What is JSON?
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Why does JSON matter?
How do we use JSON in a project?
We'll also use our newfound skills with JSON at the end of
this project to build a quick app that loads photos from Flickr without
requiring a page refresh.
What Is JSON?
JSON is short for JavaScript Object Notation, and is a way to store information in
an organized, easy-to-access manner. In a nutshell, it gives us a
human-readable collection of data that we can access in a really logical
manner.
Why Does JSON Matter?
With the rise of AJAX-powered sites, it's
becoming more and more important for sites to be able to load data quickly and asynchronously,
or in the background without delaying page rendering. Switching up the contents
of a certain element within our layouts without requiring a page refresh adds a
"wow" factor to our applications, not to mention the added
convenience for our users. Because of the popularity and ease of social media,
many sites rely on the content provided by sites such as Twitter, Flickr, and
others. These sites provide RSS feeds, which are easy to import and use on the
server-side, but if we try to load them with AJAX, we run into a wall: we can
only load an RSS feed if we're requesting it from the same domain it's hosted
on.
JSON allows us to overcome the cross-domain issue because we
can use a method called JSONPthat uses a callback function to send the JSON data back to our domain. It's
this capability that makes JSON so incredibly useful, as it opens up a lot of
doors that were previously difficult to work around.
http://www.copterlabs.com/json-what-it-is-how-it-works-how-to-use-it/
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名称栏目：认识JSON-创新互联
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