的数据能够迅速解码。

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Listing 9, a quick example from Ruby on Rails, shows a closure that is used to code the response of an HTTP request.

清单9是Ruby on Rails中的一个简短例子，清单中的闭包用于为一个HTTP请求编写响应代码。

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Since this is critical code that you'll use in some form in every Ajax application you write, take a quick tour through what a basic request/response model with Ajax looks like.

因为这段代码非常重要，您编写的每个 Ajax 应用程序都要以某种形式使用它，先看看 Ajax 的基本请求/响应模型是什么样吧。

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People waiting for trains in the subway were presented with a wall of products from the store, each with a QR code (Quick Response code) next to it.

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In the age of the QR (Quick Response) code, information from sources like mobile devices and social media, as well as all kinds of new specialized applications, is growing faster in the cloud.

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When scanned, a 1.5in (4cm) Quick Response (QR) code on the memorial launches a biography web page of the deceased on a smartphone or computer.

BBC: QR codes on headstones offered by Poole undertakers